COLUMBIA BANKING SYSTEM, INC., 10-K filed on 2/29/2016
Annual Report
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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2015
Jan. 31, 2016
Jun. 30, 2015
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Entity Registrant Name COLUMBIA BANKING SYSTEM INC    
Entity Central Index Key 0000887343    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   57,744,431  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 1,856,086,644
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Consolidated Balance Sheets - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
ASSETS    
Cash and due from banks $ 166,929 $ 171,221
Interest-earning deposits with banks 8,373 16,949
Total cash and cash equivalents 175,302 188,170
Securities available for sale at fair value (amortized cost of $2,157,610 and $2,087,069, respectively) 2,157,694 2,098,257
Federal Home Loan Bank stock at cost 12,722 33,365
Loans held for sale 4,509 1,116
Loans, net of unearned income of ($42,373) and ($59,374), respectively 5,815,027 5,445,378
Loans and Leases Receivable, Allowance 68,172 69,569
Loans, net 5,746,855 5,375,809
FDIC Indemnification Asset 6,568 15,174
Interest receivable 27,877 27,802
Premises and equipment, net 164,239 172,090
Other real estate owned 13,738 22,190
Goodwill 382,762 382,537
Core deposit intangible, net 23,577 30,459
Other assets 235,854 231,877
Total Assets 8,951,697 8,578,846
LIABILITIES AND SHAREHOLDERS' EQUITY    
Noninterest-bearing 3,507,358 2,651,373
Interest-bearing 3,931,471 4,273,349
Total deposits 7,438,829 6,924,722
Federal Home Loan Bank advances 68,531 216,568
Securities sold under agreements to repurchase 99,699 105,080
Other borrowings 0 8,248
Other liabilities 102,510 96,053
Total liabilities $ 7,709,569 $ 7,350,671
Commitments and contingent liabilities
Preferred Stock, Shares Authorized 2,000 2,000
Preferred Stock, Shares Issued 9 9
Preferred Stock, Value, Issued $ 2,217 $ 2,217
Shareholders' equity:    
Authorized shares 115,000 63,033
Common Stock Shares Issued And Outstanding 57,724 57,437
Common Stock (no par value) $ 990,281 $ 985,839
Retained earnings 255,925 234,498
Accumulated Other Comprehensive Income (Loss), Net of Tax (6,295) 5,621
Total shareholders' equity 1,242,128 1,228,175
Total Liabilities and Shareholders' Equity $ 8,951,697 $ 8,578,846
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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ / shares in Thousands, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Securities available-for-sale, amortized cost $ 2,157,610 $ 2,087,069
Unearned income on loans $ (42,373) $ (59,374)
Common stock, par value $ 0 $ 0
Common stock, shares authorized 115,000 63,033
Common stock, outstanding 57,724 57,437
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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest Income      
Loans $ 286,166 $ 268,279 $ 266,284
Taxable securities 30,774 28,754 20,459
Tax-exempt securities 11,842 10,830 9,837
Interest-earning deposits 109 179 355
Total interest income 328,891 308,042 296,935
Interest Expense      
Deposits 2,977 3,005 3,962
Federal Home Loan Bank and Federal Reserve Bank borrowings 474 396 (404)
Prepayment charge on Federal Home Loan Bank advances 0 0 1,548
Other borrowings 553 593 734
Total interest expense 4,004 3,994 5,840
Net Interest Income 324,887 304,048 291,095
Provision (recapture) for loan and lease losses 8,591 6,727 (101)
Net interest income after provision (recapture) for loan and lease losses 316,296 297,321 291,196
Noninterest Income (Loss)      
Service charges and other fees 61,881 55,555 48,351
Merchant services fees 8,975 7,975 8,812
Gain on sale of investment securities, net 1,581 552 462
Bank owned life insurance 4,441 3,823 3,570
Change in FDIC loss sharing asset (4,010) (19,989) (45,017)
Other 18,605 11,834 10,522
Total noninterest income (loss) 91,473 59,750 26,700
Noninterest Expense      
Compensation and employee benefits 149,410 130,864 125,432
Occupancy 34,818 32,300 33,054
Merchant processing 4,204 4,006 3,551
Advertising and promotion 4,713 3,964 4,090
Data processing 17,421 15,369 14,076
Legal and professional fees 9,608 11,389 12,338
Taxes, licenses and fees 5,395 4,552 5,033
Regulatory premiums 4,806 4,549 4,706
Net cost (benefit) of operation of other real estate owned (1,629) (1,045) (7,401)
Amortization of intangibles 6,882 6,293 6,045
Other 30,521 27,045 29,962
Total noninterest expense 266,149 239,286 230,886
Income before income taxes 141,620 117,785 87,010
Provision for income taxes 42,793 36,211 26,994
Net Income $ 98,827 $ 81,574 $ 60,016
Per Common Share      
Basic earnings per common share $ 1.71 $ 1.53 $ 1.24
Diluted earnings per common share $ 1.71 $ 1.52 $ 1.21
Weighted average number of common shares outstanding 57,019 52,618 47,993
Weighted average number of diluted common shares outstanding 57,032 53,183 49,051
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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 98,827 $ 81,574 $ 60,016
Unrealized gain from securities:      
Net unrealized holding gain (loss) from available for sale securities arising during the period, net of tax of $3,455, ($10,200) and $17,498 (6,069) 17,922 (30,727)
Reclassification adjustment of net gain from sale of available for sale securities included in income, net of tax of $574, $200 and $163 (1,007) (352) (299)
Net unrealized gain (loss) from securities, net of reclassification adjustment (7,076) 17,570 (31,026)
Pension plan liability adjustment:      
Unrecognized net actuarial loss and plan amendments during the period, net of tax of $2,878, $0 and $780 (5,054) 0 (1,432)
Less: amortization of unrecognized net actuarial losses included in net periodic pension cost, net of tax of ($122), ($54) and ($135) 214 95 265
Pension plan liability adjustment, net (4,840) 95 (1,167)
Other comprehensive income (loss) (11,916) 17,665 (32,193)
Comprehensive income $ 86,911 $ 99,239 $ 27,823
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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net unrealized holding gain from available for sale securities arising during the period, tax $ (3,455) $ 10,200 $ (17,498)
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax 574 200 163
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax 2,878 0 780
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax $ (122) $ (54) $ (135)
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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Balance, value at Dec. 31, 2012 $ 764,008 $ 0 $ 581,471 $ 162,388 $ 20,149
Balance (in shares) at Dec. 31, 2012   0 39,686,000    
Net income 60,016     60,016  
Other comprehensive income (32,193)       (32,193)
Issuance of common stock, net of offering costs, shares   9,000 11,380,000    
Issuance of common stock, net of offering costs, value 276,181 $ 2,217 $ 273,964    
Stock Adjustment Value Deferred Compensation 517        
Issuance of common stock - stock option and other plans, shares     73,000    
Issuance of common stock - stock option and other plans, value 1,243   $ 1,243    
Issuance of common stock - restricted stock awards, net of canceled awards, shares     144,000    
Issuance of common stock - restricted stock awards, net of canceled awards, value 2,693   $ 2,693    
Tax benefit deficiency associated with share-based compensation     $ 1,103    
Purchase and retirement of common stock (in shares)     (18,000)    
Purchase and retirement of common stock, value (429)   $ (429)    
Dividends, Preferred Stock       0  
Dividends, Preferred Stock, Cash (32)        
Cash dividends paid on common stock (19,858)     (19,858)  
Balance, value at Dec. 31, 2013 $ 1,053,249 $ 2,217 $ 860,562 202,514 (12,044)
Balance (in shares) at Dec. 31, 2013   9,000 51,265,000    
Preferred Stock, Dividends, Per Share, Cash Paid $ 0.31        
Common Stock, Dividends, Per Share, Cash Paid $ 0.41        
Net income $ 81,574     81,574  
Other comprehensive income 17,665       17,665
Issuance of common stock, net of offering costs, shares   0 4,208,000    
Issuance of common stock, net of offering costs, value 116,907 $ 0 $ 116,907    
Stock Issued During Period, Shares, Conversion of Warrants     1,722,000    
Stock Issued During Period, Value, Conversion of Warrants     $ 5,000    
Stock Adjustment Value Deferred Compensation (1)        
Issuance of common stock - stock option and other plans, shares     41,000    
Issuance of common stock - stock option and other plans, value 929   $ 929    
Issuance of common stock - restricted stock awards, net of canceled awards, shares     225,000    
Issuance of common stock - restricted stock awards, net of canceled awards, value 2,859   $ 2,859    
Tax benefit deficiency associated with share-based compensation 205   $ 205    
Purchase and retirement of common stock (in shares)     (24,000)    
Purchase and retirement of common stock, value (622)   $ (622)    
Dividends, Preferred Stock, Cash (96)        
Cash dividends paid on common stock (49,494)     (49,494)  
Balance, value at Dec. 31, 2014 $ 1,228,175 $ 2,217 $ 985,839 234,498 5,621
Balance (in shares) at Dec. 31, 2014   9,000 57,437,000    
Preferred Stock, Dividends, Per Share, Cash Paid $ 0.94        
Common Stock, Dividends, Per Share, Cash Paid $ 0.94        
Net income $ 98,827     98,827  
Other comprehensive income $ (11,916)       (11,916)
Issuance of common stock - stock option and other plans, shares 7,898   49,000    
Issuance of common stock - stock option and other plans, value $ 1,258   $ 1,258    
Issuance of common stock - restricted stock awards, net of canceled awards, shares     270,000    
Issuance of common stock - restricted stock awards, net of canceled awards, value 4,090   $ 4,090    
Purchase and retirement of common stock (in shares)     (32,000)    
Purchase and retirement of common stock, value (906)   $ (906)    
Dividends, Preferred Stock, Cash (137)        
Cash dividends paid on common stock (77,263)     (77,263)  
Balance, value at Dec. 31, 2015 $ 1,242,128 $ 2,217 $ 990,281 $ 255,925 $ (6,295)
Balance (in shares) at Dec. 31, 2015   9,000 57,724,000    
Preferred Stock, Dividends, Per Share, Cash Paid $ 1.34        
Common Stock, Dividends, Per Share, Cash Paid $ 1.34        
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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows From Operating Activities      
Net Income (Loss) $ 98,827 $ 81,574 $ 60,016
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision (recapture) for loan and lease losses 8,591 6,727 (101)
Stock-based compensation expense 4,090 2,859 2,844
Depreciation, amortization and accretion 30,312 44,459 40,431
Investment securities gain, net (1,581) (552) (462)
Net realized (gain) loss on sale of other assets 573 564 (48)
Net gain on sale and valuation adjustments of OREO 2,152 1,870 8,504
Net realized gain on sale of branches 0 (565) 0
Originations of loans held for sale (75,689) (23,344) (43,046)
Proceeds from Sale of Loans Held-for-sale 72,296 23,573 44,874
Deferred income tax expense (benefit) 6,367 14,646 5,413
Net change in:      
Interest receivable (75) (944) (7,938)
Interest payable (142) 89 (122)
Other assets (5,419) (4,479) (3,385)
Other liabilities (1,242) (5,119) (10,336)
Net cash provided by operating activities 134,756 137,618 79,636
Cash Flows From Investing Activities      
Payments for (Proceeds from) Loans and Leases (384,321) (440,376) (161,827)
Purchases of securities available for sale (467,631) (363,693) (457,985)
Purchases of premises and equipment (7,581) (12,485) (13,133)
Payments to Acquire Federal Home Loan Bank Stock (16,760) 0 0
Proceeds from FDIC for reimbursement on loss-sharing asset 4,659 5,950 9,246
Proceeds from sales of securities available for sale 95,375 63,292 166,881
Proceeds from principal repayments and maturities of securities available for sale 283,206 180,648 293,940
Proceeds from sales of loans held for investment and other assets 15,074 2,840 2,917
Proceeds from Sale of Federal Home Loan Bank Stock 37,403 1,288 1,114
Proceeds from sales of other real estate and other personal property owned 19,387 28,559 36,453
Payment to FDIC Related to Loss-Sharing Asset (1,865) (3,451) 0
Capital improvements on other real estate properties 0 0 (3,577)
Payments to Acquire Intangible Assets 0 0 (919)
Net cash paid in branch sale 0 (16,788) 0
Net cash received (paid) in business combinations 0 32,255 (154,170)
Net cash used in investing activities (423,054) (521,961) (281,060)
Cash Flows From Financing Activities      
Net increase (decrease) in deposits 514,107 250,629 33,983
Net increase (decrease) in repurchase agreements (5,381) 21,037 0
Proceeds from exercise of stock options 1,258 929 1,092
Proceeds from Warrant Exercises 0 5,000 0
Proceeds from Federal Home Loan Bank advances 1,702,000 1,602,000 1,215,100
Proceeds from Federal Reserve Bank borrowings 1,010 800 50
Repayment of Federal Home Loan Bank advances (1,850,000) (1,422,000) (1,313,000)
Repayment of Federal Reserve Bank borrowings (1,010) (800) (50)
Payment of preferred stock dividends (137) (96) (32)
Payment of common stock dividends (77,263) (49,494) (19,858)
Repayment of other borrowings (8,248) (14,636) (51,000)
Purchase and retirement of common stock (906) (622) (429)
Proceeds from excess tax benefit from stock-based compensation 0 (205) (1,203)
Net cash provided by (used in) financing activities 275,430 392,952 (132,941)
Increase (decrease) in cash and cash equivalents (12,868) 8,609 (334,365)
Cash and cash equivalents at beginning of period 188,170 179,561 513,926
Supplemental Information:      
Cash paid for interest 4,146 3,904 5,962
Cash paid for income tax 30,522 21,230 26,754
Non-cash investing and financing activities      
Loans transferred to other real estate owned 8,688 10,200 18,100
Share-based consideration issued in business combinations $ 0 $ 116,907 $ 276,181
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Summary of Significant Accounting Policies
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies
Organization
Columbia Banking System, Inc. (the “Corporation”, “we”, “our”, “Columbia” or the “Company”) is the holding company for Columbia State Bank (“Columbia Bank” or the “Bank”) and West Coast Trust Company, Inc. (“West Coast Trust”). The Bank provides a full range of financial services through 149 branch locations, including 74 in the State of Washington, 59 in Oregon and 16 in Idaho. West Coast Trust provides fiduciary, agency, trust and related services, and life insurance products. Because the Bank comprises substantially all of the business of the Corporation, references to the “Company” mean the Corporation, the Bank and West Coast Trust together. The Corporation is approved as a bank holding company pursuant to the Gramm-Leach-Bliley Act of 1999.
The Company’s accounting and reporting policies conform to accounting principles generally accepted in the United States of America (“GAAP”) and practices in the financial services industry. To prepare the financial statements in conformity with GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, and income and expenses during the reporting period. Circumstances and events that differ significantly from those underlying our estimates and assumptions could cause actual financial results to differ from our estimates. The most significant estimates included in the financial statements relate to the allowance for loan and lease losses, business combinations, purchased credit impaired loans, Federal Deposit Insurance Corporation (“FDIC”) loss-sharing asset and goodwill impairment.
The Company has applied its accounting policies and estimation methods consistently in all periods presented in these financial statements (to the periods in which they applied).
Consolidation
The consolidated financial statements of the Company include the accounts of the Corporation and its subsidiaries, including the Bank and West Coast Trust. Intercompany balances and transactions have been eliminated in consolidation.
Cash and cash equivalents
Cash and cash equivalents include cash and due from banks, and interest bearing balances due from correspondent banks and the Federal Reserve Bank. Cash equivalents have a maturity of 90 days or less at the time of purchase.
Securities
Securities are classified based on management’s intention on the date of purchase. All securities are classified as available for sale and are presented at fair value. Unrealized gains or losses on securities available for sale are excluded from net income but are included as separate components of other comprehensive income, net of taxes. Purchase premiums or discounts on securities available for sale are amortized or accreted into income using the interest method over the terms of the individual securities. The Company performs a quarterly assessment to determine whether a decline in fair value below amortized cost is other-than-temporary. Amortized cost includes adjustments made to the cost of an investment for accretion, amortization, collection of cash and previous other-than temporary impairment recognized in earnings. Other-than-temporary impairment exists when it is probable that the Company will be unable to recover the entire amortized cost basis of the security.
In performing the quarterly assessment for debt securities, management considers whether or not the Company expects to recover the entire amortized cost basis of the security. In addition, management also considers whether it is more likely than not that it will not have to sell the security before recovery of its cost basis. If the Company intends to sell a security or it is more likely than not it will be required to sell a security prior to recovery of its cost basis, the entire amount of impairment is recognized in earnings. If the Company does not intend to sell the security or it is not more likely than not it will be required to sell the security prior to recovery of its cost basis, the credit loss component of impairment is recognized in earnings and impairment associated with non-credit factors, such as market liquidity, is recognized in other comprehensive income net of tax. A credit loss is the difference between the cost basis of the security and the present value of cash flows expected to be collected, discounted at the security’s effective interest rate at the date of acquisition. The cost basis of an other-than-temporarily impaired security is written down by the amount of impairment recognized in earnings. The new cost basis is not adjusted for subsequent recoveries in fair value. However, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as interest income. The total other-than-temporary impairment, if any, is presented in the consolidated statements of income with a reduction for the amount of other-than-temporary impairment that is recognized in other comprehensive income, if any.
Realized gains or losses on sales of securities available for sale are recorded using the specific identification method.
Federal Home Loan Bank Stock
Effective May 31, 2015, the Federal Home Loan Bank of Des Moines (the “FHLB Des Moines”) completed its merger with the Federal Home Loan Bank of Seattle (the “FHLB Seattle”). At closing, the FHLB Seattle merged with and into the FHLB Des Moines, with the FHLB Des Moines surviving the merger as the continuing bank. Also at closing, the Company, a member of the FHLB Seattle, automatically became a member of the FHLB Des Moines. Pursuant to the terms of the merger, each share of the Company’s FHLB Seattle Class B stock was converted into one share of FHLB Des Moines Class B stock.

FHLB Des Moines Class B stock is composed of two sub-classes: membership stock and activity based stock. Membership stock is stock we are required to purchase and hold as a condition of membership in the FHLB Des Moines. The Company’s membership stock purchase requirement is measured as a percentage of our year-end assets, subject to a $10 million cap. Activity based stock is stock we are required to purchase and hold in order to obtain an advance or participate in FHLB Des Moines mortgage programs. Class B stock may be redeemed, subject to certain limitations, on five years’ written notice to the FHLB Des Moines. FHLB Des Moines capital stock is carried at par value because the shares are issued, transferred, redeemed, and repurchased by the FHLB Des Moines at a par value of $100. FHLB Des Moines capital stock is subject to recoverability testing per the Financial Services-Depository and Lending topic of the FASB Accounting Standards Codification (“ASC”).
Loans
Loans, excluding purchased credit impaired loans are generally carried at the unpaid principal balance, net of premiums, discounts and net deferred loan fees. Net deferred loan fees include nonrefundable loan origination fees less direct loan origination costs. Net deferred loan fees, premiums and discounts are amortized into interest income using either the interest method or straight-line method over the terms of the loans, adjusted for actual prepayments. The amortization is calculated using the interest method for all loans except revolving loans, for which the straight-line method is used. Interest income is accrued as earned. Fees related to lending activities other than the origination or purchase of loans are recognized as noninterest income during the period the related services are performed.
Nonaccrual loans—Loans are placed on nonaccrual status when a loan becomes contractually past due 90 days with respect to interest or principal unless the loan is both well secured and in the process of collection, or if full collection of interest or principal becomes uncertain. When a loan is placed on nonaccrual status, any accrued and unpaid interest receivable is reversed and the amortization of net deferred loan fees, premiums and discounts ceases. Thereafter, interest collected on the loan is accounted for on the cash collection or cost recovery method until qualifying for return to accrual status. Generally, a loan may be returned to accrual status when the delinquent principal and interest are brought current in accordance with the terms of the loan agreement for a minimum period of six months and future payments are reasonably assured.
Impaired loans—Loans are considered impaired when based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or when a loan has been modified in a troubled debt restructuring. The assessment for impairment occurs when and while such loans are designated as classified per the Company’s internal risk rating system or when and while such loans are on nonaccrual. All nonaccrual loans greater than $500,000 and all troubled debt restructured loans are considered impaired and analyzed individually on a quarterly basis. Classified loans with an outstanding balance greater than $500,000 are evaluated for potential impairment on a quarterly basis.
When a loan with unique risk characteristics has been identified as being impaired, the amount of impairment will be measured by the Company using discounted cash flows, except when it is determined that the remaining source of repayment for the loan is the operation or liquidation of the underlying collateral. In these cases, the current fair value of the collateral, reduced by costs to sell, will be used in place of discounted cash flows. As a final alternative, the observable market price of the debt may be used to assess impairment. Predominantly, the Company uses the fair value of collateral approach based upon a reliable valuation.
When the measurement of the impaired loan is less than the recorded amount of the loan, an impairment is recognized by recording a charge-off to the allowance for loan and lease losses or by designating a specific reserve. The Company’s policy is to record cash receipts received on impaired loans first as reductions to principal and then to interest income.
Restructured Loans—A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that lead to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include interest rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses. Generally, a nonaccrual loan that is restructured remains on nonaccrual status for a period of six months to demonstrate that the borrower can meet the restructured terms. If the borrower’s performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan.
Purchased Credit Impaired Loans (“PCI Loans”)—Loans acquired with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are accounted for under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. In addition, because of the significant discounts associated with certain of the acquired loan portfolios, the Company elected to account for those certain acquired loans under ASC 310-30.
In situations where such loans have similar risk characteristics, loans are aggregated into pools to estimate cash flows. A pool is accounted for as a single asset with a single interest rate, cumulative loss rate and cash flow expectation. Expected cash flows at the acquisition date in excess of the fair value of loans are considered to be accretable yield, which is recognized as interest income over the life of the loan pool using a level yield method if the timing and amount of the future cash flows of the pool is reasonably estimable. Subsequent to the acquisition date, any increases in cash flow over those expected at purchase date in excess of fair value are recorded as interest income prospectively. Any subsequent decreases in cash flow over those expected at purchase date due to credit deterioration are recognized by recording an allowance for losses on purchased credit impaired loans. Any disposals of loans, including sales of loans, payments in full or foreclosures result in the removal of the loan from the loan pool at the carrying amount.
Unfunded loan commitments—Unfunded commitments are generally related to providing credit facilities to clients of the Bank and are not actively traded financial instruments. These unfunded commitments are disclosed as financial instruments with off-balance sheet risk in Note 17 in the Notes to Consolidated Financial Statements.
Allowance for Loan and Lease Losses
The Company accounts for the credit risk associated with lending activities through its allowance for loan and lease losses and provision for loan and lease losses. The provision is the expense recognized in the consolidated statements of income to adjust the allowance to the levels deemed appropriate by management, as determined through application of the Company’s allowance methodology procedures. The provision for loan and lease losses reflects management’s judgment of the adequacy of the allowance for loan and lease losses. Loan and lease losses are charged against the allowance when management believes the collectability of a loan balance is unlikely. Subsequent recoveries, if any, are credited to the allowance.
The allowance for loan and lease losses is evaluated on a regular basis by management and is based upon management’s periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, and estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.
The allowance consists of general, specific, and unallocated components. The general component covers loans not specifically measured for impairment and is based on historical loss experience adjusted for qualitative factors. The specific component relates to loans that are impaired. For impaired loans an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The unallocated allowance provides for other credit losses inherent in the Company’s loan portfolio that may not have been contemplated in the general and specific components of the allowance. This unallocated amount generally comprises less than 5% of the allowance. The unallocated amount is reviewed periodically based on trends in credit losses, the results of credit reviews and overall economic trends.
Allowance for Loan Losses on Purchased Credit Impaired Loans
The Company updates its cash flow projections for purchased credit impaired loans accounted for under ASC 310-30 on a quarterly basis. Assumptions utilized in this process include projections related to probability of default, loss severity, prepayment and recovery lag. Projections related to probability of default and prepayment are calculated utilizing a loan migration analysis. The loan migration analysis is a matrix of probability that is used to estimate the probability of a loan pool transitioning into a particular delinquency state given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages, and recovery lags are based upon the collateral within the loan pools.
Any decreases in expected cash flows after the acquisition date and subsequent measurement periods are recognized by recording a provision for loan losses. See Purchased Credit Impaired Loans for further discussion.
Allowance for Unfunded Commitments and Letters of Credit
The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to these unfunded credit facilities. The determination of the adequacy of the allowance is based on periodic evaluations of the unfunded credit facilities including an assessment of the probability of commitment usage, credit risk factors for loans outstanding to these same customers, and the terms and expiration dates of the unfunded credit facilities. The allowance for unfunded commitments is included in other liabilities on the consolidated balance sheets, with changes to the balance charged against noninterest expense.
Premises and Equipment
Land, buildings, leasehold improvements and equipment are stated at cost less accumulated depreciation and amortization. Gains or losses on dispositions are reflected in current operations. Expenditures for improvements and major renewals are capitalized, and ordinary maintenance, repairs and small purchases are charged to operating expenses. Depreciation and amortization are computed based on the straight-line method over the estimated useful lives of the various classes of assets. The ranges of useful lives for the principal classes of assets are as follows:
Buildings and building improvements
5 to 39 years
Leasehold improvements
Term of lease or useful life, whichever is shorter
Furniture, fixtures and equipment
3 to 7 years
Vehicles
5 years
Computer software
3 to 5 years

Software
Capitalized software is stated at cost, less accumulated amortization. Amortization is computed on a straight-line basis and charged to expense over the estimated useful life of the software, which is generally three years. Capitalized software is included in Premises and equipment, net in the consolidated balance sheets.
Other Real Estate Owned (“OREO”)
OREO is composed of real estate acquired in satisfaction of loans. Properties acquired by foreclosure or deed in lieu of foreclosure are transferred to OREO and are recorded at fair value less estimated costs to sell at the date of transfer of the property. The fair value of the OREO property is based upon current appraisal. If the carrying value exceeds the fair value at the time of the transfer, the difference is charged to the allowance for loan and lease losses. Losses that result from the ongoing periodic valuation of these properties are charged to the net cost of operation of OREO in the period in which they are identified. Improvements to the OREO are capitalized and holding costs are charged to the net cost of operation of OREO as incurred.
FDIC Loss-sharing Asset
The acquisition date fair value of the reimbursement the Company expected to receive from the FDIC under loss-sharing agreements was recorded in the FDIC loss-sharing asset on the consolidated balance sheet. Subsequent to initial recognition, the FDIC loss-sharing asset is reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments are measured on the same basis as the related covered assets. Any decrease in expected cash flows for the covered assets due to an increase in expected credit losses will increase the FDIC loss-sharing asset and any increase in expected future cash flows for the covered assets due to a decrease in expected credit losses will decrease the FDIC loss-sharing asset. Changes in the estimated cash flows on covered assets that are immediately recognized in income generally result in a similar immediate adjustment to the loss-sharing asset while changes in expected cash flows on covered assets that are accounted for as an adjustment to yield generally result in adjustments to the amortization or accretion rate for the loss-sharing asset. Increases and decreases to the FDIC loss-sharing asset are recorded as adjustments to noninterest income.
Goodwill and Intangibles
Net assets of companies acquired in purchase transactions are recorded at fair value at the date of acquisition. Identified intangibles are amortized on an accelerated basis over the period benefited. Goodwill is not amortized but is reviewed for potential impairment during the third quarter on an annual basis or, more frequently, if events or circumstances indicate a potential impairment, at the reporting unit level. A reporting unit is an operating segment or one level below an operating segment for which discrete financial information is available and regularly reviewed by management. The Company consists of a single reporting unit. If the fair value of the reporting unit, including goodwill, is determined to be less than the carrying amount of the reporting unit, a further test is required to measure the amount of impairment. If an impairment loss exists, the carrying amount of goodwill is adjusted to a new cost basis. Subsequent reversal of a previously recognized goodwill impairment loss is prohibited.
Intangible assets are evaluated for impairment if events and circumstances indicate a possible impairment. Such evaluation of other intangible assets is based on undiscounted cash flow projections. At December 31, 2015, intangible assets included on the consolidated balance sheets principally consists of a core deposit intangible amortized using an accelerated method with an original estimated life of 10 years.
Income Taxes
The provision for income taxes includes current and deferred income tax expense on net income adjusted for temporary and permanent differences such as interest income on state and municipal securities and investments in affordable housing credits. Deferred tax assets and liabilities are recognized for the expected future tax consequences of existing temporary differences between the financial reporting and tax reporting basis of assets and liabilities using enacted tax laws and rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. On a quarterly basis, management evaluates deferred tax assets to determine if these tax benefits are expected to be realized in future periods. This determination is based on facts and circumstances, including the Company’s current and future tax outlook. To the extent a deferred tax asset is no longer considered “more likely than not” to be realized, a valuation allowance is established.
We recognize the tax benefit from uncertain tax positions only if it is more likely than not that the tax positions will be sustained on examination by the tax authorities, based on the technical merits of the position. The tax benefit is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. We recognize interest and penalties related to unrecognized tax benefits in “Provision for income taxes” in the consolidated statements of income.
Advertising
Advertising costs are generally expensed as incurred.
Earnings per Common Share
The Company’s capital structure includes convertible preferred shares, common shares, restricted common shares, common share options, and during portions of 2014 and 2013, warrants to purchase common shares. Restricted common shares participate in dividends declared on common shares at the same rate as common shares. Convertible preferred shares participate in dividends declared on common shares on an “as if converted” basis. Accordingly, the Company calculates earnings per common share (“EPS”) using the two-class method under the Earnings per Share topic of the FASB ASC. The two-class method is an earnings allocation formula that treats a participating security as having rights to earnings that otherwise would have been available to common shareholders but does not require the presentation of basic and diluted EPS for securities other than common shares.
Under the two-class method, basic EPS is computed by dividing earnings allocated to common shareholders by the weighted average number of common shares outstanding for the period. Earnings allocated to common shareholders represents net income reduced by earnings allocated to participating securities. Participating securities include nonvested restricted stock awards and preferred stock. Diluted EPS is computed in the same manner as basic earnings per share except that the denominator is increased to include the number of additional common shares that would have been outstanding if certain shares issuable upon exercise of options and warrants were included unless those additional shares would have been anti-dilutive. For the diluted EPS computation, the treasury stock method is applied and compared to the two-class method and whichever method results in a more dilutive impact is utilized to calculate diluted EPS.
Share-Based Payment
The Company accounts for stock options and stock awards in accordance with the Compensation—Stock Compensation topic of the FASB ASC. Authoritative guidance requires the Company to measure the cost of employee services received in exchange for an award of equity instruments, such as stock options or stock awards, based on the fair value of the award on the grant date. This cost must be recognized in the consolidated statements of income over the vesting period of the award.
The Company issues restricted stock awards which generally vest over a four- or five-year period during which time the holder receives dividends and has full voting rights. Restricted stock is valued at the closing price of the Company’s stock on the date of an award.
Derivatives and Hedging Activities
In accordance with the Derivatives and Hedging topic of the FASB ASC, the Company recognizes derivatives as assets or liabilities on the consolidated balance sheets at their fair value. The Company periodically enters into interest rate contracts with customers and offsetting contracts with third parties. As these interest rate contracts are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the changes in fair value of these instruments are recognized immediately in earnings.
Accounting Pronouncements
During the year ended December 31, 2015, the following Accounting Standards Updates were issued or became effective:
In September 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. The amendments in ASU 2015-16 require that the acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amount is determined. The acquirer is required to also record, in the same period’s financial statements, the effect on earnings as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. In addition, an entity is required to present separately on the face of the income statement or disclose in the notes to the financial statements the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. The amendments in ASU 2015-16 are effective for years beginning after December 15, 2015. Early adoption is permitted for reporting periods for which financial statements have not been issued. The Company early adopted the amendments in ASU 2015-16 in 2015. Adoption of this ASU did not have a material impact on the Company's consolidated financial statements.
In June 2014, the FASB issued ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in ASU 2014-11 change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with accounting for other repurchase agreements. Additionally, the amendment requires new disclosures on transfers accounted for as sales in transactions that are economically similar to repurchase agreements and requires increased transparency on collateral pledged in secured borrowings. The amendments in this update were effective for the first interim or annual period beginning after December 31, 2014, with the exception of the collateral disclosures which were effective for interim periods beginning after March 15, 2015. Adoption of this ASU did not have a material impact on the Company's consolidated financial statements.
In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers. The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update was to be effective for interim and annual periods beginning after December 15, 2016. However, in August 2015, the FASB issued ASU 2015-14, which delayed the effective date of ASU 2014-09 by one year and permits companies to voluntarily adopt the new standard as of the original effective date. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements.
In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. It is effective for annual periods beginning on or after December 15, 2014. Adoption of this ASU did not have a material impact on the Company's consolidated financial statements.
In January 2014, the FASB issued ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure. The update clarifies when a creditor would be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that all or a portion of the loan would be derecognized and the real estate property recognized. Under the guidance, a consumer loan collateralized by residential real estate should be reclassified to other real estate owned when (1) the creditor obtains legal title to the residential property or (2) the borrower conveys all interest in the property to the creditor to satisfy the loan by completing a deed in lieu of foreclosure or similar agreement. In addition, an entity is required to disclose the amount of residential real estate meeting the conditions above and the recorded investment in consumer mortgage loans secured by residential real estate that are in the process of foreclosure. ASU 2014-04 was effective for annual and interim reporting periods within those annual periods, beginning after December 15, 2014. Adoption of this ASU did not have a material impact on the Company's consolidated financial statements.
v3.3.1.900
Business Combinations
 12 Months Ended
Dec. 31, 2015
Business Acquisition [Line Items]  
Business Combination Disclosure [Text Block]
Business Combinations
Intermountain Community Bancorp
On November 1, 2014, the Company completed its acquisition of Intermountain Community Bancorp (“Intermountain”) and its wholly-owned banking subsidiary Panhandle State Bank. The Company acquired 100% of the equity interests of Intermountain. The primary reason for the acquisition was to expand the Company's geographic footprint into the state of Idaho, consistent with its ongoing growth strategy.
 The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their fair values as of the November 1, 2014 acquisition date. Initial accounting for deferred taxes was provisionally measured as of November 1, 2014. During the current year, the provisionally measured deferred taxes were finalized. The resulting adjustment was a decrease in other assets of $225 thousand and a corresponding increase in goodwill of $225 thousand. There was no impact to earnings as a result of these adjustments. These adjustments were recorded as current period adjustments pursuant to the Company’s early adoption of ASU 2015-16. The application of the acquisition method of accounting resulted in the recognition of goodwill of $38.8 million and a core deposit intangible of $10.9 million, or 1.75% of core deposits. The goodwill represents the excess purchase price over the fair value of the net assets acquired. The goodwill is not deductible for income tax purposes.
The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
 
 
November 1, 2014
 
 
(in thousands)
 
 
 
Purchase price as of November 1, 2014
 
$
131,935

Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
 
 
Cash and cash equivalents
 
$
47,283

Investment securities
 
299,458

Federal Home Loan Bank stock
 
2,124

Acquired loans
 
502,595

Interest receivable
 
4,656

Premises and equipment
 
20,696

Other real estate owned
 
2,752

Core deposit intangible
 
10,900

Other assets
 
35,128

Deposits
 
(736,795
)
Other borrowings
 
(22,904
)
Securities sold under agreements to repurchase
 
(59,043
)
Other liabilities
 
(13,725
)
Total fair value of identifiable net assets
 
93,125

Goodwill
 
$
38,810


See Note 10, Goodwill and Other Intangible Assets, for further discussion of the accounting for goodwill and other intangible assets.
The operating results of the Company reported herein include the operating results produced by the acquired assets and assumed liabilities for the period November 1, 2014 to December 31, 2015. Disclosure of the amount of Intermountain’s revenue and net income (excluding integration costs) included in Columbia’s consolidated income statement is impracticable due to the integration of the operations and accounting for this acquisition.
For illustrative purposes only, the following table presents certain unaudited pro forma information for the years ended December 31, 2014 and 2013. This unaudited estimated pro forma financial information was calculated as if Intermountain had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Intermountain with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.
 
 
Unaudited Pro Forma
 
 
Years Ended December 31,
 
 
2014
 
2013
 
 
(in thousands except per share)
Total revenues (net interest income plus noninterest income)
 
$
397,152

 
$
360,655

Net income
 
$
85,939

 
$
72,587

Earnings per share - basic
 
$
1.56

 
$
1.32

Earnings per share - diluted
 
$
1.55

 
$
1.31


The following table shows the impact of the acquisition-related expenses related to the acquisition of Intermountain for the periods indicated to the various components of noninterest expense:
 
 
Year ended December 31,
 
 
2015
 
2014
 
 
(in thousands)
Noninterest Expense
 
 
 
 
Compensation and employee benefits
 
$
3,828

 
$
2,077

Occupancy
 
2,357

 
44

Advertising and promotion
 
448

 
464

Data processing
 
2,005

 
—

Legal and professional fees
 
1,247

 
2,114

Other
 
960

 
197

Total impact of acquisition-related costs to noninterest expense
 
$
10,845

 
$
4,896


West Coast Bancorp
On April 1, 2013, the Company completed its acquisition of West Coast Bancorp (“West Coast”). The Company paid $540.8 million in total consideration to acquire 100% of the voting equity interests of West Coast. The primary reason for the acquisition was to expand the Company’s geographic footprint consistent with its ongoing growth strategy.
The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their fair values as of the April 1, 2013 acquisition date. The application of the acquisition method of accounting resulted in the recognition of goodwill of $228.4 million and a core deposit intangible of $15.3 million, or 0.89% of core deposits. The goodwill represents the excess purchase price over the fair value of the net assets acquired. The goodwill is not deductible for income tax purposes.
The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
 
 
April 1, 2013
 
 
(in thousands)
 
 
 
Purchase price as of April 1, 2013
 
$
540,791

Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
 
 
Cash and cash equivalents
 
$
110,440

Investment securities
 
730,842

Federal Home Loan Bank stock
 
11,824

Acquired loans
 
1,407,798

Premises and equipment
 
35,884

Other real estate owned
 
14,708

Core deposit intangible
 
15,257

Other assets
 
75,820

Deposits
 
(1,883,407
)
Federal Home Loan Bank advances
 
(128,885
)
Other borrowings
 
(51,000
)
Other liabilities
 
(26,888
)
Total fair value of identifiable net assets
 
312,393

Goodwill
 
$
228,398


The operating results of the Company include the operating results produced by the acquired assets and assumed liabilities for the period April 1, 2013 to December 31, 2015. Disclosure of the amount of West Coast’s revenue and net income (excluding integration costs) included in Columbia’s consolidated income statement is impracticable due to the integration of the operations and accounting for this acquisition.
For illustrative purposes only, the following table presents certain unaudited pro forma information for the year ended December 31, 2013 as if West Coast had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of West Coast with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth, as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.
 
 
Unaudited Pro Forma
 
 
Year Ended December 31,
 
 
2013
 
 
(in thousands except per share)
Total revenues (net interest income plus noninterest income)
 
$
337,712

Net income
 
$
76,496

Earnings per share - basic
 
$
1.50

Earnings per share - diluted
 
$
1.46


The following table shows the impact of the acquisition-related expenses related to the acquisition of West Coast for the periods indicated to the various components of noninterest expense:
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Noninterest Expense
 
 
 
 
 
 
Compensation and employee benefits
 
$
65

 
$
798

 
$
8,440

Occupancy
 
—

 
696

 
4,684

Advertising and promotion
 
—

 
—

 
877

Data processing
 
—

 
684

 
767

Legal and professional fees
 
7

 
383

 
4,766

Other
 
—

 
1,975

 
5,954

Total impact of acquisition-related costs to noninterest expense
 
$
72

 
$
4,536

 
$
25,488
v3.3.1.900
Cash and Cash Equivalents
 12 Months Ended
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents
Cash and Cash Equivalents
The Company is required to maintain an average reserve balance with the Federal Reserve Bank or maintain such reserve balance in the form of cash. The average required reserve balance for the years ended December 31, 2015 and 2014 was approximately $61.6 million and $47.4 million, respectively, and was met by holding cash and maintaining an average balance with the Federal Reserve Bank.
v3.3.1.900
Securities
 12 Months Ended
Dec. 31, 2015
Available-for-sale Securities [Abstract]  
Securities
Securities
At December 31, 2015 the Company’s securities portfolio primarily consisted of securities issued by the U.S. government, U.S. government agencies, U.S. government-sponsored enterprises and state and municipalities. All of the Company’s mortgage-backed securities and collateralized mortgage obligations are issued by U.S. government agencies and U.S. government-sponsored enterprises and are implicitly guaranteed by the U.S. government. The Company had no other issuances in its portfolio which exceeded ten percent of shareholders’ equity.
The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of securities available for sale:
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
December 31, 2015
 
(in thousands)
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
1,296,955

 
$
4,525

 
$
(14,991
)
 
$
1,286,489

State and municipal securities
 
480,417

 
12,690

 
(938
)
 
492,169

U.S. government agency and government-sponsored enterprise securities
 
354,515

 
1,113

 
(1,846
)
 
353,782

U.S. government securities
 
20,439

 
—

 
(302
)
 
20,137

Other securities
 
5,284

 
24

 
(191
)
 
5,117

Total
 
$
2,157,610

 
$
18,352

 
$
(18,268
)
 
$
2,157,694

December 31, 2014
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
1,160,378

 
$
10,219

 
$
(8,210
)
 
$
1,162,387

State and municipal securities
 
483,578

 
14,432

 
(1,526
)
 
496,484

U.S. government agency and government-sponsored enterprise securities
 
416,919

 
856

 
(4,069
)
 
413,706

U.S. government securities
 
20,910

 
—

 
(411
)
 
20,499

Other securities
 
5,284

 
20

 
(123
)
 
5,181

Total
 
$
2,087,069

 
$
25,527

 
$
(14,339
)
 
$
2,098,257


Proceeds from sales of securities available-for-sale were $95.4 million, $63.3 million and $166.9 million for the years ended December 31, 2015, 2014 and 2013, respectively. The following table provides the gross realized gains and losses on the sales and calls of securities for the periods indicated:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Gross realized gains
 
$
1,591

 
$
553

 
$
632

Gross realized losses
 
(10
)
 
(1
)
 
(170
)
Net realized gains
 
$
1,581

 
$
552

 
$
462


The scheduled contractual maturities of investment securities available for sale at December 31, 2015 are presented as follows:
 
 
December 31, 2015
 
 
Amortized Cost
 
Fair Value
 
 
(in thousands)
Due within one year
 
$
22,191

 
$
22,418

Due after one year through five years
 
458,889

 
458,372

Due after five years through ten years
 
702,234

 
703,088

Due after ten years
 
969,012

 
968,699

Other securities with no stated maturity
 
5,284

 
5,117

Total investment securities available-for-sale
 
$
2,157,610

 
$
2,157,694


The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law: 
 
 
December 31, 2015
 
December 31, 2014
 
 
(in thousands)
Washington and Oregon State to secure public deposits
 
$
341,079

 
$
328,400

Federal Reserve Bank to secure borrowings
 
48,714

 
41,146

Other securities pledged
 
143,606

 
157,097

Total securities pledged as collateral
 
$
533,399

 
$
526,643

The following tables show the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2015 and 2014:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
December 31, 2015
 
(in thousands)
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
664,509

 
$
(7,610
)
 
$
214,325

 
$
(7,381
)
 
$
878,834

 
(14,991
)
State and municipal securities
 
48,261

 
(358
)
 
31,383

 
(580
)
 
79,644

 
(938
)
U.S. government agency and government-sponsored enterprise securities
 
193,400

 
(1,128
)
 
40,034

 
(718
)
 
233,434

 
(1,846
)
U.S. government securities
 
10,343

 
(136
)
 
9,794

 
(166
)
 
20,137

 
(302
)
Other securities
 
2,300

 
(15
)
 
2,780

 
(176
)
 
5,080

 
(191
)
Total
 
$
918,813

 
$
(9,247
)
 
$
298,316

 
$
(9,021
)
 
$
1,217,129

 
$
(18,268
)
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
258,825

 
$
(1,287
)
 
$
279,015

 
$
(6,924
)
 
$
537,840

 
$
(8,211
)
State and municipal securities
 
71,026

 
(543
)
 
44,148

 
(982
)
 
115,174

 
(1,525
)
U.S. government agency and government-sponsored enterprise securities
 
105,250

 
(518
)
 
216,221

 
(3,551
)
 
321,471

 
(4,069
)
U.S. government securities
 
—

 
—

 
19,450

 
(411
)
 
19,450

 
(411
)
Other securities
 
2,313

 
(2
)
 
2,834

 
(121
)
 
5,147

 
(123
)
Total
 
$
437,414

 
$
(2,350
)
 
$
561,668

 
$
(11,989
)
 
$
999,082

 
$
(14,339
)

At December 31, 2015, there were 143 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 49 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at December 31, 2015.
At December 31, 2015, there were 67 state and municipal government securities in an unrealized loss position, of which 27 were in a continuous loss position for 12 months or more. The unrealized losses on state and municipal securities were caused by interest rate changes or widening of market spreads subsequent to the purchase of the individual securities. Management monitors published credit ratings of these securities for adverse changes. As of December 31, 2015 none of the rated obligations of state and local government entities held by the Company had a below investment grade credit rating. Because the credit quality of these securities are investment grade and the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at December 31, 2015.
At December 31, 2015, there were 25 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, of which five were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at December 31, 2015.
At December 31, 2015, there were three U.S. government securities in an unrealized loss position, one of which was in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell this security nor does the Company consider it more likely than not that it will be required to sell this security before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider this investment to be other-than-temporarily impaired at December 31, 2015.
At December 31, 2015, there were two other securities in an unrealized loss position, of which one security, a mortgage-backed securities fund was in a continuous unrealized loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates and the additional risk premium investors are demanding for investment securities with these characteristics. The Company does not consider this investment to be other-than-temporarily impaired at December 31, 2015 as it has the intent and ability to hold the investment for sufficient time to allow for recovery in the market value.
v3.3.1.900
Loans
 12 Months Ended
Dec. 31, 2015
Loans Receivable, Net [Abstract]  
Financing Receivables [Text Block]
Loans
The Company’s loan portfolio includes originated and purchased loans. Originated loans and purchased loans for which there was no evidence of credit deterioration at their acquisition date and it was probable that we would be able to collect all contractually required payments are referred to collectively as loans, excluding purchased credit impaired loans. Purchased loans for which there was, at acquisition date, evidence of credit deterioration since their origination and it was probable that we would be unable to collect all contractually required payments are referred to as purchased credit impaired loans, or “PCI loans.”
The following is an analysis of the loan portfolio by major types of loans (net of unearned income):
 
 
December 31, 2015
 
December 31, 2014
 
 
Loans, excluding PCI loans
 
PCI Loans
 
Total
 
Loans, excluding PCI loans
 
PCI Loans
 
Total
 
 
(in thousands)
Commercial business
 
$
2,362,575

 
$
34,848

 
$
2,397,423

 
$
2,119,565

 
$
44,505

 
$
2,164,070

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
176,295

 
23,938

 
200,233

 
175,571

 
26,993

 
202,564

Commercial and multifamily residential
 
2,491,736

 
99,389

 
2,591,125

 
2,363,541

 
128,769

 
2,492,310

Total real estate
 
2,668,031

 
123,327

 
2,791,358

 
2,539,112

 
155,762

 
2,694,874

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
135,874

 
2,278

 
138,152

 
116,866

 
4,021

 
120,887

Commercial and multifamily residential
 
167,413

 
1,630

 
169,043

 
134,443

 
2,321

 
136,764

Total real estate construction
 
303,287

 
3,908

 
307,195

 
251,309

 
6,342

 
257,651

Consumer
 
342,601

 
18,823

 
361,424

 
364,182

 
23,975

 
388,157

Less: Net unearned income
 
(42,373
)
 
—

 
(42,373
)
 
(59,374
)
 
—

 
(59,374
)
Total loans, net of unearned income
 
5,634,121

 
180,906

 
5,815,027

 
5,214,794

 
230,584

 
5,445,378

Less: Allowance for loan and lease losses
 
(54,446
)
 
(13,726
)
 
(68,172
)
 
(53,233
)
 
(16,336
)
 
(69,569
)
Total loans, net
 
$
5,579,675

 
$
167,180

 
$
5,746,855

 
$
5,161,561

 
$
214,248

 
$
5,375,809

Loans held for sale
 
$
4,509

 
$
—

 
$
4,509

 
$
1,116

 
$
—

 
$
1,116


At December 31, 2015 and 2014, the Company had no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho.
The Company has made loans to executive officers and directors of the Company and related interests. These loans are made on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons and do not involve more than the normal risk of collectability. The aggregate dollar amount of these loans was $10.0 million and $13.2 million at December 31, 2015 and 2014, respectively. During 2015, advances on related party loans totaled $6 thousand and repayments on related party loans totaled $3.2 million.
At December 31, 2015 and 2014, $2.22 billion and $1.08 billion of commercial and residential real estate loans were pledged as collateral on Federal Home Loan Bank advances. The Company has also pledged $50.1 million and $46.0 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at December 31, 2015 and 2014, respectively.
Nonaccrual loans totaled $21.5 million and $31.4 million at December 31, 2015 and 2014, respectively. The amount of interest income foregone as a result of these loans being placed on nonaccrual status totaled $1.3 million for 2015, $2.2 million for 2014 and $2.9 million for 2013. There were no loans 90 days past due and still accruing interest as of December 31, 2015 and $1.4 million loans 90 days past due and still accruing interest as of December 31, 2014. At December 31, 2015 and 2014, there were $2.9 million and $349 thousand, respectively, of commitments of additional funds for loans accounted for on a nonaccrual basis.
The following is an analysis of nonaccrual loans as of December 31, 2015 and 2014:
 
 
 
December 31, 2015
 
December 31, 2014
 
 
Recorded
Investment
Nonaccrual
Loans
 
Unpaid Principal
Balance
Nonaccrual
Loans
 
Recorded
Investment
Nonaccrual
Loans
 
Unpaid Principal
Balance
Nonaccrual
Loans
 
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
Secured
 
$
9,395

 
$
15,688

 
$
16,552

 
$
21,453

Unsecured
 
42

 
256

 
247

 
269

Real estate:
 
 
 
 
 
 
 
 
One-to-four family residential
 
820

 
1,866

 
2,822

 
5,680

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
Commercial land
 
349

 
332

 
821

 
1,113

Income property
 
2,843

 
3,124

 
3,200

 
5,521

Owner occupied
 
6,321

 
8,943

 
3,826

 
5,837

Real estate construction:
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
Land and acquisition
 
362

 
385

 
95

 
112

Residential construction
 
566

 
679

 
370

 
370

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
Owner occupied
 
—

 
—

 
480

 
489

Consumer
 
766

 
990

 
2,939

 
3,930

Total
 
$
21,464

 
$
32,263

 
$
31,352

 
$
44,774


 
Loans, excluding purchased credit impaired loans
The following is an aging of the recorded investment of the loan portfolio as of December 31, 2015 and 2014:
 
 
 
Current
Loans
 
30 - 59
Days
Past Due
 
60 - 89
Days
Past Due
 
Greater
than 90
Days Past
Due
 
Total
Past Due
 
Nonaccrual
Loans
 
Total Loans
December 31, 2015
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,241,069

 
$
11,611

 
$
617

 
$
—

 
$
12,228

 
$
9,395

 
$
2,262,692

Unsecured
 
94,867

 
39

 
—

 
—

 
39

 
42

 
94,948

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
170,913

 
1,637

 
66

 
—

 
1,703

 
820

 
173,436

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
212,740

 
69

 
—

 
—

 
69

 
349

 
213,158

Income property
 
1,305,502

 
1,750

 
684

 
—

 
2,434

 
2,843

 
1,310,779

Owner occupied
 
939,396

 
599

 
—

 
—

 
599

 
6,321

 
946,316

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
14,388

 
—

 
—

 
—

 
—

 
362

 
14,750

Residential construction
 
119,809

 
—

 
—

 
—

 
—

 
566

 
120,375

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
83,634

 
—

 
—

 
—

 
—

 
—

 
83,634

Owner occupied
 
81,671

 
—

 
—

 
—

 
—

 
—

 
81,671

Consumer
 
328,219

 
2,597

 
780

 
—

 
3,377

 
766

 
332,362

Total
 
$
5,592,208

 
$
18,302

 
$
2,147

 
$
—

 
$
20,449

 
$
21,464

 
$
5,634,121

 
 
Current
Loans
 
30 - 59
Days
Past Due
 
60 - 89
Days
Past Due
 
Greater
than 90
Days Past
Due
 
Total
Past Due
 
Nonaccrual
Loans
 
Total Loans
December 31, 2014
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,004,418

 
$
5,137

 
$
6,149

 
$
1,372

 
$
12,658

 
$
16,552

 
$
2,033,628

Unsecured
 
79,661

 
185

 
—

 
—

 
185

 
247

 
80,093

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
167,197

 
1,700

 
45

 
—

 
1,745

 
2,822

 
171,764

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
187,470

 
1,454

 
34

 
—

 
1,488

 
821

 
189,779

Income property
 
1,294,982

 
3,031

 
786

 
—

 
3,817

 
3,200

 
1,301,999

Owner occupied
 
839,689

 
937

 
289

 
—

 
1,226

 
3,826

 
844,741

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
15,462

 
953

 
—

 
—

 
953

 
95

 
16,510

Residential construction
 
97,821

 
326

 
—

 
4

 
330

 
370

 
98,521

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
73,783

 
—

 
—

 
—

 
—

 
—

 
73,783

Owner occupied
 
57,470

 
—

 
994

 
—

 
994

 
480

 
58,944

Consumer
 
341,032

 
933

 
118

 
10

 
1,061

 
2,939

 
345,032

Total
 
$
5,158,985

 
$
14,656

 
$
8,415

 
$
1,386

 
$
24,457

 
$
31,352

 
$
5,214,794


The following is an analysis of the impaired loans (see Note 1) as of December 31, 2015 and 2014: 
 
 
Recorded Investment
of Loans
Collectively Measured
for Contingency
Provision
 
Recorded Investment
of Loans
Individually
Measured for
Specific
Impairment
 
Impaired Loans With
Recorded Allowance
 
Impaired Loans Without
Recorded Allowance
 
 
Recorded
Investment
 
Unpaid
Principal
Balance
 
Related
Allowance
 
Recorded
Investment
 
Unpaid
Principal
Balance
December 31, 2015
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,257,168

 
$
5,524

 
$
690

 
$
718

 
$
321

 
$
4,834

 
$
6,455

Unsecured
 
94,948

 
—

 
—

 
—

 
—

 
—

 
—

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
172,150

 
1,286

 
314

 
339

 
314

 
972

 
1,397

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
213,158

 
—

 
—

 
—

 
—

 
—

 
—

Income property
 
1,308,673

 
2,106

 
—

 
—

 
—

 
2,106

 
2,311

Owner occupied
 
940,261

 
6,055

 
—

 
—

 
—

 
6,055

 
8,528

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
14,283

 
467

 
—

 
—

 
—

 
467

 
490

Residential construction
 
119,813

 
562

 
335

 
335

 
3

 
227

 
227

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
83,634

 
—

 
—

 
—

 
—

 
—

 
—

Owner occupied
 
81,671

 
—

 
—

 
—

 
—

 
—

 
—

Consumer
 
332,282

 
80

 
15

 
15

 
15

 
65

 
139

Total
 
$
5,618,041

 
$
16,080

 
$
1,354

 
$
1,407

 
$
653

 
$
14,726

 
$
19,547

 
 
 
Recorded Investment
of Loans
Collectively Measured
for Contingency
Provision
 
Recorded Investment
of Loans
Individually
Measured for
Specific
Impairment
 
Impaired Loans With
Recorded Allowance
 
Impaired Loans Without
Recorded Allowance
 
 
Recorded
Investment
 
Unpaid
Principal
Balance
 
Related
Allowance
 
Recorded
Investment
 
Unpaid
Principal
Balance
December 31, 2014
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,023,104

 
$
10,524

 
$
99

 
$
99

 
$
25

 
$
10,425

 
$
12,410

Unsecured
 
80,091

 
2

 
2

 
2

 
2

 
—

 
—

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
169,619

 
2,145

 
424

 
465

 
120

 
1,721

 
2,370

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
189,779

 
—

 
—

 
—

 
—

 
—

 
—

Income property
 
1,295,650

 
6,349

 
—

 
—

 
—

 
6,349

 
10,720

Owner occupied
 
835,895

 
8,846

 
582

 
582

 
27

 
8,264

 
12,732

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
16,401

 
109

 
109

 
109

 
67

 
—

 
—

Residential construction
 
98,521

 
—

 
—

 
—

 
—

 
—

 
—

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
73,783

 
—

 
—

 
—

 
—

 
—

 
—

Owner occupied
 
58,944

 
—

 
—

 
—

 
—

 
—

 
—

Consumer
 
344,908

 
124

 
—

 
—

 
—

 
124

 
201

Total
 
$
5,186,695

 
$
28,099

 
$
1,216

 
$
1,257

 
$
241

 
$
26,883

 
$
38,433



The following table provides additional information on impaired loans for the years ended December 31, 2015, 2014 and 2013:
 
 
Year Ended December 31, 2015
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
 
Average Recorded
Investment
Impaired Loans 
 
Interest Recognized
on
Impaired Loans
 
Average Recorded
Investment
Impaired Loans 
 
Interest Recognized
on
Impaired Loans
 
Average Recorded
Investment
Impaired Loans 
 
Interest Recognized
on
Impaired Loans
 
 
(in thousands)
Commercial business
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
7,987

 
$
84

 
$
7,345

 
$
36

 
$
5,636

 
$
19

Unsecured
 
—

 
—

 
19

 
1

 
61

 
3

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
2,848

 
47

 
2,094

 
49

 
1,665

 
63

Commercial & multifamily residential
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
94

 
—

 
82

 
—

 
1,691

 
—

Income property
 
2,913

 
36

 
6,782

 
270

 
8,910

 
238

Owner occupied
 
7,052

 
26

 
9,472

 
956

 
10,779

 
971

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
641

 
5

 
694

 
6

 
2,624

 
6

Residential construction
 
648

 
—

 
—

 
—

 
420

 
—

Consumer
 
189

 
4

 
147

 
9

 
253

 
6

Total
 
$
22,372

 
$
202

 
$
26,635

 
$
1,327

 
$
32,039

 
$
1,306



The following is an analysis of loans classified as troubled debt restructurings (“TDR”) for the years ended December 31, 2015, 2014 and 2013:
 
 
Year Ended December 31, 2015
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
 
Number of TDR Modifications
 
Pre-Modification
Outstanding
Recorded
Investment
 
Post-Modification
Outstanding
Recorded
Investment
 
Number of TDR Modifications
 
Pre-Modification
Outstanding
Recorded
Investment
 
Post-Modification
Outstanding
Recorded
Investment
 
Number of TDR Modifications
 
Pre-Modification
Outstanding
Recorded
Investment
 
Post-Modification
Outstanding
Recorded
Investment
 
 
(dollars in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
5

 
$
3,724

 
$
3,706

 
4

 
$
759

 
$
759

 
2

 
$
190

 
$
190

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
1

 
30

 
30

 
2

 
494

 
494

 
1

 
113

 
113

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
—

 
—

 
—

 
—

 
—

 
—

 
1

 
137

 
137

Income property
 
—

 
—

 
—

 
1

 
143

 
126

 
4

 
1,186

 
1,186

Owner occupied
 
—

 
—

 
—

 
1

 
1,496

 
1,496

 
1

 
172

 
172

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
—

 
—

 
—

 
—

 
—

 
—

 
1

 
117

 
117

Consumer
 
1

 
54

 
54

 
—

 
—

 
—

 
2

 
53

 
53

Total
 
7

 
$
3,808

 
$
3,790

 
8

 
$
2,892

 
$
2,875

 
12

 
$
1,968

 
$
1,968


The Company’s loans classified as TDR are loans that have been modified or the borrower has been granted special concessions due to financial difficulties, that if not for the challenges of the borrower, the Company would not otherwise consider. The Company had no commitments to lend additional funds on loans classified as TDR as of December 31, 2015 and 2014. The TDR modifications or concessions are made to increase the likelihood that these borrowers with financial difficulties will be able to satisfy their debt obligations as amended. Credit losses for loans classified as TDR are measured on the same basis as impaired loans. For impaired loans, an allowance is established when the collateral value less selling costs (or discounted cash flows or observable market price) of the impaired loan is lower than the recorded investment of that loan. The Company did not have any loans modified as TDR that defaulted within 12 months of being modified as TDR during the years ended December 31,
2015, 2014, and 2013.
Purchased Credit Impaired Loans (“PCI Loans”)
PCI loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. Loans that have common risk characteristics are aggregated into pools. The Company remeasures contractual and expected cash flows, at the pool-level, on a quarterly basis.
Contractual cash flows are calculated based upon the loan pool terms after applying a prepayment factor. Calculation of the applied prepayment factor for contractual cash flows is the same as described below for expected cash flows.
Inputs to the determination of expected cash flows include cumulative default and prepayment data as well as loss severity and recovery lag information. Cumulative default and prepayment data are calculated via a transition matrix. The transition matrix is a matrix of probability values that specifies the probability of a loan pool transitioning into a particular delinquency state (e.g. 0-30 days past due, 31 to 60 days, etc.) given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages, and recovery lags are based upon the collateral within the loan pools.
The excess of cash flows expected to be collected over the initial fair value of purchased credit impaired loans is referred to as the accretable yield and is accreted into interest income over the estimated life of the acquired loans using the effective yield method. Other adjustments to the accretable yield include changes in the estimated remaining life of the acquired loans, changes in expected cash flows and changes of indices for acquired loans with variable interest rates.
The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of December 31, 2015 and 2014:
 
 
December 31, 2015
 
December 31, 2014
 
 
(in thousands)
Commercial business
 
$
38,784

 
$
50,334

Real estate:
 
 
 
 
One-to-four family residential
 
27,195

 
31,981

Commercial and multifamily residential
 
106,308

 
140,398

Total real estate
 
133,503

 
172,379

Real estate construction:
 
 
 
 
One-to-four family residential
 
2,326

 
4,353

Commercial and multifamily residential
 
1,834

 
2,588

Total real estate construction
 
4,160

 
6,941

Consumer
 
20,903

 
26,814

Subtotal of purchased credit impaired loans
 
197,350

 
256,468

Less:
 
 
 
 
Valuation discount resulting from acquisition accounting
 
16,444

 
25,884

Allowance for loan losses
 
13,726

 
16,336

PCI loans, net of valuation discounts and allowance for loan losses
 
$
167,180

 
$
214,248


The following table shows the changes in accretable yield for acquired loans for the years ended December 31, 2015, 2014, and 2013:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Balance at beginning of period
 
$
73,849

 
$
103,907

 
$
166,888

Accretion
 
(21,919
)
 
(36,066
)
 
(51,816
)
Disposals
 
(1,681
)
 
(3,386
)
 
(6,898
)
Reclassifications from (to) nonaccretable difference
 
8,732

 
9,394

 
(4,267
)
Balance at end of period
 
$
58,981

 
$
73,849

 
$
103,907


The Company did not acquire any loans accounted for under ASC 310-30 during 2015 or 2014.
v3.3.1.900
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit
 12 Months Ended
Dec. 31, 2015
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit  
Allowance for Loan and Lease Losses and Unfunded Loan Commitments and Letters of Credit
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit
Loans, excluding PCI loans
We maintain an allowance for loan and lease losses (“ALLL”) to absorb losses inherent in the loan portfolio. The size of the ALLL is determined through quarterly assessments of the probable estimated losses in the loan portfolio. Our methodology for making such assessments and determining the adequacy of the ALLL includes the following key elements:
1.
General valuation allowance consistent with the Contingencies topic of the FASB ASC.
2.
Classified loss reserves on specific relationships. Specific allowances for identified problem loans are determined in accordance with the Receivables topic of the FASB ASC.
3.
The unallocated allowance provides for other factors inherent in our loan portfolio that may not have been contemplated in the general and specific components of the allowance. This unallocated amount generally comprises less than 5% of the allowance. The unallocated amount is reviewed quarterly based on trends in credit losses, the results of credit reviews and overall economic trends.
The general valuation allowance is calculated quarterly using quantitative and qualitative information about specific loan classes. The minimum required level with respect to which an entity develops a methodology to determine its ALLL is by general categories of loans, such as commercial business, real estate, and consumer. However, the Company’s methodology in determining its ALLL is prepared in a more detailed manner at the loan class level, utilizing specific categories such as commercial business secured, commercial business unsecured, real estate commercial land, and real estate income property multifamily. The quantitative information uses historical losses from a specific loan class and incorporates the loan’s risk rating migration from origination to the point of loss based upon the consideration of an appropriate look back period.
A loan’s risk rating is primarily determined based upon the borrower’s ability to fulfill its debt obligation from a cash flow perspective. In the event there is financial deterioration of the borrower, the borrower’s other sources of income or repayment are also considered, including recent appraisal values for collateral dependent loans. The qualitative information takes into account general economic and business conditions affecting our marketplace, seasoning of the loan portfolio, duration of the business cycle, etc. to ensure our methodologies reflect the current economic environment and other factors as using historical loss information exclusively may not give an accurate estimate of inherent losses within the Company’s loan portfolio.
When a loan is deemed to be impaired, the Company has to determine if a specific valuation allowance is required for that loan. The specific valuation allowance is a reserve, calculated at the individual loan level, for each loan determined to be both impaired and containing a value less than its recorded investment. The Company measures the impairment based on the discounted expected future cash flows, observable market price, or the fair value of the collateral less selling costs if the loan is collateral dependent or if foreclosure is probable. The specific reserve for each loan is equal to the difference between the recorded investment in the loan and its determined impairment value.
The ALLL is increased by provisions for loan and lease losses (“provision”) charged to expense, and is reduced by loans charged off, net of recoveries or a recovery of previous provisions. While the Company’s management believes the best information available is used to determine the ALLL, changes in market conditions could result in adjustments to the ALLL, affecting net income, if circumstances differ from the assumptions used in determining the ALLL.
We have used the same methodology for ALLL calculations during 2015, 2014 and 2013. Adjustments to the percentages of the ALLL allocated to loan categories are made based on trends with respect to delinquencies and problem loans within each class of loans. The Company reviews the ALLL quantitative and qualitative methodology on a quarterly basis and makes adjustments when appropriate. The Company continues to make revisions to our ALLL as necessary to maintain adequate reserves. The Company carefully monitors the loan portfolio and continues to emphasize the importance of credit quality.
Once it is determined that all or a portion of a loan balance is uncollectable, and the amount can be reasonably estimated, the uncollectable portion of the loan is charged-off.
PCI Loans
Purchased credit impaired loans that have common risk characteristics are aggregated into loan pools. When required, we record impairment, at the pool-level, to adjust the pool’s carrying value to its net present value of expected future cash flows. Quarterly, we re-measure expected loan pool cash flows. If, due to credit deterioration, the present value of expected cash flows is less than carrying value, we reduce the loan pool’s carrying value by adjusting the ALLL with an impairment charge to earnings which is recorded as provision for loan losses. If credit quality improves and the present value of expected cash flows exceeds carrying value, we increase the loan pool’s carrying value by recapturing previously recorded ALLL, if any. See Note 5, Loans, for further discussion of the accounting for PCI loans.
Credit losses attributable to draws on purchased credit impaired loans, advanced subsequent to the loan purchase date, are accounted for under ASC 450-20 and those amounts are also subject to the Company’s internal and external credit review. An ALLL is estimated in a similar manner as loans, excluding PCI loans, and a provision for loan losses is charged to earnings as necessary.
The following tables show a detailed analysis of the ALLL for loans for the years ended December 31, 2015, 2014 and 2013: 
 
 
Beginning
Balance
 
Charge-offs
 
Recoveries
 
Provision (Recovery)
 
Ending
Balance
 
Specific
Reserve
 
General
Allocation
Year Ended December 31, 2015
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
25,923

 
$
(7,486
)
 
$
2,069

 
$
11,815

 
$
32,321

 
$
321

 
$
32,000

Unsecured
 
927

 
(780
)
 
267

 
885

 
1,299

 
—

 
1,299

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
2,281

 
(376
)
 
307

 
(1,296
)
 
916

 
314

 
602

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
799

 
—

 
291

 
88

 
1,178

 
—

 
1,178

Income property
 
9,159

 
(390
)
 
3,568

 
(5,721
)
 
6,616

 
—

 
6,616

Owner occupied
 
5,007

 
(115
)
 
116

 
542

 
5,550

 
—

 
5,550

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,197

 
—

 
103

 
(961
)
 
339

 
—

 
339

Residential construction
 
1,860

 
—

 
90

 
(1,217
)
 
733

 
3

 
730

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
622

 
—

 
8

 
(242
)
 
388

 
—

 
388

Owner occupied
 
434

 
—

 
—

 
572

 
1,006

 
—

 
1,006

Consumer
 
3,180

 
(2,066
)
 
931

 
1,486

 
3,531

 
15

 
3,516

Purchased credit impaired
 
16,336

 
(13,854
)
 
7,329

 
3,915

 
13,726

 
—

 
13,726

Unallocated
 
1,844

 
—

 
—

 
(1,275
)
 
569

 
—

 
569

Total
 
$
69,569

 
$
(25,067
)
 
$
15,079

 
$
8,591

 
$
68,172

 
$
653

 
$
67,519

 
 
Beginning
Balance
 
Charge-offs
 
Recoveries
 
Provision (Recovery)
 
Ending
Balance
 
Specific
Reserve
 
General
Allocation
Year Ended December 31, 2014
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
31,027

 
$
(4,159
)
 
$
2,637

 
$
(3,582
)
 
$
25,923

 
$
25

 
$
25,898

Unsecured
 
696

 
(130
)
 
370

 
(9
)
 
927

 
2

 
925

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
1,252

 
(230
)
 
159

 
1,100

 
2,281

 
120

 
2,161

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
489

 
(29
)
 
70

 
269

 
799

 
—

 
799

Income property
 
9,234

 
(1,934
)
 
819

 
1,040

 
9,159

 
—

 
9,159

Owner occupied
 
3,605

 
(1,030
)
 
51

 
2,381

 
5,007

 
27

 
4,980

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
610

 
—

 
740

 
(153
)
 
1,197

 
67

 
1,130

Residential construction
 
822

 
—

 
1,190

 
(152
)
 
1,860

 
—

 
1,860

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
285

 
—

 
—

 
337

 
622

 
—

 
622

Owner occupied
 
58

 
—

 
—

 
376

 
434

 
—

 
434

Consumer
 
2,547

 
(2,774
)
 
1,353

 
2,054

 
3,180

 
—

 
3,180

Purchased credit impaired
 
20,174

 
(14,436
)
 
7,721

 
2,877

 
16,336

 
—

 
16,336

Unallocated
 
1,655

 
—

 
—

 
189

 
1,844

 
—

 
1,844

Total
 
$
72,454

 
$
(24,722
)
 
$
15,110

 
$
6,727

 
$
69,569

 
$
241

 
$
69,328


 
 
Beginning
Balance
 
Charge-offs
 
Recoveries
 
Provision (Recovery)
 
Ending
Balance
 
Specific
Reserve
 
General
Allocation
Year ended December 31, 2013
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
27,270

 
$
(4,148
)
 
$
1,512

 
$
6,393

 
$
31,027

 
$
343

 
$
30,684

Unsecured
 
753

 
(794
)
 
932

 
(195
)
 
696

 
35

 
661

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
694

 
(228
)
 
270

 
516

 
1,252

 
138

 
1,114

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
460

 
(20
)
 
169

 
(120
)
 
489

 
—

 
489

Income property
 
11,033

 
(1,405
)
 
489

 
(883
)
 
9,234

 
26

 
9,208

Owner occupied
 
6,362

 
(1,118
)
 
375

 
(2,014
)
 
3,605

 
1,073

 
2,532

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,171

 
(32
)
 
2,553

 
(3,082
)
 
610

 
71

 
539

Residential construction
 
635

 
(101
)
 
112

 
176

 
822

 
—

 
822

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
316

 
—

 
—

 
(31
)
 
285

 
—

 
285

Owner occupied
 
102

 
—

 
—

 
(44
)
 
58

 
—

 
58

Consumer
 
2,437

 
(2,242
)
 
552

 
1,800

 
2,547

 
4

 
2,543

Purchased credit impaired
 
30,056

 
(13,853
)
 
7,232

 
(3,261
)
 
20,174

 
—

 
20,174

Unallocated
 
1,011

 
—

 
—

 
644

 
1,655

 
—

 
1,655

Total
 
$
82,300

 
$
(23,941
)
 
$
14,196

 
$
(101
)
 
$
72,454

 
$
1,690

 
$
70,764

Changes in the allowance for unfunded commitments and letters of credit, a component of other liabilities in the consolidated balance sheet, are summarized as follows:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Beginning balance
 
$
2,655

 
$
2,505

 
$
1,915

Net changes in the allowance for unfunded commitments and letters of credit
 
275

 
150

 
590

Ending balance
 
$
2,930

 
$
2,655

 
$
2,505


Risk Elements
The extension of credit in the form of loans or other credit products to individuals and businesses is one of our principal business activities. Our policies and applicable laws and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower.
Risk ratings are reviewed and updated whenever appropriate, with more periodic reviews as the risk and dollar value of loss on the loan increases. In the event full collection of principal and interest is not reasonably assured, the loan is appropriately downgraded and, if warranted, placed on nonaccrual status even though the loan may be current as to principal and interest payments. Additionally, we assess whether an impairment of a loan warrants specific reserves or a write-down of the loan.
Pass loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special mention loans have potential weaknesses that, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans with a risk rating of Substandard or worse are reported as classified loans in our ALLL analysis. We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. Substandard loans reflect loans where a loss is possible if loan weaknesses are not corrected. Doubtful loans have a high probability of loss, however, the amount of loss has not yet been determined. Loss loans are considered uncollectable and when identified, are charged off.
The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans as of December 31, 2015 and 2014:
 
 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2015
 
(in thousands)
Loans, excluding PCI loans
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,146,729

 
$
59,746

 
$
56,217

 
$
—

 
$
—

 
$
2,262,692

Unsecured
 
93,347

 
278

 
1,323

 
—

 
—

 
94,948

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
171,945

 
52

 
1,439

 
—

 
—

 
173,436

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
207,768

 
4,966

 
424

 
—

 
—

 
213,158

Income property
 
1,296,043

 
5,889

 
8,847

 
—

 
—

 
1,310,779

Owner occupied
 
918,986

 
9,668

 
17,662

 
—

 
—

 
946,316

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
14,388

 
—

 
362

 
—

 
—

 
14,750

Residential construction
 
119,243

 
—

 
1,132

 
—

 
—

 
120,375

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
83,634

 
—

 
—

 
—

 
—

 
83,634

Owner occupied
 
81,270

 
—

 
401

 
—

 
—

 
81,671

Consumer
 
328,286

 
—

 
4,076

 
—

 
—

 
332,362

Total
 
$
5,461,639

 
$
80,599

 
$
91,883

 
$
—

 
$
—

 
5,634,121

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for loan losses
 
54,446

Loans, excluding PCI loans, net
 
$
5,579,675

 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2014
 
(in thousands)
Loans, excluding PCI loans
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
1,963,210

 
$
15,790

 
$
54,628

 
$
—

 
$
—

 
$
2,033,628

Unsecured
 
79,534

 
—

 
559

 
—

 
—

 
80,093

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
163,914

 
55

 
7,795

 
—

 
—

 
171,764

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
183,701

 
4,217

 
1,861

 
—

 
—

 
189,779

Income property
 
1,287,729

 
5,885

 
8,385

 
—

 
—

 
1,301,999

Owner occupied
 
825,694

 
7,876

 
11,171

 
—

 
—

 
844,741

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
15,307

 
167

 
1,036

 
—

 
—

 
16,510

Residential construction
 
96,031

 
909

 
1,581

 
—

 
—

 
98,521

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
73,783

 
—

 
—

 
—

 
—

 
73,783

Owner occupied
 
58,055

 
—

 
889

 
—

 
—

 
58,944

Consumer
 
339,695

 
68

 
5,269

 
—

 
—

 
345,032

Total
 
$
5,086,653

 
$
34,967

 
$
93,174

 
$
—

 
$
—

 
5,214,794

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for loan losses
 
53,233

Loans, excluding PCI loans, net
 
$
5,161,561


The following is an analysis of the credit quality of our PCI loan portfolio as of December 31, 2015 and 2014:
 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2015
 
(in thousands)
PCI loans:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
31,468

 
$
101

 
$
5,995

 
$
—

 
$
—

 
$
37,564

Unsecured
 
1,218

 
—

 
2

 
—

 
—

 
1,220

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
25,018

 
—

 
2,177

 
—

 
—

 
27,195

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
8,234

 
—

 
664

 
—

 
—

 
8,898

Income property
 
36,426

 
—

 
5,916

 
—

 
—

 
42,342

Owner occupied
 
53,071

 
261

 
1,736

 
—

 
—

 
55,068

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,086

 
—

 
479

 
—

 
—

 
1,565

Residential construction
 
427

 
—

 
334

 
—

 
—

 
761

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
1,303

 
—

 
—

 
—

 
—

 
1,303

Owner occupied
 
531

 
—

 
—

 
—

 
—

 
531

Consumer
 
20,122

 
—

 
781

 
—

 
—

 
20,903

Total
 
$
178,904

 
$
362

 
$
18,084

 
$
—

 
$
—

 
197,350

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Valuation discount resulting from acquisition accounting
 
16,444

Allowance for loan losses
 
13,726

PCI loans, net
 
$
167,180

 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2014
 
(in thousands)
PCI loans:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
37,927

 
$
937

 
$
9,223

 
$
—

 
$
—

 
$
48,087

Unsecured
 
2,156

 
—

 
91

 
—

 
—

 
2,247

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
28,822

 
—

 
3,159

 
—

 
—

 
31,981

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
9,104

 
—

 
6,240

 
—

 
—

 
15,344

Income property
 
51,435

 
1,892

 
7,186

 
—

 
—

 
60,513

Owner occupied
 
58,629

 
346

 
5,566

 
—

 
—

 
64,541

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,595

 
—

 
913

 
—

 
—

 
2,508

Residential construction
 
741

 
—

 
1,104

 
—

 
—

 
1,845

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
1,435

 
—

 
227

 
—

 
—

 
1,662

Owner occupied
 
926

 
—

 
—

 
—

 
—

 
926

Consumer
 
24,037

 
—

 
2,777

 
—

 
—

 
26,814

Total
 
$
216,807

 
$
3,175

 
$
36,486

 
$
—

 
$
—

 
256,468

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Valuation discount resulting from acquisition accounting
 
25,884

Allowance for loan losses
 
16,336

PCI loans, net
 
$
214,248
v3.3.1.900
Other Real Estate Owned
 12 Months Ended
Dec. 31, 2015
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]  
Other Real Estate Owned
Other Real Estate Owned
The following table sets forth activity in OREO for the period:
 
 
December 31, 2015
 
December 31, 2014
 
 
(in thousands)
Balance, beginning of period
 
$
22,190

 
$
35,927

Established through acquisitions
 
—

 
2,752

Transfers in
 
8,688

 
10,200

Valuation adjustments
 
(1,986
)
 
(4,039
)
Proceeds from sale of OREO property
 
(19,292
)
 
(28,559
)
Gain on sale of OREO, net
 
4,138

 
5,909

Balance, end of period
 
$
13,738

 
$
22,190


At December 31, 2015, the carrying amount of foreclosed residential real estate properties held as a result of obtaining physical possession was $2.4 million and the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $1.3 million.
v3.3.1.900
FDIC Loss-sharing Asset and Covered Assets
 12 Months Ended
Dec. 31, 2015
Covered Assets And FDIC Loss Sharing Asset  
Covered Assets and FDIC Loss sharing Asset
FDIC Loss-sharing Asset and Covered Assets
We are a party to eight loss-sharing agreements with the FDIC relating to our four FDIC-assisted acquisitions. Such agreements cover a substantial portion of losses incurred on acquired covered loans and OREO. The loss-sharing agreements relate to the acquisitions of (1) Columbia River Bank in January 2010, (2) American Marine Bank in January 2010, (3) Summit Bank in May 2011, and (4) First Heritage Bank in May 2011. Under the terms of the loss-sharing agreements, the FDIC will absorb 80% of losses and share in 80% of loss recoveries up to specified amounts. With respect to loss-sharing agreements for two acquisitions completed in 2010, after those specified amounts, the FDIC will absorb 95% of losses and share in 95% of loss recoveries. The loss-sharing provisions of the agreements for non-single family and single-family mortgage loans are in effect for five and ten years, respectively, and the loss recovery provisions are in effect for eight and ten years, respectively. The loss-sharing provisions for the Columbia River Bank and American Marine Bank non-single family covered assets were effective through the end of the first quarter of 2015. Accordingly, further activity will be limited to recoveries through the first quarter of 2018 for assets covered by these loss-sharing agreements.
Ten years and forty-five days after the applicable acquisition dates, the Bank must pay to the FDIC a clawback in the event the losses from the acquisitions fail to reach stated levels. The amount of the clawback is determined by a formula specified in each individual loss-sharing agreement. As of December 31, 2015 and 2014, the net present value of the Bank’s estimated clawback liability is $5.2 million and $4.2 million, respectively, which is included in other liabilities on the consolidated balance sheet.
At December 31, 2015 and 2014, the FDIC loss-sharing asset is comprised of an FDIC indemnification asset of $6.0 million and $13.1 million, respectively, and an FDIC receivable of $605 thousand and $2.1 million, respectively. The indemnification represents the net present value of cash flows the Company expects to collect from the FDIC under the loss-sharing agreements and the FDIC receivable represents the reimbursable amounts from the FDIC that have not yet been received.
For PCI loans, the Company remeasures contractual and expected cash flows on a quarterly basis. When the quarterly remeasurement process results in a decrease in expected cash flows due to an increase in expected credit losses, impairment is recorded. As a result of this impairment, for loans covered by loss-sharing agreements with respect to which the loss-sharing provisions are still effective, the indemnification asset is increased to reflect anticipated future cash to be received from the FDIC. Consistent with the loss-sharing agreements between the Company and the FDIC, the amount of the increase to the indemnification asset is measured as 80% of the resulting impairment.
Alternatively, when the quarterly remeasurement results in an increase in expected future cash flows due to a decrease in expected credit losses, the nonaccretable difference decreases and the effective yield of the related loan portfolio is increased. As a result of the improved expected cash flows, for loans covered by loss-sharing agreements with respect to which the loss-sharing provisions are still effective, the indemnification asset would be reduced first by the amount of any impairment previously recorded and, second, by increased amortization over the remaining life of the related loss-sharing agreement.
The following table shows a detailed analysis of the FDIC loss-sharing asset for the years ending December 31, 2015 and 2014:
 
 
2015
 
2014
 
 
(in thousands)
Balance at beginning of period
 
$
15,174

 
$
39,846

Adjustments not reflected in income:
 
 
 
 
Cash received from the FDIC, net
 
(2,794
)
 
(2,499
)
FDIC reimbursable recoveries, net
 
(1,802
)
 
(2,184
)
Adjustments reflected in income:
 
 
 
 
Amortization, net
 
(6,184
)
 
(21,279
)
Loan impairment
 
2,268

 
2,301

Sale of other real estate
 
(1,237
)
 
(2,179
)
Write-downs of other real estate
 
1,158

 
1,065

Other
 
(15
)
 
103

Balance at end of period
 
$
6,568

 
$
15,174

The following table presents information about the composition of the FDIC loss-sharing asset, the clawback liability, and the non-single family and the single family covered assets as of the date indicated:
 
 
December 31, 2015
 
 
Columbia River Bank
 
American Marine Bank
 
Summit Bank
 
First Heritage Bank
 
Total
 
 
(in thousands)
FDIC loss-sharing asset
 
$
130

 
$
2,598

 
$
1,886

 
$
1,954

 
$
6,568

Clawback liability
 
$
3,248

 
$
1,227

 
$
—

 
$
679

 
$
5,154

Non-single family covered assets
 
$
73,707

 
$
12,111

 
$
9,405

 
$
15,596

 
$
110,819

Single family covered assets
 
$
8,114

 
$
22,962

 
$
6,180

 
$
1,766

 
$
39,022

 
 
 
 
 
 
 
 
 
 
 
Loss-sharing expiration dates:
 
 
 
 
 
 
 
 
 
 
Non-single family
 
First Quarter 2015
 
First Quarter 2015
 
Second Quarter 2016
 
Second Quarter 2016
 
 
Single family
 
First Quarter 2020
 
First Quarter 2020
 
Second Quarter 2021
 
Second Quarter 2021
 
 
Loss recovery expiration dates:
 
 
 
 
 
 
 
 
 
 
Non-single family
 
First Quarter 2018
 
First Quarter 2018
 
Second Quarter 2019
 
Second Quarter 2019
 
 
Single family
 
First Quarter 2020
 
First Quarter 2020
 
Second Quarter 2021
 
Second Quarter 2021
 
 
v3.3.1.900
Premises and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Premises and Equipment
Premises and Equipment
Real and personal property and software, less accumulated depreciation and amortization, were as follows:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Land
 
$
51,446

 
$
52,338

Buildings
 
102,808

 
103,240

Leasehold improvements
 
20,604

 
21,199

Furniture and equipment
 
28,662

 
28,486

Vehicles
 
587

 
596

Computer software
 
17,294

 
15,666

Total cost
 
221,401

 
221,525

Less accumulated depreciation and amortization
 
(57,162
)
 
(49,435
)
Total
 
$
164,239

 
$
172,090


Total depreciation and amortization expense was $12.3 million, $10.9 million, and $10.2 million, for the years ended December 31, 2015, 2014, and 2013, respectively.
In 2015, the Company committed to a plan to abandon a long-lived asset acquired in the Intermountain transaction. The Company tested the asset for recoverability and no impairment loss was indicated. In conjunction with the recoverability test, the Company determined the asset would be abandoned before the end of its previously estimated useful life and revised its depreciation estimates accordingly. The total expected after tax expense related this activity is $2.1 million. For the current period, the revision resulted in a $514 thousand reduction to net income which was recorded to the line item Occupancy in the consolidated statements of income. The remaining after-tax expense of $1.6 million is expected to be incurred in the first quarter of 2016.
v3.3.1.900
Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Other Intangible Assets
In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances such as upon material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 31, 2015 and concluded that there was no impairment. As of December 31, 2015 we determined there were no events or circumstances which would more likely than not reduce the fair value of our reporting unit below its carrying amount.
The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of 10 years.
The following table sets forth activity for goodwill and other intangible assets for the period:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Goodwill, beginning of period
 
$
382,537

 
$
343,952

 
$
115,554

Established through acquisitions and provisional period adjustments (1)
 
225

 
38,585

 
228,398

Total goodwill, end of period
 
382,762

 
382,537

 
343,952

Other intangible assets, net
 
 
 
 
 
 
Core deposit intangible:
 
 
 
 
 
 
Gross core deposit intangible balance, beginning of period
 
58,598

 
47,698

 
32,441

Accumulated amortization, beginning of period
 
(29,058
)
 
(22,765
)
 
(16,720
)
Core deposit intangible, net, beginning of period
 
29,540

 
24,933

 
15,721

Established through acquisitions
 
—

 
10,900

 
15,257

CDI current period amortization
 
(6,882
)
 
(6,293
)
 
(6,045
)
Total core deposit intangible, end of period
 
22,658

 
29,540

 
24,933

Intangible assets not subject to amortization
 
919

 
919

 
919

Other intangible assets, net at end of period
 
23,577

 
30,459

 
25,852

Total goodwill and intangible assets, end of period
 
$
406,339

 
$
412,996

 
$
369,804


__________
(1) See Note 2, Business Combinations, for additional information regarding the current period adjustment to goodwill related to the acquisition of Intermountain on November 1, 2014.
The following table provides the estimated future amortization expense of core deposit intangibles for the succeeding five years:
 
Years Ending December 31,
 
(in thousands)
2016
 
$
5,945

2017
 
4,913

2018
 
3,855

2019
 
2,951

2020
 
2,048
v3.3.1.900
Deposits
 12 Months Ended
Dec. 31, 2015
Deposits [Abstract]  
Deposits
Deposits
Year-end deposits are summarized in the following table:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Core deposits:
 
 
 
 
Demand and other noninterest-bearing
 
$
3,507,358

 
$
2,651,373

Interest-bearing demand
 
925,909

 
1,304,258

Money market
 
1,788,552

 
1,760,331

Savings
 
657,016

 
615,721

Certificates of deposit less than $100,000
 
249,031

 
288,261

Total core deposits
 
7,127,866

 
6,619,944

Certificates of deposit greater than $100,000
 
182,973

 
202,014

Certificates of deposit insured through CDARS®
 
26,901

 
18,429

Brokered money market accounts
 
100,854

 
83,402

Subtotal
 
7,438,594

 
6,923,789

Valuation adjustment resulting from acquisition accounting
 
235

 
933

Total deposits
 
$
7,438,829

 
$
6,924,722


Overdrafts of $1.8 million and $1.3 million were reclassified as loan balances at December 31, 2015 and 2014, respectively.
The following table shows the amount and maturity of time deposits that had balances of $100,000 or greater:
 
Years Ending December 31,
 
(in thousands)
2016
 
$
168,149

2017
 
25,703

2018
 
4,837

2019
 
4,161

2020
 
6,803

Thereafter
 
221

Total
 
$
209,874
v3.3.1.900
Federal Home Loan Bank and Federal Reserve Bank Borrowings
 12 Months Ended
Dec. 31, 2015
Federal Home Loan Bank and Federal Reserve Bank Borrowings [Abstract]  
Federal Home Loan Bank and Federal Reserve Bank Borrowings [Text Block]
Federal Home Loan Bank and Federal Reserve Bank Borrowings
FEDERAL HOME LOAN BANK
The Company has entered into borrowing arrangements with the FHLB of Des Moines (“FHLB”) to borrow funds under a short-term floating rate fed funds overnight advance program and fixed-term loan agreements. All borrowings are secured by stock of the FHLB and a blanket pledge of qualifying loans receivable. At December 31, 2015 FHLB advances were scheduled to mature as follows:
 
 
Federal Home Loan Bank Advances
Fixed rate advances
 
 
Weighted Average Rate
 
Amount
 
 
(dollars in thousands)
Within 1 year
 
0.34
%
 
$
62,000

Over 1 through 5 years
 
5.66
%
 
1,000

Due after 10 years
 
5.37
%
 
5,000

Total
 
68,000

Valuation adjustment from acquisition accounting
 
531

Total
 
$
68,531


The maximum, average outstanding and year-end balances and average interest rates on advances from the FHLB were as follows for the years ended December 31, 2015, 2014 and 2013:
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
 
 
(dollars in thousands)
Balance at end of year
 
$
68,531

 
$
216,568

 
$
36,606

Average balance during the year
 
$
70,678

 
$
44,876

 
$
51,030

Maximum month-end balance during the year
 
$
242,556

 
$
216,568

 
$
190,631

Weighted average rate during the year
 
0.68
%
 
0.74
%
 
1.12
%
Weighted average rate at December 31
 
0.79
%
 
0.41
%
 
1.09
%

FHLB advances are collateralized by the following:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Recorded value of blanket pledge on loans receivable
 
$
1,399,201

 
$
1,083,879

Total
 
$
1,399,201

 
$
1,083,879

FHLB borrowing capacity
 
$
1,328,971

 
$
865,138


FEDERAL RESERVE BANK
The Company is also eligible to borrow under the Federal Reserve Bank’s primary credit program, including the Term Auction Facility auctions. All borrowings are secured by certain pledged available for sale investment securities.
Although the Company has not had FRB borrowings in the last three years, the Company pledges securities and loans for borrowing capacity at the Federal Reserve Bank.
The following table shows amounts pledged to the Federal Reserve Bank:
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Fair value of investment securities
 
$
47,516

 
$
40,128

Recorded value of pledged commercial loans
 
37,912

 
46,002

Total
 
$
85,428

 
$
86,130

Federal Reserve Bank borrowing capacity
 
$
85,428

 
$
86,130
v3.3.1.900
Securities Sold Under Agreements to Repurchase
 12 Months Ended
Dec. 31, 2015
Securities Sold under Agreements to Repurchase [Abstract]  
Securities sold under agreements to repurchase
Securities Sold Under Agreements to Repurchase - Term
The Company has entered into wholesale repurchase agreements with certain brokers. At December 31, 2015 and 2014, the Company held $25.0 million in wholesale repurchase agreements with an interest rate of 1.88%. Securities available for sale with a carrying amount of $28.2 million at December 31, 2015 were pledged as collateral for the repurchase agreement borrowings. The broker holds the securities while the Company continues to receive the principal and interest payments from the securities. Upon maturity of the agreement in 2018, the pledged securities will be returned to the Company.
Securities Sold Under Agreements to Repurchase - Sweep
These sweep repurchase agreements are generally short-term agreements. These agreements are treated as financing transactions and the obligations to repurchase securities sold are reflected as a liability in the consolidated financial statements. The dollar amount of securities underlying the agreements remains in the applicable asset account of the consolidated financial statements. These agreements had a balance of $74.7 million and a weighted average interest rate of 0.11% at December 31, 2015. All of these repurchase agreements in existence at December 31, 2015 mature on a daily basis. Securities available for sale with a carrying amount of $86.0 million at December 31, 2015 were pledged as collateral for the sweep repurchase agreement borrowings.
v3.3.1.900
Other Borrowings
 12 Months Ended
Dec. 31, 2015
Subordinated Borrowing [Line Items]  
Subordinated Borrowings Disclosure [Text Block]
Other Borrowings
On November 1, 2014, with its acquisition of Intermountain, the Company assumed $16.5 million of trust preferred obligations. The Company redeemed $8.3 million of these obligations during 2014. The remaining $8.2 million of obligations bore interest at a rate of 3.03%, paid quarterly. On January 7, 2015, the Company redeemed the remaining $8.2 million trust preferred obligations.
v3.3.1.900
Derivatives and Balance Sheet Offsetting
 12 Months Ended
Dec. 31, 2015
General Discussion of Derivative Instruments and Hedging Activities [Abstract]  
Derivatives and Balance Sheet Offsetting
Derivatives and Balance Sheet Offsetting
The Company periodically enters into certain commercial loan interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan agreement with a customer in addition to a swap agreement. This swap agreement effectively converts the customer’s variable rate loan into a fixed rate. The Company then enters into a corresponding swap agreement with a third party in order to offset its exposure on the variable and fixed components of the customer agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the instruments are marked to market in earnings. The notional amount of open interest rate swap agreements at December 31, 2015 and 2014 was $264.4 million and $215.6 million, respectively. During 2015 a mark-to-market gain of $11 thousand was recorded and during 2014 a mark-to-market loss of $51 thousand was recorded, both to other noninterest expense. There was no earnings impact for the year ending December 31, 2013.
The following table presents the fair value and balance sheet classification of derivatives not designated as hedging instruments at December 31, 2015 and 2014:
 
Asset Derivatives
 
Liability Derivatives
 
2015
 
2014
 
2015
 
2014
(in thousands)
Balance Sheet
Location
 
Fair Value
 
Balance Sheet
Location
 
Fair Value
 
Balance Sheet
Location
 
Fair Value
 
Balance Sheet
Location
 
Fair Value
Interest rate contracts
Other assets
 
$
12,438

 
Other assets
 
$
11,800

 
Other liabilities
 
$
12,478

 
Other liabilities
 
$
11,851

The Company is party to interest rate swap agreements and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the consolidated balance sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.
 
Gross Amounts of Recognized Assets/Liabilities
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets
 
Gross Amounts Not Offset in the Consolidated Balance Sheets
 
 
 
 
Collateral Posted
 
Net Amount
December 31, 2015
(in thousands)
Assets
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
12,438

 
$
—

 
$
12,438

 
$
—

 
$
12,438

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
12,478

 
$
—

 
$
12,478

 
$
(12,478
)
 
$
—

Repurchase agreements
$
99,699

 
$
—

 
$
99,699

 
$
(99,699
)
 
$
—

 
 
 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
11,800

 
$
—

 
$
11,800

 
$
—

 
$
11,800

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
11,851

 
$
—

 
$
11,851

 
$
(11,851
)
 
$
—

Repurchase agreements
$
105,080

 
$
—

 
$
105,080

 
$
(105,080
)
 
$
—


The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:
 
 
Remaining contractual maturity of the agreements
 
 
Overnight and continuous
 
Up to 30 days
 
30 - 90 days
 
Greater than 90 days
 
Total
December 31, 2015
 
(in thousands)
Class of collateral pledged for repurchase agreements
 
 
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
74,699

 
$
—

 
$
—

 
$
25,000

 
$
99,699

Gross amount of recognized liabilities for repurchase agreements
 
99,699

Amounts related to agreements not included in offsetting disclosure
 
$
—


The collateral utilized for the Company’s repurchase agreements is subject to market fluctuations as well as prepayments of principal. The Company monitors the risk of the fair value of its pledged collateral falling below acceptable amounts based on the type of the underlying repurchase agreement. The pledged collateral related to the Company’s term wholesale repurchase agreement, which matures in 2018, is monitored on a monthly basis and additional capital is pledged when necessary. The pledged collateral related to the Company’s sweep repurchase agreements, which mature on a daily basis, is monitored on a daily basis as the underlying sweep accounts can have daily transaction activity and the amount of pledged collateral is adjusted as necessary.
v3.3.1.900
Employee Benefit Plans
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
401(k) Plan
The Company maintains defined contribution and profit sharing plans in conformity with the provisions of section 401(k) of the Internal Revenue Code. The Columbia Bank 401(k) and Profit Sharing Plan (the “401(k) Plan”), permits eligible Columbia Bank employees, those who are at least 18 years of age and have completed three months of service, to contribute up to 75% of their eligible compensation to the 401(k) Plan. On a per pay period basis the Company is required to match 50% of employee contributions up to 3% of each employee’s eligible compensation. The Company contributed $2.3 million during 2015, $2.0 million during 2014, and $1.9 million during 2013, in matching funds to the 401(k) Plan. Additionally, as determined annually by the board of directors of the Company, the 401(k) Plan provides for a non-matching discretionary profit sharing contribution. The Company’s discretionary profit sharing contributions were $5.2 million during 2015, $4.4 million during 2014 and $4.0 million during 2013.
Employee Stock Purchase Plan
The Company maintains an “Employee Stock Purchase Plan” (the “ESP Plan”) in which substantially all employees of the Company are eligible to participate. The ESP Plan provides participants the opportunity to purchase common stock of the Company at a discounted price. Under the ESP Plan, participants can purchase common stock of the Company for 90% of the lowest price on either the first or last day in each of two six month look-back periods. The look-back periods are January 1st through June 30th and July 1st through December 31st of each calendar year. The 10% discount is recognized by the Company as compensation expense and does not have a material impact on net income or earnings per common share. Participants of the ESP Plan purchased 42,134 shares for $1.2 million in 2015, 34,168 shares for $904 thousand in 2014 and 32,598 shares for $686 thousand in 2013. At December 31, 2015 there were 499,610 shares available for purchase under the ESP plan.
Supplemental Compensation Plan
The Company maintains supplemental compensation arrangements (“Unit Plans”) to provide benefits for certain employees. The Unit Plans generally vest over a 4-10 year period and provide a fixed annual benefit over a 5-10 year period. At December 31, 2015 and 2014 the liability associated with these plans was $4.9 million and $4.8 million, respectively. Expense associated with these plans for the years ended December 31, 2015, 2014 and 2013 was $859 thousand, $588 thousand and $458 thousand, respectively.
Supplemental Executive Retirement Plan
The Company maintains a supplemental executive retirement plan (the “SERP”), a nonqualified deferred compensation plan that provides retirement benefits to certain highly compensated executives. The SERP is unsecured and unfunded and there are no program assets. The SERP projected benefit obligation, which represents the vested net present value of future payments to individuals under the plan is accrued over the estimated remaining term of employment of the participants and has been determined by actuarial valuation using “RP-2014 Adjusted to 2006 Total Dataset Mortality Table with Scale MP-2015 projected to 2026” for the mortality assumptions and discount rate of 4.26% for 2015 and 5.10% for 2014. Additional assumptions and features of the plan are a normal retirement age of 65 and a 2% annual cost of living benefit adjustment. The projected benefit obligation is included in other liabilities on the Consolidated Balance Sheets.
The following table reconciles the accumulated liability for the projected benefit obligation:  
 
 
December 31,
2015
 
2014
 
 
(in thousands)
Balance at beginning of year
 
$
16,541

 
$
16,423

Established through acquisitions
 
—

 
511

Change in actuarial loss
 
4,874

 
—

Plan amendments
 
2,617

 
—

Benefit expense
 
2,491

 
1,325

Benefit payments
 
(979
)
 
(1,718
)
Balance at end of year
 
$
25,544

 
$
16,541


The benefits expected to be paid in conjunction with the SERP are presented in the following table:
 
Years Ending December 31,
 
(in thousands)
2016
 
$
994

2017
 
1,128

2018
 
1,510

2019
 
1,548

2020
 
2,568

2021 through 2025
 
10,492

Total
 
$
18,240
v3.3.1.900
Commitments and Contingent Liabilities
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingent Liabilities
Commitments and Contingent Liabilities
Lease Commitments: The Company leases locations as well as equipment under various non-cancellable operating leases that expire between 2016 and 2043. The majority of the leases contain renewal options and provisions for increases in rental rates based on an agreed upon index or predetermined escalation schedule. As of December 31, 2015, minimum future rental payments, exclusive of taxes and other charges, of these leases were: 
Years Ending December 31,
 
(in thousands)
2016
 
$
6,774

2017
 
5,621

2018
 
4,983

2019
 
4,606

2020
 
3,810

Thereafter
 
13,968

Total minimum payments
 
$
39,762


Total rental expense on buildings and equipment, net of rental income of $1.1 million, $756 thousand and $673 thousand, was $7.4 million, $8.3 million and $8.5 million, for the years ended December 31, 2015, 2014 and 2013, respectively.
Financial Instruments with Off-Balance Sheet Risk: In the normal course of business, the Company makes loan commitments (typically unfunded loans and unused lines of credit) and issues standby letters of credit to accommodate the financial needs of its customers.
Standby letters of credit commit the Company to make payments on behalf of customers under specified conditions. Historically, no significant losses have been incurred by the Company under standby letters of credit. Both arrangements have credit risk essentially the same as that involved in extending loans to customers and are subject to the Company’s normal credit policies, including collateral requirements, where appropriate. At December 31, 2015 and 2014, the Company’s loan commitments amounted to $1.93 billion and $1.58 billion, respectively. Standby letters of credit were $38.7 million and $36.7 million at December 31, 2015 and 2014, respectively. In addition, commitments under commercial letters of credit used to facilitate customers’ trade transactions and other off-balance sheet liabilities amounted to $5.0 million and $4.4 million at December 31, 2015 and 2014, respectively.
Legal Proceedings: The Company and its subsidiaries are from time to time defendants in and are threatened with various legal proceedings arising from their regular business activities. Management, after consulting with legal counsel, is of the opinion that the ultimate liability, if any, resulting from these pending or threatened actions and proceedings will not have a material effect on the financial statements of the Company.
v3.3.1.900
Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2015
Accumulated Other Comprehensive Income [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Accumulated Other Comprehensive Income
The following table shows changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2015, 2014 and 2013:
 
 
Unrealized Gains and Losses on Available-for-Sale Securities (1)
 
Unrealized Gains and Losses on Pension Plan Liability (1)
 
Total (1)
Year Ended December 31, 2015
 
(in thousands)
Beginning balance
 
$
7,462

 
$
(1,841
)
 
$
5,621

Other comprehensive loss before reclassifications
 
(6,069
)
 
(5,054
)
 
(11,123
)
Amounts reclassified from accumulated other comprehensive income (2)
 
(1,007
)
 
214

 
(793
)
Net current-period other comprehensive loss
 
(7,076
)
 
(4,840
)
 
(11,916
)
Ending balance
 
$
386

 
$
(6,681
)
 
$
(6,295
)
Year Ended December 31, 2014
 
 
 
 
 
 
Beginning balance
 
$
(10,108
)
 
$
(1,936
)
 
$
(12,044
)
Other comprehensive income before reclassifications
 
17,922

 
—

 
17,922

Amounts reclassified from accumulated other comprehensive income (2)
 
(352
)
 
95

 
(257
)
Net current-period other comprehensive income
 
17,570

 
95

 
17,665

Ending balance
 
$
7,462

 
$
(1,841
)
 
$
5,621

Year Ended December 31, 2013
 
 
 
 
 
 
Beginning balance
 
$
20,918

 
$
(769
)
 
$
20,149

Other comprehensive loss before reclassifications
 
(30,727
)
 
(1,432
)
 
(32,159
)
Amounts reclassified from accumulated other comprehensive income (2)
 
(299
)
 
265

 
(34
)
Net current-period other comprehensive loss
 
(31,026
)
 
(1,167
)
 
(32,193
)
Ending balance
 
$
(10,108
)
 
$
(1,936
)
 
$
(12,044
)
__________
(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
(2) See following table for details about these reclassifications.
The following table shows details regarding the reclassifications from accumulated other comprehensive income for the years ended December 31, 2015, 2014 and 2013:
 
 
Amount Reclassified from Accumulated Other Comprehensive Income
 
Affected line Item in the Consolidated Statement of Income
 
 
Years Ended
 
 
 
 
December 31, 2015
 
December 31, 2014
 
December 31, 2013
 
 
 
 
(in thousands)
 
 
Unrealized gains and losses on available-for-sale securities
 
$
1,581

 
$
552

 
$
462

 
Investment securities gains, net
 
 
1,581

 
552

 
462

 
Total before tax
 
 
(574
)
 
(200
)
 
(163
)
 
Income tax provision
 
 
$
1,007

 
$
352

 
$
299

 
Net of tax
 
 
 
 
 
 
 
 
 
Amortization of pension plan liability
actuarial losses
 
$
(336
)
 
$
(149
)
 
$
(400
)
 
Compensation and employee benefits
 
 
(336
)
 
(149
)
 
(400
)
 
Total before tax
 
 
122

 
54

 
135

 
Income tax benefit
 
 
$
(214
)
 
$
(95
)
 
$
(265
)
 
Net of tax
v3.3.1.900
Shareholders' Equity
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders’ Equity
Preferred Stock. In conjunction with the 2013 acquisition of West Coast, the Company issued 8,782 shares of mandatorily convertible cumulative participating preferred stock, Series B (“Series B Preferred Stock”). The Series B Preferred Stock is not subject to the operation of a sinking fund. The Series B Preferred Stock is not redeemable by the Company and is perpetual with no maturity. The holders of Series B Preferred Stock have no general voting rights. If the Company declares and pays a dividend to its common shareholders, it must declare and pay to its holders of Series B Preferred Stock, on the same date, a dividend in an amount per share of the Series B Preferred Stock that is intended to provide such holders dividends in the amount they would have received if shares of Series B Preferred Stock had been converted into common stock as of that date. The outstanding shares of Series B Preferred Stock are convertible into 102,363 shares of Company common stock.
Dividends. On January 29, 2015, the Company declared a quarterly cash dividend of $0.16 per common share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.14 per common share and common share equivalent for holders of preferred stock, both payable on February 25, 2015 to shareholders of record as of the close of business on February 11, 2015.
On April 22, 2015 the Company declared a quarterly cash dividend of $0.18 per common share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.16 per common share and common share equivalent for holders of preferred stock, both payable on May 20, 2015 to shareholders of record at the close of business on May 6, 2015.
On July 23, 2015 the Company declared a quarterly cash dividend of $0.18 per common share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.16 per common share and common share equivalent for holders of preferred stock, both payable on August 19, 2015 to shareholders of record at the close of business on August 5, 2015.
On October 29, 2015 the Company declared a quarterly cash dividend of $0.18 per share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.18 per common share and common share equivalent for holders of preferred stock, both payable on November 25, 2015 to shareholders of record at the close of business on November 11, 2015.
Subsequent to year end, on January 28, 2016 the Company declared a quarterly cash dividend of $0.18 per share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.20 per common share and common share equivalent for holders of preferred stock, both payable on February 24, 2016, to shareholders of record at the close of business on February 10, 2016.
The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements.
v3.3.1.900
Fair Value Accounting and Measurement
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Accounting and Measurement
Fair Value Accounting and Measurement
The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available.
The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy:
Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date.
Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable.
Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable.
Fair values are determined as follows:
Securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all securities other than U.S. Treasury notes, which are considered a Level 1 input method.
Interest rate contract positions are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy.
The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at December 31, 2015 and 2014 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
 
 
Fair value  at
December 31, 2015
 
Fair Value Measurements at Reporting Date Using
 
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
Securities available for sale
 
 
 
 
 
 
 
 
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations
 
$
1,286,489

 
$
—

 
$
1,286,489

 
$
—

State and municipal securities
 
492,169

 
—

 
492,169

 
—

U.S. government agency and government-sponsored enterprise securities
 
353,782

 
—

 
353,782

 
—

U.S. government securities
 
20,137

 
20,137

 
—

 
—

Other securities
 
5,117

 
—

 
5,117

 
—

Total securities available for sale
 
$
2,157,694

 
$
20,137

 
$
2,137,557

 
$
—

Other assets (Interest rate contracts)
 
$
12,438

 
$
—

 
$
12,438

 
$
—

Liabilities
 
 
 
 
 
 
 
 
Other liabilities (Interest rate contracts)
 
$
12,478

 
$
—

 
$
12,478

 
$
—

 
 
Fair value  at
December 31, 2014
 
Fair Value Measurements at Reporting Date Using
 
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
Securities available for sale
 
 
 
 
 
 
 
 
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations
 
$
1,162,387

 
$
—

 
$
1,162,387

 
$
—

State and municipal debt securities
 
496,484

 
—

 
496,484

 
—

U.S. government agency and government-sponsored enterprise securities
 
413,706

 
—

 
413,706

 
—

U.S. government securities
 
20,499

 
20,499

 
—

 
—

Other securities
 
5,181

 
—

 
5,181

 
—

Total securities available for sale
 
$
2,098,257

 
$
20,499

 
$
2,077,758

 
$
—

Other assets (Interest rate contracts)
 
$
11,800

 
$
—

 
$
11,800

 
$
—

Liabilities
 
 
 
 
 
 
 
 
Other liabilities (Interest rate contracts)
 
$
11,851

 
$
—

 
$
11,851

 
$
—


There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the years ended December 31, 2015 and 2014. The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period.
Nonrecurring Measurements
Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument:
Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. Generally, the Company utilizes the fair market value of the collateral to measure impairment. The impairment evaluations are performed in conjunction with the ALLL process on a quarterly basis by officers in the Special Credits group, which reports to the Chief Credit Officer. The Real Estate Appraisal Services Department (“REASD”), which also reports to the Chief Credit Officer, is responsible for obtaining appraisals from third-parties or performing internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy, and reasonableness.
Other real estate owned —OREO is real property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO is generally measured based on the property’s fair market value as indicated by an appraisal or a letter of intent to purchase. OREO is initially recorded at the fair value less estimated costs to sell. This amount becomes the property’s new basis. Any fair value adjustments based on the property’s fair value less estimated costs to sell at the date of acquisition are charged to the ALLL, or in the event of a write-up without previous losses charged to the ALLL, a credit to earnings is recorded. Management periodically reviews OREO in an effort to ensure the property is recorded at its fair value, net of estimated costs to sell. Any fair value adjustments subsequent to acquisition are charged or credited to earnings. The initial and subsequent evaluations are performed by officers in the Special Credits group, which reports to the Chief Credit Officer. The REASD obtains appraisals from third-parties for OREO and performs internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy, and reasonableness.
The following table sets forth the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the years ended December 31, 2015 and 2014:
 
 
Fair value  at
December 31, 2015
 
Fair Value Measurements at Reporting Date Using
 
Losses During the Year Ended
December 31, 2015
 
 
Level 1
 
Level 2
 
Level 3
 
 
 
(in thousands)
Impaired loans
 
$
758

 
$
—

 
$
—

 
$
758

 
$
653

OREO
 
4,524

 
—

 
—

 
4,524

 
949

 
 
$
5,282

 
$
—

 
$
—

 
$
5,282

 
$
1,602

 
 
Fair value  at
December 31, 2014
 
Fair Value Measurements at Reporting Date Using
 
Losses During the Year Ended
December 31, 2014
 
 
Level 1
 
Level 2
 
Level 3
 
 
 
(in thousands)
OREO
 
$
5,365

 
$
—

 
$
—

 
$
5,365

 
$
1,008

 
 
$
5,365

 
$
—

 
$
—

 
$
5,365

 
$
1,008



The losses on impaired loans disclosed above represent the amount of the specific reserve and/or charge-offs during the period applicable to loans held at period end. For 2014, there were no losses recorded during the period to loans still held at period end. The amount of the specific reserve is included in the allowance for loan and lease losses. The losses on OREO disclosed above represent the write-downs taken at foreclosure that were charged to the allowance for loan and lease losses, as well as subsequent changes in any valuation allowances from updated appraisals that were recorded to earnings.
Quantitative information about Level 3 fair value measurements
The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets during 2015 and 2014, along with the valuation techniques used, are shown in the following tables:
 
 
Fair value  at
December 31, 2015
 
Valuation Technique
 
Unobservable Input
 
Range (Weighted Average) (1)
 
 
(dollars in thousands)
Impaired loans - real estate collateral
 
$
380

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
Impaired loans - other collateral (3)
 
378

 
Fair Market Value of Collateral
 
Adjustment to Stated Value
 
N/A (2)
OREO
 
4,524

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of equipment and life insurance).
(2) Quantitative disclosures are not provided because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of equipment and life insurance.

 
 
Fair value  at
December 31, 2014
 
Valuation Technique
 
Unobservable Input
 
Range (Weighted Average) (1)
 
 
(dollars in thousands)
OREO
 
$
5,365

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal value during the current period.


Fair value of financial instruments
Because broadly traded markets do not exist for most of the Company’s financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. These determinations are subjective in nature, involve uncertainties and matters of significant judgment and do not include tax ramifications; therefore, the results cannot be determined with precision, substantiated by comparison to independent markets and may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein do not represent, and should not be construed to represent, the underlying value of the Company.
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Cash and due from banks and interest-earning deposits with banks—The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value that approximates carrying value (Level 1).
Securities available for sale—Securities at fair value, other than U.S. Treasury Notes, are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors (Level 2). U.S. Treasury Notes are priced using quotes in active markets (Level 1).
Federal Home Loan Bank stock—The fair value is based upon the par value of the stock which equates to its carrying value (Level 2).
Loans held for sale—The carrying amount of loans held for sale approximates their fair values due to the short period of time between the origination and sales dates (Level 2).
Loans—Loans are not recorded at fair value on a recurring basis. Nonrecurring fair value adjustments are periodically recorded on impaired loans that are measured for impairment based on the fair value of collateral. For most performing loans, fair value is estimated using expected duration and lending rates that would have been offered on December 31, 2015 or 2014 for loans which mirror the attributes of the loans with similar rate structures and average maturities. The fair values resulting from these calculations are reduced by an amount representing the change in estimated fair value attributable to changes in borrowers’ credit quality since the loans were originated. For nonperforming loans, fair value is estimated by applying a valuation discount based upon loan sales data from the FDIC. For PCI loans, fair value is estimated by discounting the expected future cash flows using a lending rate that would have been offered on December 31, 2015 (Level 3).
FDIC loss-sharing asset —The fair value of the FDIC loss-sharing asset is estimated based on discounting the expected future cash flows using an estimated market rate (Level 3).
Interest rate contracts—Interest rate contracts are valued in models, which use readily observable market parameters as their basis (Level 2).
Deposits—For deposits with no contractual maturity, the fair value is equal to the carrying value (Level 1). The fair value of fixed maturity deposits is based on discounted cash flows using the difference between the deposit rate and current market rates for deposits of similar remaining maturities (Level 2).
FHLB advances—The fair value of FHLB advances is estimated based on discounting the future cash flows using the market rate currently offered (Level 2).
Repurchase agreements—The fair value of term repurchase agreements is estimated based on discounting the future cash flows using the market rate currently offered. The carrying amount of sweep repurchase agreements approximates their fair values due to the short period of time between repricing dates (Level 2).
Other Borrowings— Other borrowings are trust preferred obligations assumed by the Company in the Intermountain acquisition. The fair value is estimated as the carrying value as these obligations are redeemable and a market participant would expect redemption in the near-term. On January 7, 2015, the Company redeemed all remaining trust preferred obligations (Level 2).
Other financial instruments—The majority of our commitments to extend credit and standby letters of credit carry current market interest rates if converted to loans, as such, carrying value is assumed to equal fair value.
The following tables summarize carrying amounts and estimated fair values of selected financial instruments for the periods indicated:
 
 
 
December 31,
2015
 
 
Carrying
Amount
 
Fair
Value
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
 
$
166,929

 
$
166,929

 
$
166,929

 
$
—

 
$
—

Interest-earning deposits with banks
 
8,373

 
8,373

 
8,373

 
—

 
—

Securities available for sale
 
2,157,694

 
2,157,694

 
20,137

 
2,137,557

 
—

FHLB stock
 
12,722

 
12,722

 
—

 
12,722

 
—

Loans held for sale
 
4,509

 
4,509

 
—

 
4,509

 
—

Loans
 
5,746,855

 
5,752,423

 
—

 
—

 
5,752,423

FDIC loss-sharing asset
 
6,568

 
921

 
—

 
—

 
921

Interest rate contracts
 
12,438

 
12,438

 
—

 
12,438

 
—

Liabilities
 
 
 
 
 
 
 
 
 
 
Deposits
 
$
7,438,829

 
$
7,434,787

 
$
6,979,924

 
$
454,863

 
$
—

FHLB advances
 
68,531

 
69,176

 
—

 
69,176

 
—

Repurchase agreements
 
99,699

 
100,346

 
—

 
100,346

 
—

Interest rate contracts
 
12,478

 
12,478

 
—

 
12,478

 
—


 
 
December 31,
2014
 
 
Carrying
Amount
 
Fair
Value
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
 
$
171,221

 
$
171,221

 
$
171,221

 
$
—

 
$
—

Interest-earning deposits with banks
 
16,949

 
16,949

 
16,949

 
—

 
—

Securities available for sale
 
2,098,257

 
2,098,257

 
20,499

 
2,077,758

 
—

FHLB stock
 
33,365

 
33,365

 
—

 
33,365

 
—

Loans held for sale
 
1,116

 
1,116

 
—

 
1,116

 
—

Loans
 
5,375,809

 
5,516,286

 
—

 
—

 
5,516,286

FDIC loss-sharing asset
 
15,174

 
4,054

 
—

 
—

 
4,054

Interest rate contracts
 
11,800

 
11,800

 
—

 
11,800

 
—

Liabilities
 
 
 
 
 
 
 
 
 
 
Deposits
 
$
6,924,722

 
$
6,921,804

 
$
6,416,017

 
$
505,787

 
$
—

FHLB advances
 
216,568

 
217,296

 
—

 
217,296

 
—

Repurchase agreements
 
105,080

 
106,171

 
—

 
106,171

 
—

Other borrowings
 
8,248

 
8,248

 
—

 
8,248

 
—

Interest rate contracts
 
11,851

 
11,851

 
—

 
11,851

 
—
v3.3.1.900
Earnings Per Common Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Common Share
Earnings per Common Share
The Company applies the two-class method of computing basic and diluted EPS. Under the two-class method, EPS is determined for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. The Company issues restricted shares under share-based compensation plans and preferred shares which qualify as participating securities.
The following table sets forth the computation of basic and diluted earnings per share for the periods indicated:
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands except per share)
Basic EPS:
 
 
 
 
 
 
Net income
 
$
98,827

 
$
81,574

 
$
60,016

Less: Earnings allocated to participating securities
 
 
 
 
 
 
Preferred shares
 
175

 
157

 
95

Nonvested restricted shares
 
1,075

 
780

 
523

Earnings allocated to common shareholders
 
$
97,577

 
$
80,637

 
$
59,398

Weighted average common shares outstanding
 
57,019

 
52,618

 
47,993

Basic earnings per common share
 
$
1.71

 
$
1.53

 
$
1.24

Diluted EPS:
 
 
 
 
 
 
Earnings allocated to common shareholders (1)
 
$
97,577

 
$
80,640

 
$
59,407

Weighted average common shares outstanding
 
57,019

 
52,618

 
47,993

Dilutive effect of equity awards and warrants
 
13

 
565

 
1,058

Weighted average diluted common shares outstanding
 
57,032

 
53,183

 
49,051

Diluted earnings per common share
 
$
1.71

 
$
1.52

 
$
1.21

Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive
 
37

 
64

 
64


 __________
(1)
Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.
v3.3.1.900
Share-Based Payments
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Payments
Share-Based Payments
At December 31, 2015, the Company had one equity compensation plan (the “Plan”), which is shareholder approved, that provides for the granting of share options and shares to eligible employees and directors up to 1,800,000 shares.
Share Awards: Restricted share awards provide for the immediate issuance of shares of Company common stock to the recipient, with such shares held in escrow until certain service conditions are met, generally four years of continual service. Recipients of restricted shares do not pay any cash consideration to the Company for the shares, have the right to vote all shares subject to such grant, and receive all dividends with respect to such shares, whether or not the shares have vested. The fair value of share awards is equal to the fair market value of the Company’s common stock on the date of grant.
A summary of changes in the Company’s nonvested shares and related information for the years ended December 31, 2015, 2014 and 2013 is presented below:
 
Nonvested Shares
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested at January 1, 2013
 
384,090

 
$
19.54

Granted
 
203,441

 
$
20.78

Vested
 
(117,153
)
 
$
16.90

Forfeited
 
(59,780
)
 
$
20.24

Nonvested at December 31, 2013
 
410,598

 
$
20.79

Granted
 
246,068

 
$
25.97

Vested
 
(108,371
)
 
$
21.45

Forfeited
 
(28,510
)
 
$
21.92

Nonvested at December 31, 2014
 
519,785

 
$
23.03

Granted
 
306,007

 
$
28.57

Vested
 
(131,775
)
 
$
21.55

Forfeited
 
(28,315
)
 
$
24.79

Nonvested at December 31, 2015
 
665,702

 
$
25.80


As of December 31, 2015, there was $9.6 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan. That cost is expected to be recognized over a weighted average period of 2.3 years. The total fair value, as measured on the date of vesting, of shares vested during the years ended December 31, 2015, 2014, and 2013 was $2.8 million, $2.3 million, and $2.5 million, respectively.
Share Options: Option awards are generally granted with an exercise price equal to the market price of the Company’s stock at the date of grant; those option awards generally vest based on three years of continual service and are exercisable for a five-year period after vesting. Option awards granted have a 10-year maximum term.
The fair value of each option award is estimated on the date of grant using the Black-Scholes option valuation model. The fair value of all options is amortized on a straight-line basis over the requisite service periods, which are generally the vesting periods. The expected life of options granted represents the period of time that they are expected to be outstanding. The expected life is determined based on historical experience with similar awards, giving consideration to the contractual terms and vesting schedules. Expected volatilities of our common stock are estimated at the date of grant based on the historical volatility of the stock. The volatility factor is based on historical stock prices over the most recent period commensurate with the estimated expected life of the award. The risk-free interest rate is based on the U.S. Treasury curve in effect at the time of the award. The expected dividend yield is based on dividend trends and the market value of the Company’s stock price at the time of the award.

A summary of option activity under the Plan as of December 31, 2015, and changes during the year then ended is presented below.
Options
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
($000)
Balance at December 31, 2014
 
75,998

 
$
62.41

 
 
 
 
Forfeited
 
(6,387
)
 
$
79.60

 
 
 
 
Expired
 
(17,027
)
 
$
88.76

 
 
 
 
Exercised
 
(7,898
)
 
$
20.82

 
 
 
 
Balance at December 31, 2015
 
44,686

 
$
57.26

 
2.2
 
$
403

Vested or expected to vest at December 31, 2015
 
44,686

 
$
57.26

 
2.2
 
$
403

Total Exercisable at December 31, 2015
 
44,686

 
$
57.26

 
2.2
 
$
403


The total intrinsic value of options exercised during the years ended December 31, 2015, 2014, and 2013 was $85 thousand, $138 thousand, and $410 thousand, respectively. The weighted average grant-date fair value of options granted during the year ended December 31, 2013 was $3.06. There were no options granted during the years ended December 31, 2015 and 2014. There were no options that vested during the years ended December 2015, 2014, and 2013.
As of December 31, 2015, outstanding stock options consist of the following:
Ranges of
Exercise Prices
 
Number of
Option
Shares
 
Weighted Average
Remaining
Contractual Life
 
Weighted Average
Exercise Price of
Option Shares
 
Number of
Exercisable
Option Shares
 
Weighted Average
Exercise Price of
Exercisable Option
Shares
$0.00 - $9.99
 
17,635

 
3.3
 
$
9.91

 
17,635

 
$
9.91

$10.00 - $19.99
 
221

 
4.5
 
$
11.29

 
221

 
$
11.29

$40.00 - $49.99
 
349

 
2.5
 
$
44.49

 
349

 
$
44.49

$50.00 - $136.93
 
26,481

 
1.4
 
$
89.34

 
26,481

 
$
89.34

 
 
44,686

 
2.2
 
$
57.26

 
44,686

 
$
57.26


It is the Company’s policy to issue new shares for share option exercises and share awards. The Company expenses awards of share options and shares on a straight-line basis over the related vesting term of the award. For the years ended December 31, 2015, 2014 and 2013, the Company recognized pre-tax share-based compensation expense of $4.1 million, $2.9 million and $2.8 million, respectively.
v3.3.1.900
Income Tax
 12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Income Tax
Income Tax
The components of income tax expense are as follows:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Current tax expense
 
$
36,426

 
$
21,565

 
$
21,581

Deferred tax expense
 
6,367

 
14,646

 
5,413

Total
 
$
42,793

 
$
36,211

 
$
26,994


Significant components of the Company’s deferred tax assets and liabilities are as follows:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Deferred tax assets:
 
 
 
 
Allowance for loan and lease losses
 
$
26,024

 
$
26,341

Supplemental executive retirement plan
 
10,770

 
9,037

Stock option and restricted stock
 
1,423

 
1,177

OREO
 
813

 
1,101

Nonaccrual interest
 
69

 
68

Purchase accounting
 
9,457

 
15,272

Unrealized loss on investment securities
 
3,916

 
—

Net operating losses and credit carryforwards
 
11,467

 
14,929

Other
 
180

 
532

Total deferred tax assets
 
64,119

 
68,457

Deferred tax liabilities:
 
 
 
 
Asset purchase tax basis difference
 
(9,058
)
 
(6,595
)
FHLB stock dividends
 
(1,232
)
 
(4,086
)
Deferred loan fees
 
(5,202
)
 
(4,691
)
Unrealized gain on investment securities
 
—

 
(2,987
)
Depreciation
 
(3,730
)
 
(5,394
)
Total deferred tax liabilities
 
(19,222
)
 
(23,753
)
Net deferred tax asset
 
$
44,897

 
$
44,704


A reconciliation of the Company’s effective income tax rate with the federal statutory tax rate is as follows:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
Amount
 
Percent
 
Amount
 
Percent
 
Amount
 
Percent
 
 
(dollars in thousands)
Income tax based on statutory rate
 
$
49,567

 
35
 %
 
$
41,225

 
35
 %
 
$
30,454

 
35
 %
Reduction resulting from:
 
 
 
 
 
 
 
 
 
 
 
 
Tax exempt instruments
 
(6,761
)
 
(5
)%
 
(5,328
)
 
(5
)%
 
(4,113
)
 
(5
)%
Life insurance proceeds
 
(1,554
)
 
(1
)%
 
(1,352
)
 
(1
)%
 
(1,250
)
 
(1
)%
Acquisition costs
 
—

 
—
 %
 
448

 
—
 %
 
1,362

 
2
 %
Other, net
 
1,541

 
1
 %
 
1,218

 
2
 %
 
541

 
—
 %
Income tax provision
 
$
42,793

 
30
 %
 
$
36,211

 
31
 %
 
$
26,994

 
31
 %

As of December 31, 2015 and 2014, we had no unrecognized tax benefits. Our policy is to recognize interest and penalties on unrecognized tax benefits in “Provision for income taxes” in the Consolidated Statements of Income. There were no amounts related to interest and penalties recognized for the years ended December 31, 2015 and 2014. The tax years subject to examination by federal and state taxing authorities are the years ending December 31, 2015, 2014, 2013 and 2012. As a result of recent acquisitions, the Company has net operating loss carryforwards in the federal, Idaho and Oregon jurisdictions of $23.6 million, $32.7 million and $540 thousand, respectively, which begin to expire in 2024 and federal and Oregon credit carryforwards of $569 thousand and $1.5 million, respectively. Federal credit carryforwards are related to alternative minimum taxes and have no expiration while the Oregon credit carryforwards begin to expire in 2016. The amount of carryforwards that may be utilized annually is limited under Sections 382 and 383 as a result of changes in control. Management believes that these carryforwards will be used in the normal course of business, and as such, has not recorded a valuation allowance.
v3.3.1.900
Regulatory Capital Requirements
 12 Months Ended
Dec. 31, 2015
Regulatory Capital Requirements [Abstract]  
Regulatory Capital Requirements
Regulatory Capital Requirements
The Company (on a consolidated basis) and its banking subsidiary are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company and its banking subsidiary’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and its banking subsidiary must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies.
Basel III capital requirements became effective on January 1, 2015. The new capital requirements, among other things (i) specify that Tier 1 capital consists of “Common Equity Tier 1,” or CET1, and “Additional Tier 1 capital” instruments meeting specified requirements, (ii) define CET1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to CET1 and not to the other components of capital and (iii) expand the scope of the deductions/adjustments to capital as compared to existing regulations. Under the requirements that are now effective, the minimum capital ratios are (i) 4.5% CET1 to risk-weighted assets, (ii) 6% Tier 1 capital to risk-weighted assets, (iii) 8% total capital to risk-weighted assets and (iv) 4% Tier 1 capital to average total assets (Tier 1 leverage). The Company and the Bank have made the one-time election to opt-out of including accumulated other comprehensive income items in regulatory capital calculations.
The New Capital Rules also require a new capital conservation buffer designed to absorb losses during periods of economic stress. The capital conservation buffer is composed entirely of CET1, on top of these minimum risk-weighted asset ratios. In addition, the New Capital Rules provide for a countercyclical capital buffer applicable only to certain covered institutions. We do not expect the countercyclical capital buffer to be applicable to us or the Bank. Banking institutions with a ratio of CET1 to risk-weighted assets above the minimum but below the capital conservation buffer (or below the combined capital conservation buffer and countercyclical capital buffer, when the latter is applied) will face constraints on dividends, equity repurchases and compensation based on the amount of the shortfall.
The implementation of the capital conservation buffer began on January 1, 2016 at the 0.625% level and will be phased in over a three-year period (increasing by 0.625% on each subsequent January 1, until it reaches 2.5% on January 1, 2019). When fully phased-in, the New Capital Rules will require us, and the Bank, to maintain such additional capital conservation buffer of 2.5% of CET1, effectively resulting in minimum ratios of (i) 7% CET1 to risk-weighted assets, (ii) 8.5% Tier 1 capital to risk-weighted assets, and (iii) 10.5% total capital to risk-weighted assets. We believe that, as of December 31, 2015, we and the Bank would meet all capital adequacy requirements under the New Capital Rules on a fully phased-in basis as if all such requirements were then in effect.
FDIC regulations set forth the qualifications necessary for a bank to be classified as “well capitalized,” primarily for assignment of FDIC insurance premium rates. To qualify as “well capitalized,” banks must have a CET1 risk-adjusted capital ratio of 6.5%, a Tier I risk-adjusted capital ratio of at least 8%, a total risk-adjusted capital ratio of at least 10% and a leverage ratio of at least 5%. Failure to qualify as “well capitalized” can negatively impact a bank’s ability to expand and to engage in certain activities.
As of December 31, 2015, the most recent notification from the Federal Deposit Insurance Corporation categorized Columbia Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, an institution must maintain minimum CET1 risk-based, Tier 1 risk-based, total risk-based and Tier 1 leverage ratios as set forth in the following table. There are no conditions or events since the notification that management believes have changed Columbia Bank’s category.
The Company and its banking subsidiary’s actual capital amounts and ratios as of December 31, 2015 and 2014 are presented in the following table:
 
 
Actual
 
For Capital
Adequacy
Purposes
 
To Be Well
Capitalized Under
Prompt
Corrective Action
Provision
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
 
(dollars in thousands)
As of December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
CET1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
852,731

 
11.94
%
 
$
321,370

 
4.5
%
 
N/A

 
N/A

Columbia Bank
 
$
839,127

 
11.76
%
 
$
321,168

 
4.5
%
 
$
463,909

 
6.5
%
Tier 1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
853,182

 
11.95
%
 
$
428,493

 
6.0
%
 
N/A

 
N/A

Columbia Bank
 
$
839,127

 
11.76
%
 
$
428,223

 
6.0
%
 
$
570,965

 
8.0
%
Total Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
924,284

 
12.94
%
 
$
571,324

 
8.0
%
 
N/A

 
N/A

Columbia Bank
 
$
910,229

 
12.75
%
 
$
570,965

 
8.0
%
 
$
713,706

 
10.0
%
Tier 1 Capital Leverage (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
853,182

 
10.03
%
 
$
340,420

 
4.0
%
 
N/A

 
N/A

Columbia Bank
 
$
839,127

 
9.89
%
 
$
339,405

 
4.0
%
 
$
424,256

 
5.0
%
As of December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
Tier 1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
817,805

 
12.98
%
 
$
251,995

 
4.0
%
 
N/A

 
N/A

Columbia Bank
 
$
788,531

 
12.52
%
 
$
251,926

 
4.0
%
 
$
377,889

 
6.0
%
Total Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
890,029

 
14.13
%
 
$
503,989

 
8.0
%
 
N/A

 
N/A

Columbia Bank
 
$
860,755

 
13.67
%
 
$
503,852

 
8.0
%
 
$
629,816

 
10.0
%
Tier 1 Capital Leverage (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
817,805

 
10.57
%
 
$
309,579

 
4.0
%
 
N/A

 
N/A

Columbia Bank
 
$
788,531

 
9.79
%
 
$
322,029

 
4.0
%
 
$
402,537

 
5.0
%
v3.3.1.900
Branch Sales
 12 Months Ended
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Branch Sales
On August 23, 2014, Columbia completed a branch sale transaction to Sound Community Bank. In the transaction, Columbia sold three branches and related assets and deposit liabilities to Sound Community Bank. The transaction was completed with a transfer of $22.2 million in deposits to Sound Community Bancorp in exchange for a deposit premium of 2.35%. Also included in the branch sale were $1.1 million in loans and $3.8 million in premises and equipment. The Company recognized a gain of $565 thousand related to the deposit premium, which was recorded in the line item Other noninterest income in the consolidated statements of income. In addition, the Company recorded a $50 thousand loss on the disposal of premises and equipment related to this transaction, which was recorded in the line item Other noninterest expense in the consolidated statements of income.
v3.3.1.900
Parent Company Financial Information
 12 Months Ended
Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]  
Parent Company Financial Information
Parent Company Financial Information
Condensed Balance Sheets—Parent Company Only
 
 
December 31,
2015
 
2014
 
 
(in thousands)
Assets
 
 
 
 
Cash and due from banking subsidiary
 
$
3,429

 
$
10,322

Interest-earning deposits
 
560

 
12,274

Total cash and cash equivalents
 
3,989

 
22,596

Investment in banking subsidiary
 
1,228,070

 
1,207,143

Investment in other subsidiaries
 
5,567

 
5,351

Other assets
 
4,833

 
5,273

Total assets
 
$
1,242,459

 
$
1,240,363

Liabilities and Shareholders’ Equity
 
 
 
 
Other borrowings
 
$
—

 
$
8,248

Other liabilities
 
331

 
3,940

Total liabilities
 
331

 
12,188

Shareholders’ equity
 
1,242,128

 
1,228,175

Total liabilities and shareholders’ equity
 
$
1,242,459

 
$
1,240,363


Condensed Statements of Income—Parent Company Only
 
 
Years Ended December 31,
2015
 
2014
 
2013
(in thousands)
Income
 
 
 
 
 
 
Dividend from banking subsidiary
 
$
67,000

 
$
16,200

 
$
183,000

Interest-earning deposits
 
5

 
25

 
68

Other income
 
92

 
10

 
7

Total income
 
67,097

 
16,235

 
183,075

Expense
 
 
 
 
 
 
Compensation and employee benefits
 
618

 
530

 
658

Other borrowings
 
5

 
83

 
258

Other expense
 
1,368

 
1,433

 
4,162

Total expenses
 
1,991

 
2,046

 
5,078

Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries
 
65,106

 
14,189

 
177,997

Income tax benefit
 
(663
)
 
(704
)
 
(1,552
)
Income before equity in undistributed (excess distributed) earnings of subsidiaries
 
65,769

 
14,893

 
179,549

Equity in undistributed (excess distributed) earnings of subsidiaries
 
33,058

 
66,681

 
(119,533
)
Net income
 
$
98,827

 
$
81,574

 
$
60,016



Condensed Statements of Cash Flows—Parent Company Only
 
 
Years Ended December 31,
2015
 
2014
 
2013
(in thousands)
Operating Activities
 
 
 
 
 
 
Net income
 
$
98,827

 
$
81,574

 
$
60,016

Adjustments to reconcile net income to net cash provided by operating activities:
 
 
 
 
 
 
Equity in (undistributed) excess distributed earnings of subsidiaries
 
(33,058
)
 
(66,681
)
 
119,533

Stock-based compensation expense
 
4,090

 
2,859

 
2,844

Net changes in other assets and liabilities
 
(3,170
)
 
(403
)
 
6,830

Net cash provided by operating activities
 
66,689

 
17,349

 
189,223

Investing Activities
 
 
 
 
 
 
Net cash acquired (paid) in business combinations
 
—

 
10,277

 
(53,159
)
Net cash provided by (used in) investing activities
 
—

 
10,277

 
(53,159
)
Financing Activities
 
 
 
 
 
 
Preferred stock dividends
 
(137
)
 
(96
)
 
(32
)
Common stock dividends
 
(77,263
)
 
(49,494
)
 
(19,858
)
Repayment of other borrowings
 
(8,248
)
 
(14,636
)
 
(51,000
)
Exercise of warrants
 
—

 
5,000

 
—

Purchase and retirement of common stock
 
(906
)
 
(622
)
 
(429
)
Proceeds from exercise of stock options
 
1,258

 
929

 
1,092

Downstream stock offering proceeds to the Bank
 
—

 
—

 
(100,000
)
Excess tax benefit associated with share-based compensation
 
—

 
205

 
1,203

Net cash used in financing activities
 
(85,296
)
 
(58,714
)
 
(169,024
)
Decrease in cash and cash equivalents
 
(18,607
)
 
(31,088
)
 
(32,960
)
Cash and cash equivalents at beginning of year
 
22,596

 
53,684

 
86,644

Cash and cash equivalents at end of year
 
$
3,989

 
$
22,596

 
$
53,684
v3.3.1.900
Summary Of Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Financial Information (Unaudited)
Summary of Quarterly Financial Information (Unaudited)
Quarterly financial information for the years ended December 31, 2015 and 2014 is summarized as follows:
 
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Year Ended
December 31,
 
 
(in thousands, except per share amounts)
2015
 
 
 
 
 
 
 
 
 
 
Total interest income
 
$
81,417

 
$
82,040

 
$
82,665

 
$
82,769

 
$
328,891

Total interest expense
 
1,053

 
1,030

 
971

 
950

 
4,004

Net interest income
 
80,364

 
81,010

 
81,694

 
81,819

 
324,887

Provision for loan and lease losses
 
1,209

 
2,202

 
2,831

 
2,349

 
8,591

Noninterest income
 
22,767

 
21,462

 
22,499

 
24,745

 
91,473

Noninterest expense
 
66,734

 
68,471

 
64,067

 
66,877

 
266,149

Income before income taxes
 
35,188

 
31,799

 
37,295

 
37,338

 
141,620

Provision for income taxes
 
10,827

 
9,853

 
11,515

 
10,598

 
42,793

Net income
 
$
24,361

 
$
21,946

 
$
25,780

 
$
26,740

 
$
98,827

Per common share (1)
 
 
 
 
 
 
 
 
 
 
Earnings (basic)
 
$
0.42

 
$
0.38

 
$
0.45

 
$
0.46

 
$
1.71

Earnings (diluted)
 
$
0.42

 
$
0.38

 
$
0.45

 
$
0.46

 
$
1.71

2014
 
 
 
 
 
 
 
 
 
 
Total interest income
 
$
74,925

 
$
76,087

 
$
77,133

 
$
79,897

 
$
308,042

Total interest expense
 
985

 
963

 
913

 
1,133

 
3,994

Net interest income
 
73,940

 
75,124

 
76,220

 
78,764

 
304,048

Provision for loan and lease losses
 
1,922

 
2,117

 
980

 
1,708

 
6,727

Noninterest income
 
14,008

 
14,627

 
15,930

 
15,185

 
59,750

Noninterest expense
 
57,386

 
57,764

 
59,982

 
64,154

 
239,286

Income before income taxes
 
28,640

 
29,870

 
31,188

 
28,087

 
117,785

Provision for income taxes
 
8,796

 
8,643

 
9,605

 
9,167

 
36,211

Net income
 
$
19,844

 
$
21,227

 
$
21,583

 
$
18,920

 
$
81,574

Per common share (1)
 
 
 
 
 
 
 
 
 
 
Earnings (basic)
 
$
0.38

 
$
0.40

 
$
0.41

 
$
0.34

 
$
1.53

Earnings (diluted)
 
$
0.37

 
$
0.40

 
$
0.41

 
$
0.34

 
$
1.52

 __________
(1) Due to averaging of shares, quarterly earnings per share may not add up to the totals reported for the full year.
v3.3.1.900
Summary of Significant Accounting Policies (Policies)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Line Items]  
Cash and cash equivalents
Cash and cash equivalents
Cash and cash equivalents include cash and due from banks, and interest bearing balances due from correspondent banks and the Federal Reserve Bank. Cash equivalents have a maturity of 90 days or less at the time of purchase.
Securities
Securities
Securities are classified based on management’s intention on the date of purchase. All securities are classified as available for sale and are presented at fair value. Unrealized gains or losses on securities available for sale are excluded from net income but are included as separate components of other comprehensive income, net of taxes. Purchase premiums or discounts on securities available for sale are amortized or accreted into income using the interest method over the terms of the individual securities. The Company performs a quarterly assessment to determine whether a decline in fair value below amortized cost is other-than-temporary. Amortized cost includes adjustments made to the cost of an investment for accretion, amortization, collection of cash and previous other-than temporary impairment recognized in earnings. Other-than-temporary impairment exists when it is probable that the Company will be unable to recover the entire amortized cost basis of the security.
In performing the quarterly assessment for debt securities, management considers whether or not the Company expects to recover the entire amortized cost basis of the security. In addition, management also considers whether it is more likely than not that it will not have to sell the security before recovery of its cost basis. If the Company intends to sell a security or it is more likely than not it will be required to sell a security prior to recovery of its cost basis, the entire amount of impairment is recognized in earnings. If the Company does not intend to sell the security or it is not more likely than not it will be required to sell the security prior to recovery of its cost basis, the credit loss component of impairment is recognized in earnings and impairment associated with non-credit factors, such as market liquidity, is recognized in other comprehensive income net of tax. A credit loss is the difference between the cost basis of the security and the present value of cash flows expected to be collected, discounted at the security’s effective interest rate at the date of acquisition. The cost basis of an other-than-temporarily impaired security is written down by the amount of impairment recognized in earnings. The new cost basis is not adjusted for subsequent recoveries in fair value. However, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as interest income. The total other-than-temporary impairment, if any, is presented in the consolidated statements of income with a reduction for the amount of other-than-temporary impairment that is recognized in other comprehensive income, if any.
Realized gains or losses on sales of securities available for sale are recorded using the specific identification method.
Federal Home Loan Bank Stock
Federal Home Loan Bank Stock
Effective May 31, 2015, the Federal Home Loan Bank of Des Moines (the “FHLB Des Moines”) completed its merger with the Federal Home Loan Bank of Seattle (the “FHLB Seattle”). At closing, the FHLB Seattle merged with and into the FHLB Des Moines, with the FHLB Des Moines surviving the merger as the continuing bank. Also at closing, the Company, a member of the FHLB Seattle, automatically became a member of the FHLB Des Moines. Pursuant to the terms of the merger, each share of the Company’s FHLB Seattle Class B stock was converted into one share of FHLB Des Moines Class B stock.

FHLB Des Moines Class B stock is composed of two sub-classes: membership stock and activity based stock. Membership stock is stock we are required to purchase and hold as a condition of membership in the FHLB Des Moines. The Company’s membership stock purchase requirement is measured as a percentage of our year-end assets, subject to a $10 million cap. Activity based stock is stock we are required to purchase and hold in order to obtain an advance or participate in FHLB Des Moines mortgage programs. Class B stock may be redeemed, subject to certain limitations, on five years’ written notice to the FHLB Des Moines. FHLB Des Moines capital stock is carried at par value because the shares are issued, transferred, redeemed, and repurchased by the FHLB Des Moines at a par value of $100. FHLB Des Moines capital stock is subject to recoverability testing per the Financial Services-Depository and Lending topic of the FASB Accounting Standards Codification (“ASC”).
Loans
Loans, excluding purchased credit impaired loans are generally carried at the unpaid principal balance, net of premiums, discounts and net deferred loan fees. Net deferred loan fees include nonrefundable loan origination fees less direct loan origination costs. Net deferred loan fees, premiums and discounts are amortized into interest income using either the interest method or straight-line method over the terms of the loans, adjusted for actual prepayments. The amortization is calculated using the interest method for all loans except revolving loans, for which the straight-line method is used. Interest income is accrued as earned. Fees related to lending activities other than the origination or purchase of loans are recognized as noninterest income during the period the related services are performed.
Nonaccrual loans—Loans are placed on nonaccrual status when a loan becomes contractually past due 90 days with respect to interest or principal unless the loan is both well secured and in the process of collection, or if full collection of interest or principal becomes uncertain. When a loan is placed on nonaccrual status, any accrued and unpaid interest receivable is reversed and the amortization of net deferred loan fees, premiums and discounts ceases. Thereafter, interest collected on the loan is accounted for on the cash collection or cost recovery method until qualifying for return to accrual status. Generally, a loan may be returned to accrual status when the delinquent principal and interest are brought current in accordance with the terms of the loan agreement for a minimum period of six months and future payments are reasonably assured.
Impaired loans—Loans are considered impaired when based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or when a loan has been modified in a troubled debt restructuring. The assessment for impairment occurs when and while such loans are designated as classified per the Company’s internal risk rating system or when and while such loans are on nonaccrual. All nonaccrual loans greater than $500,000 and all troubled debt restructured loans are considered impaired and analyzed individually on a quarterly basis. Classified loans with an outstanding balance greater than $500,000 are evaluated for potential impairment on a quarterly basis.
When a loan with unique risk characteristics has been identified as being impaired, the amount of impairment will be measured by the Company using discounted cash flows, except when it is determined that the remaining source of repayment for the loan is the operation or liquidation of the underlying collateral. In these cases, the current fair value of the collateral, reduced by costs to sell, will be used in place of discounted cash flows. As a final alternative, the observable market price of the debt may be used to assess impairment. Predominantly, the Company uses the fair value of collateral approach based upon a reliable valuation.
When the measurement of the impaired loan is less than the recorded amount of the loan, an impairment is recognized by recording a charge-off to the allowance for loan and lease losses or by designating a specific reserve. The Company’s policy is to record cash receipts received on impaired loans first as reductions to principal and then to interest income.
Restructured Loans—A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that lead to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include interest rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses. Generally, a nonaccrual loan that is restructured remains on nonaccrual status for a period of six months to demonstrate that the borrower can meet the restructured terms. If the borrower’s performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan.
Purchased Credit Impaired Loans (“PCI Loans”)—Loans acquired with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are accounted for under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. In addition, because of the significant discounts associated with certain of the acquired loan portfolios, the Company elected to account for those certain acquired loans under ASC 310-30.
In situations where such loans have similar risk characteristics, loans are aggregated into pools to estimate cash flows. A pool is accounted for as a single asset with a single interest rate, cumulative loss rate and cash flow expectation. Expected cash flows at the acquisition date in excess of the fair value of loans are considered to be accretable yield, which is recognized as interest income over the life of the loan pool using a level yield method if the timing and amount of the future cash flows of the pool is reasonably estimable. Subsequent to the acquisition date, any increases in cash flow over those expected at purchase date in excess of fair value are recorded as interest income prospectively. Any subsequent decreases in cash flow over those expected at purchase date due to credit deterioration are recognized by recording an allowance for losses on purchased credit impaired loans. Any disposals of loans, including sales of loans, payments in full or foreclosures result in the removal of the loan from the loan pool at the carrying amount.
Unfunded loan commitments—Unfunded commitments are generally related to providing credit facilities to clients of the Bank and are not actively traded financial instruments. These unfunded commitments are disclosed as financial instruments with off-balance sheet risk in Note 17 in the Notes to Consolidated Financial Statements.
Allowance for Loan and Lease Losses
Allowance for Loan and Lease Losses
The Company accounts for the credit risk associated with lending activities through its allowance for loan and lease losses and provision for loan and lease losses. The provision is the expense recognized in the consolidated statements of income to adjust the allowance to the levels deemed appropriate by management, as determined through application of the Company’s allowance methodology procedures. The provision for loan and lease losses reflects management’s judgment of the adequacy of the allowance for loan and lease losses. Loan and lease losses are charged against the allowance when management believes the collectability of a loan balance is unlikely. Subsequent recoveries, if any, are credited to the allowance.
The allowance for loan and lease losses is evaluated on a regular basis by management and is based upon management’s periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, and estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.
The allowance consists of general, specific, and unallocated components. The general component covers loans not specifically measured for impairment and is based on historical loss experience adjusted for qualitative factors. The specific component relates to loans that are impaired. For impaired loans an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The unallocated allowance provides for other credit losses inherent in the Company’s loan portfolio that may not have been contemplated in the general and specific components of the allowance. This unallocated amount generally comprises less than 5% of the allowance. The unallocated amount is reviewed periodically based on trends in credit losses, the results of credit reviews and overall economic trends.
Allowance for Unfunded Commitments and Letters of Credit
Allowance for Unfunded Commitments and Letters of Credit
The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to these unfunded credit facilities. The determination of the adequacy of the allowance is based on periodic evaluations of the unfunded credit facilities including an assessment of the probability of commitment usage, credit risk factors for loans outstanding to these same customers, and the terms and expiration dates of the unfunded credit facilities. The allowance for unfunded commitments is included in other liabilities on the consolidated balance sheets, with changes to the balance charged against noninterest expense.
Premises and Equipment
Premises and Equipment
Land, buildings, leasehold improvements and equipment are stated at cost less accumulated depreciation and amortization. Gains or losses on dispositions are reflected in current operations. Expenditures for improvements and major renewals are capitalized, and ordinary maintenance, repairs and small purchases are charged to operating expenses. Depreciation and amortization are computed based on the straight-line method over the estimated useful lives of the various classes of assets. The ranges of useful lives for the principal classes of assets are as follows:
Buildings and building improvements
5 to 39 years
Leasehold improvements
Term of lease or useful life, whichever is shorter
Furniture, fixtures and equipment
3 to 7 years
Vehicles
5 years
Computer software
3 to 5 years
Software
Software
Capitalized software is stated at cost, less accumulated amortization. Amortization is computed on a straight-line basis and charged to expense over the estimated useful life of the software, which is generally three years. Capitalized software is included in Premises and equipment, net in the consolidated balance sheets.
Other Real Estate Owned—Noncovered
Other Real Estate Owned (“OREO”)
OREO is composed of real estate acquired in satisfaction of loans. Properties acquired by foreclosure or deed in lieu of foreclosure are transferred to OREO and are recorded at fair value less estimated costs to sell at the date of transfer of the property. The fair value of the OREO property is based upon current appraisal. If the carrying value exceeds the fair value at the time of the transfer, the difference is charged to the allowance for loan and lease losses. Losses that result from the ongoing periodic valuation of these properties are charged to the net cost of operation of OREO in the period in which they are identified. Improvements to the OREO are capitalized and holding costs are charged to the net cost of operation of OREO as incurred.
Covered Assets and Related FDIC Loss Sharing Asset
FDIC Loss-sharing Asset
The acquisition date fair value of the reimbursement the Company expected to receive from the FDIC under loss-sharing agreements was recorded in the FDIC loss-sharing asset on the consolidated balance sheet. Subsequent to initial recognition, the FDIC loss-sharing asset is reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments are measured on the same basis as the related covered assets. Any decrease in expected cash flows for the covered assets due to an increase in expected credit losses will increase the FDIC loss-sharing asset and any increase in expected future cash flows for the covered assets due to a decrease in expected credit losses will decrease the FDIC loss-sharing asset. Changes in the estimated cash flows on covered assets that are immediately recognized in income generally result in a similar immediate adjustment to the loss-sharing asset while changes in expected cash flows on covered assets that are accounted for as an adjustment to yield generally result in adjustments to the amortization or accretion rate for the loss-sharing asset. Increases and decreases to the FDIC loss-sharing asset are recorded as adjustments to noninterest income.
Goodwill and Intangibles
The acquisition date fair value of the reimbursement the Company expected to receive from the FDIC under loss-sharing agreements was recorded in the FDIC loss-sharing asset on the consolidated balance sheet. Subsequent to initial recognition, the FDIC loss-sharing asset is reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments are measured on the same basis as the related covered assets. Any decrease in expected cash flows for the covered assets due to an increase in expected credit losses will increase the FDIC loss-sharing asset and any increase in expected future cash flows for the covered assets due to a decrease in expected credit losses will decrease the FDIC loss-sharing asset. Changes in the estimated cash flows on covered assets that are immediately recognized in income generally result in a similar immediate adjustment to the loss-sharing asset while changes in expected cash flows on covered assets that are accounted for as an adjustment to yield generally result in adjustments to the amortization or accretion rate for the loss-sharing asset. Increases and decreases to the FDIC loss-sharing asset are recorded as adjustments to noninterest income.
Goodwill and Intangibles
Net assets of companies acquired in purchase transactions are recorded at fair value at the date of acquisition. Identified intangibles are amortized on an accelerated basis over the period benefited. Goodwill is not a
Income Taxes
Income Taxes
The provision for income taxes includes current and deferred income tax expense on net income adjusted for temporary and permanent differences such as interest income on state and municipal securities and investments in affordable housing credits. Deferred tax assets and liabilities are recognized for the expected future tax consequences of existing temporary differences between the financial reporting and tax reporting basis of assets and liabilities using enacted tax laws and rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. On a quarterly basis, management evaluates deferred tax assets to determine if these tax benefits are expected to be realized in future periods. This determination is based on facts and circumstances, including the Company’s current and future tax outlook. To the extent a deferred tax asset is no longer considered “more likely than not” to be realized, a valuation allowance is established.
We recognize the tax benefit from uncertain tax positions only if it is more likely than not that the tax positions will be sustained on examination by the tax authorities, based on the technical merits of the position. The tax benefit is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. We recognize interest and penalties related to unrecognized tax benefits in “Provision for income taxes” in the consolidated statements of income.
Earnings per Common Share
Earnings per Common Share
The Company’s capital structure includes convertible preferred shares, common shares, restricted common shares, common share options, and during portions of 2014 and 2013, warrants to purchase common shares. Restricted common shares participate in dividends declared on common shares at the same rate as common shares. Convertible preferred shares participate in dividends declared on common shares on an “as if converted” basis. Accordingly, the Company calculates earnings per common share (“EPS”) using the two-class method under the Earnings per Share topic of the FASB ASC. The two-class method is an earnings allocation formula that treats a participating security as having rights to earnings that otherwise would have been available to common shareholders but does not require the presentation of basic and diluted EPS for securities other than common shares.
Under the two-class method, basic EPS is computed by dividing earnings allocated to common shareholders by the weighted average number of common shares outstanding for the period. Earnings allocated to common shareholders represents net income reduced by earnings allocated to participating securities. Participating securities include nonvested restricted stock awards and preferred stock. Diluted EPS is computed in the same manner as basic earnings per share except that the denominator is increased to include the number of additional common shares that would have been outstanding if certain shares issuable upon exercise of options and warrants were included unless those additional shares would have been anti-dilutive. For the diluted EPS computation, the treasury stock method is applied and compared to the two-class method and whichever method results in a more dilutive impact is utilized to calculate diluted EPS.
Advertising
Advertising
Advertising costs are generally expensed as incurred.
Share-Based Payment
Share-Based Payment
The Company accounts for stock options and stock awards in accordance with the Compensation—Stock Compensation topic of the FASB ASC. Authoritative guidance requires the Company to measure the cost of employee services received in exchange for an award of equity instruments, such as stock options or stock awards, based on the fair value of the award on the grant date. This cost must be recognized in the consolidated statements of income over the vesting period of the award.
The Company issues restricted stock awards which generally vest over a four- or five-year period during which time the holder receives dividends and has full voting rights. Restricted stock is valued at the closing price of the Company’s stock on the date of an award.
Derivatives and Hedging Activities
Derivatives and Hedging Activities
In accordance with the Derivatives and Hedging topic of the FASB ASC, the Company recognizes derivatives as assets or liabilities on the consolidated balance sheets at their fair value. The Company periodically enters into interest rate contracts with customers and offsetting contracts with third parties. As these interest rate contracts are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the changes in fair value of these instruments are recognized immediately in earnings.
Purchased Credit Impaired Loans [Member]  
Accounting Policies [Line Items]  
Allowance for Loan and Lease Losses
Allowance for Loan Losses on Purchased Credit Impaired Loans
The Company updates its cash flow projections for purchased credit impaired loans accounted for under ASC 310-30 on a quarterly basis. Assumptions utilized in this process include projections related to probability of default, loss severity, prepayment and recovery lag. Projections related to probability of default and prepayment are calculated utilizing a loan migration analysis. The loan migration analysis is a matrix of probability that is used to estimate the probability of a loan pool transitioning into a particular delinquency state given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages, and recovery lags are based upon the collateral within the loan pools.
Any decreases in expected cash flows after the acquisition date and subsequent measurement periods are recognized by recording a provision for loan losses. See Purchased Credit Impaired Loans for further discussion.
v3.3.1.900
Business Combinations (Tables)
 12 Months Ended
Dec. 31, 2015
Intermountain Community Bancorp [Member]  
Business Acquisition [Line Items]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
 
 
November 1, 2014
 
 
(in thousands)
 
 
 
Purchase price as of November 1, 2014
 
$
131,935

Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
 
 
Cash and cash equivalents
 
$
47,283

Investment securities
 
299,458

Federal Home Loan Bank stock
 
2,124

Acquired loans
 
502,595

Interest receivable
 
4,656

Premises and equipment
 
20,696

Other real estate owned
 
2,752

Core deposit intangible
 
10,900

Other assets
 
35,128

Deposits
 
(736,795
)
Other borrowings
 
(22,904
)
Securities sold under agreements to repurchase
 
(59,043
)
Other liabilities
 
(13,725
)
Total fair value of identifiable net assets
 
93,125

Goodwill
 
$
38,810
Business Acquisition, Pro Forma Information [Table Text Block]
For illustrative purposes only, the following table presents certain unaudited pro forma information for the years ended December 31, 2014 and 2013. This unaudited estimated pro forma financial information was calculated as if Intermountain had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Intermountain with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.
 
 
Unaudited Pro Forma
 
 
Years Ended December 31,
 
 
2014
 
2013
 
 
(in thousands except per share)
Total revenues (net interest income plus noninterest income)
 
$
397,152

 
$
360,655

Net income
 
$
85,939

 
$
72,587

Earnings per share - basic
 
$
1.56

 
$
1.32

Earnings per share - diluted
 
$
1.55

 
$
1.31
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]
The following table shows the impact of the acquisition-related expenses related to the acquisition of Intermountain for the periods indicated to the various components of noninterest expense:
 
 
Year ended December 31,
 
 
2015
 
2014
 
 
(in thousands)
Noninterest Expense
 
 
 
 
Compensation and employee benefits
 
$
3,828

 
$
2,077

Occupancy
 
2,357

 
44

Advertising and promotion
 
448

 
464

Data processing
 
2,005

 
—

Legal and professional fees
 
1,247

 
2,114

Other
 
960

 
197

Total impact of acquisition-related costs to noninterest expense
 
$
10,845

 
$
4,896
West Coast Bancorp [Member]  
Business Acquisition [Line Items]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
 
 
April 1, 2013
 
 
(in thousands)
 
 
 
Purchase price as of April 1, 2013
 
$
540,791

Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
 
 
Cash and cash equivalents
 
$
110,440

Investment securities
 
730,842

Federal Home Loan Bank stock
 
11,824

Acquired loans
 
1,407,798

Premises and equipment
 
35,884

Other real estate owned
 
14,708

Core deposit intangible
 
15,257

Other assets
 
75,820

Deposits
 
(1,883,407
)
Federal Home Loan Bank advances
 
(128,885
)
Other borrowings
 
(51,000
)
Other liabilities
 
(26,888
)
Total fair value of identifiable net assets
 
312,393

Goodwill
 
$
228,398
Business Acquisition, Pro Forma Information [Table Text Block]
For illustrative purposes only, the following table presents certain unaudited pro forma information for the year ended December 31, 2013 as if West Coast had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of West Coast with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth, as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.
 
 
Unaudited Pro Forma
 
 
Year Ended December 31,
 
 
2013
 
 
(in thousands except per share)
Total revenues (net interest income plus noninterest income)
 
$
337,712

Net income
 
$
76,496

Earnings per share - basic
 
$
1.50

Earnings per share - diluted
 
$
1.46
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]
The following table shows the impact of the acquisition-related expenses related to the acquisition of West Coast for the periods indicated to the various components of noninterest expense:
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Noninterest Expense
 
 
 
 
 
 
Compensation and employee benefits
 
$
65

 
$
798

 
$
8,440

Occupancy
 
—

 
696

 
4,684

Advertising and promotion
 
—

 
—

 
877

Data processing
 
—

 
684

 
767

Legal and professional fees
 
7

 
383

 
4,766

Other
 
—

 
1,975

 
5,954

Total impact of acquisition-related costs to noninterest expense
 
$
72

 
$
4,536

 
$
25,488
v3.3.1.900
Securities (Tables)
 12 Months Ended
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]  
Securities Available for Sale
The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of securities available for sale:
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
December 31, 2015
 
(in thousands)
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
1,296,955

 
$
4,525

 
$
(14,991
)
 
$
1,286,489

State and municipal securities
 
480,417

 
12,690

 
(938
)
 
492,169

U.S. government agency and government-sponsored enterprise securities
 
354,515

 
1,113

 
(1,846
)
 
353,782

U.S. government securities
 
20,439

 
—

 
(302
)
 
20,137

Other securities
 
5,284

 
24

 
(191
)
 
5,117

Total
 
$
2,157,610

 
$
18,352

 
$
(18,268
)
 
$
2,157,694

December 31, 2014
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
1,160,378

 
$
10,219

 
$
(8,210
)
 
$
1,162,387

State and municipal securities
 
483,578

 
14,432

 
(1,526
)
 
496,484

U.S. government agency and government-sponsored enterprise securities
 
416,919

 
856

 
(4,069
)
 
413,706

U.S. government securities
 
20,910

 
—

 
(411
)
 
20,499

Other securities
 
5,284

 
20

 
(123
)
 
5,181

Total
 
$
2,087,069

 
$
25,527

 
$
(14,339
)
 
$
2,098,257
Schedule of gross realized gains and losses on sales and calls of securities available for sale [Table Text Block]
The following table provides the gross realized gains and losses on the sales and calls of securities for the periods indicated:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Gross realized gains
 
$
1,591

 
$
553

 
$
632

Gross realized losses
 
(10
)
 
(1
)
 
(170
)
Net realized gains
 
$
1,581

 
$
552

 
$
462
Schedule of Contractual Maturities of Investment Securities Available for Sale
The scheduled contractual maturities of investment securities available for sale at December 31, 2015 are presented as follows:
 
 
December 31, 2015
 
 
Amortized Cost
 
Fair Value
 
 
(in thousands)
Due within one year
 
$
22,191

 
$
22,418

Due after one year through five years
 
458,889

 
458,372

Due after five years through ten years
 
702,234

 
703,088

Due after ten years
 
969,012

 
968,699

Other securities with no stated maturity
 
5,284

 
5,117

Total investment securities available-for-sale
 
$
2,157,610

 
$
2,157,694
Schedule of Securities pledged as collateral [Table Text Block]
The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law: 
 
 
December 31, 2015
 
December 31, 2014
 
 
(in thousands)
Washington and Oregon State to secure public deposits
 
$
341,079

 
$
328,400

Federal Reserve Bank to secure borrowings
 
48,714

 
41,146

Other securities pledged
 
143,606

 
157,097

Total securities pledged as collateral
 
$
533,399

 
$
526,643
Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses
The following tables show the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2015 and 2014:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
December 31, 2015
 
(in thousands)
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
664,509

 
$
(7,610
)
 
$
214,325

 
$
(7,381
)
 
$
878,834

 
(14,991
)
State and municipal securities
 
48,261

 
(358
)
 
31,383

 
(580
)
 
79,644

 
(938
)
U.S. government agency and government-sponsored enterprise securities
 
193,400

 
(1,128
)
 
40,034

 
(718
)
 
233,434

 
(1,846
)
U.S. government securities
 
10,343

 
(136
)
 
9,794

 
(166
)
 
20,137

 
(302
)
Other securities
 
2,300

 
(15
)
 
2,780

 
(176
)
 
5,080

 
(191
)
Total
 
$
918,813

 
$
(9,247
)
 
$
298,316

 
$
(9,021
)
 
$
1,217,129

 
$
(18,268
)
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
258,825

 
$
(1,287
)
 
$
279,015

 
$
(6,924
)
 
$
537,840

 
$
(8,211
)
State and municipal securities
 
71,026

 
(543
)
 
44,148

 
(982
)
 
115,174

 
(1,525
)
U.S. government agency and government-sponsored enterprise securities
 
105,250

 
(518
)
 
216,221

 
(3,551
)
 
321,471

 
(4,069
)
U.S. government securities
 
—

 
—

 
19,450

 
(411
)
 
19,450

 
(411
)
Other securities
 
2,313

 
(2
)
 
2,834

 
(121
)
 
5,147

 
(123
)
Total
 
$
437,414

 
$
(2,350
)
 
$
561,668

 
$
(11,989
)
 
$
999,082

 
$
(14,339
)
v3.3.1.900
Loans (Tables)
 12 Months Ended
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]  
Analysis of Loan Portfolio by Major Types of Loans
The following is an analysis of the loan portfolio by major types of loans (net of unearned income):
 
 
December 31, 2015
 
December 31, 2014
 
 
Loans, excluding PCI loans
 
PCI Loans
 
Total
 
Loans, excluding PCI loans
 
PCI Loans
 
Total
 
 
(in thousands)
Commercial business
 
$
2,362,575

 
$
34,848

 
$
2,397,423

 
$
2,119,565

 
$
44,505

 
$
2,164,070

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
176,295

 
23,938

 
200,233

 
175,571

 
26,993

 
202,564

Commercial and multifamily residential
 
2,491,736

 
99,389

 
2,591,125

 
2,363,541

 
128,769

 
2,492,310

Total real estate
 
2,668,031

 
123,327

 
2,791,358

 
2,539,112

 
155,762

 
2,694,874

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
135,874

 
2,278

 
138,152

 
116,866

 
4,021

 
120,887

Commercial and multifamily residential
 
167,413

 
1,630

 
169,043

 
134,443

 
2,321

 
136,764

Total real estate construction
 
303,287

 
3,908

 
307,195

 
251,309

 
6,342

 
257,651

Consumer
 
342,601

 
18,823

 
361,424

 
364,182

 
23,975

 
388,157

Less: Net unearned income
 
(42,373
)
 
—

 
(42,373
)
 
(59,374
)
 
—

 
(59,374
)
Total loans, net of unearned income
 
5,634,121

 
180,906

 
5,815,027

 
5,214,794

 
230,584

 
5,445,378

Less: Allowance for loan and lease losses
 
(54,446
)
 
(13,726
)
 
(68,172
)
 
(53,233
)
 
(16,336
)
 
(69,569
)
Total loans, net
 
$
5,579,675

 
$
167,180

 
$
5,746,855

 
$
5,161,561

 
$
214,248

 
$
5,375,809

Loans held for sale
 
$
4,509

 
$
—

 
$
4,509

 
$
1,116

 
$
—

 
$
1,116
Analysis of Nonaccrual Loans
The following is an analysis of nonaccrual loans as of December 31, 2015 and 2014:
 
 
 
December 31, 2015
 
December 31, 2014
 
 
Recorded
Investment
Nonaccrual
Loans
 
Unpaid Principal
Balance
Nonaccrual
Loans
 
Recorded
Investment
Nonaccrual
Loans
 
Unpaid Principal
Balance
Nonaccrual
Loans
 
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
Secured
 
$
9,395

 
$
15,688

 
$
16,552

 
$
21,453

Unsecured
 
42

 
256

 
247

 
269

Real estate:
 
 
 
 
 
 
 
 
One-to-four family residential
 
820

 
1,866

 
2,822

 
5,680

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
Commercial land
 
349

 
332

 
821

 
1,113

Income property
 
2,843

 
3,124

 
3,200

 
5,521

Owner occupied
 
6,321

 
8,943

 
3,826

 
5,837

Real estate construction:
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
Land and acquisition
 
362

 
385

 
95

 
112

Residential construction
 
566

 
679

 
370

 
370

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
Owner occupied
 
—

 
—

 
480

 
489

Consumer
 
766

 
990

 
2,939

 
3,930

Total
 
$
21,464

 
$
32,263

 
$
31,352

 
$
44,774
Loans, Excluding Purchased Credit Impaired Loans [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Analysis of the Aged Loan Portfolio
The following is an aging of the recorded investment of the loan portfolio as of December 31, 2015 and 2014:
 
 
 
Current
Loans
 
30 - 59
Days
Past Due
 
60 - 89
Days
Past Due
 
Greater
than 90
Days Past
Due
 
Total
Past Due
 
Nonaccrual
Loans
 
Total Loans
December 31, 2015
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,241,069

 
$
11,611

 
$
617

 
$
—

 
$
12,228

 
$
9,395

 
$
2,262,692

Unsecured
 
94,867

 
39

 
—

 
—

 
39

 
42

 
94,948

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
170,913

 
1,637

 
66

 
—

 
1,703

 
820

 
173,436

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
212,740

 
69

 
—

 
—

 
69

 
349

 
213,158

Income property
 
1,305,502

 
1,750

 
684

 
—

 
2,434

 
2,843

 
1,310,779

Owner occupied
 
939,396

 
599

 
—

 
—

 
599

 
6,321

 
946,316

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
14,388

 
—

 
—

 
—

 
—

 
362

 
14,750

Residential construction
 
119,809

 
—

 
—

 
—

 
—

 
566

 
120,375

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
83,634

 
—

 
—

 
—

 
—

 
—

 
83,634

Owner occupied
 
81,671

 
—

 
—

 
—

 
—

 
—

 
81,671

Consumer
 
328,219

 
2,597

 
780

 
—

 
3,377

 
766

 
332,362

Total
 
$
5,592,208

 
$
18,302

 
$
2,147

 
$
—

 
$
20,449

 
$
21,464

 
$
5,634,121

 
 
Current
Loans
 
30 - 59
Days
Past Due
 
60 - 89
Days
Past Due
 
Greater
than 90
Days Past
Due
 
Total
Past Due
 
Nonaccrual
Loans
 
Total Loans
December 31, 2014
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,004,418

 
$
5,137

 
$
6,149

 
$
1,372

 
$
12,658

 
$
16,552

 
$
2,033,628

Unsecured
 
79,661

 
185

 
—

 
—

 
185

 
247

 
80,093

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
167,197

 
1,700

 
45

 
—

 
1,745

 
2,822

 
171,764

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
187,470

 
1,454

 
34

 
—

 
1,488

 
821

 
189,779

Income property
 
1,294,982

 
3,031

 
786

 
—

 
3,817

 
3,200

 
1,301,999

Owner occupied
 
839,689

 
937

 
289

 
—

 
1,226

 
3,826

 
844,741

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
15,462

 
953

 
—

 
—

 
953

 
95

 
16,510

Residential construction
 
97,821

 
326

 
—

 
4

 
330

 
370

 
98,521

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
73,783

 
—

 
—

 
—

 
—

 
—

 
73,783

Owner occupied
 
57,470

 
—

 
994

 
—

 
994

 
480

 
58,944

Consumer
 
341,032

 
933

 
118

 
10

 
1,061

 
2,939

 
345,032

Total
 
$
5,158,985

 
$
14,656

 
$
8,415

 
$
1,386

 
$
24,457

 
$
31,352

 
$
5,214,794
Impaired Financing Receivables
The following is an analysis of the impaired loans (see Note 1) as of December 31, 2015 and 2014: 
 
 
Recorded Investment
of Loans
Collectively Measured
for Contingency
Provision
 
Recorded Investment
of Loans
Individually
Measured for
Specific
Impairment
 
Impaired Loans With
Recorded Allowance
 
Impaired Loans Without
Recorded Allowance
 
 
Recorded
Investment
 
Unpaid
Principal
Balance
 
Related
Allowance
 
Recorded
Investment
 
Unpaid
Principal
Balance
December 31, 2015
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,257,168

 
$
5,524

 
$
690

 
$
718

 
$
321

 
$
4,834

 
$
6,455

Unsecured
 
94,948

 
—

 
—

 
—

 
—

 
—

 
—

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
172,150

 
1,286

 
314

 
339

 
314

 
972

 
1,397

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
213,158

 
—

 
—

 
—

 
—

 
—

 
—

Income property
 
1,308,673

 
2,106

 
—

 
—

 
—

 
2,106

 
2,311

Owner occupied
 
940,261

 
6,055

 
—

 
—

 
—

 
6,055

 
8,528

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
14,283

 
467

 
—

 
—

 
—

 
467

 
490

Residential construction
 
119,813

 
562

 
335

 
335

 
3

 
227

 
227

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
83,634

 
—

 
—

 
—

 
—

 
—

 
—

Owner occupied
 
81,671

 
—

 
—

 
—

 
—

 
—

 
—

Consumer
 
332,282

 
80

 
15

 
15

 
15

 
65

 
139

Total
 
$
5,618,041

 
$
16,080

 
$
1,354

 
$
1,407

 
$
653

 
$
14,726

 
$
19,547

 
 
 
Recorded Investment
of Loans
Collectively Measured
for Contingency
Provision
 
Recorded Investment
of Loans
Individually
Measured for
Specific
Impairment
 
Impaired Loans With
Recorded Allowance
 
Impaired Loans Without
Recorded Allowance
 
 
Recorded
Investment
 
Unpaid
Principal
Balance
 
Related
Allowance
 
Recorded
Investment
 
Unpaid
Principal
Balance
December 31, 2014
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,023,104

 
$
10,524

 
$
99

 
$
99

 
$
25

 
$
10,425

 
$
12,410

Unsecured
 
80,091

 
2

 
2

 
2

 
2

 
—

 
—

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
169,619

 
2,145

 
424

 
465

 
120

 
1,721

 
2,370

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
189,779

 
—

 
—

 
—

 
—

 
—

 
—

Income property
 
1,295,650

 
6,349

 
—

 
—

 
—

 
6,349

 
10,720

Owner occupied
 
835,895

 
8,846

 
582

 
582

 
27

 
8,264

 
12,732

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
16,401

 
109

 
109

 
109

 
67

 
—

 
—

Residential construction
 
98,521

 
—

 
—

 
—

 
—

 
—

 
—

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
73,783

 
—

 
—

 
—

 
—

 
—

 
—

Owner occupied
 
58,944

 
—

 
—

 
—

 
—

 
—

 
—

Consumer
 
344,908

 
124

 
—

 
—

 
—

 
124

 
201

Total
 
$
5,186,695

 
$
28,099

 
$
1,216

 
$
1,257

 
$
241

 
$
26,883

 
$
38,433



The following table provides additional information on impaired loans for the years ended December 31, 2015, 2014 and 2013:
 
 
Year Ended December 31, 2015
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
 
Average Recorded
Investment
Impaired Loans 
 
Interest Recognized
on
Impaired Loans
 
Average Recorded
Investment
Impaired Loans 
 
Interest Recognized
on
Impaired Loans
 
Average Recorded
Investment
Impaired Loans 
 
Interest Recognized
on
Impaired Loans
 
 
(in thousands)
Commercial business
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
7,987

 
$
84

 
$
7,345

 
$
36

 
$
5,636

 
$
19

Unsecured
 
—

 
—

 
19

 
1

 
61

 
3

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
2,848

 
47

 
2,094

 
49

 
1,665

 
63

Commercial & multifamily residential
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
94

 
—

 
82

 
—

 
1,691

 
—

Income property
 
2,913

 
36

 
6,782

 
270

 
8,910

 
238

Owner occupied
 
7,052

 
26

 
9,472

 
956

 
10,779

 
971

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
641

 
5

 
694

 
6

 
2,624

 
6

Residential construction
 
648

 
—

 
—

 
—

 
420

 
—

Consumer
 
189

 
4

 
147

 
9

 
253

 
6

Total
 
$
22,372

 
$
202

 
$
26,635

 
$
1,327

 
$
32,039

 
$
1,306
Analysis of loans classified as Troubled Debt Restructurings (“TDR”)
The following is an analysis of loans classified as troubled debt restructurings (“TDR”) for the years ended December 31, 2015, 2014 and 2013:
 
 
Year Ended December 31, 2015
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
 
Number of TDR Modifications
 
Pre-Modification
Outstanding
Recorded
Investment
 
Post-Modification
Outstanding
Recorded
Investment
 
Number of TDR Modifications
 
Pre-Modification
Outstanding
Recorded
Investment
 
Post-Modification
Outstanding
Recorded
Investment
 
Number of TDR Modifications
 
Pre-Modification
Outstanding
Recorded
Investment
 
Post-Modification
Outstanding
Recorded
Investment
 
 
(dollars in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
5

 
$
3,724

 
$
3,706

 
4

 
$
759

 
$
759

 
2

 
$
190

 
$
190

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
1

 
30

 
30

 
2

 
494

 
494

 
1

 
113

 
113

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
—

 
—

 
—

 
—

 
—

 
—

 
1

 
137

 
137

Income property
 
—

 
—

 
—

 
1

 
143

 
126

 
4

 
1,186

 
1,186

Owner occupied
 
—

 
—

 
—

 
1

 
1,496

 
1,496

 
1

 
172

 
172

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
—

 
—

 
—

 
—

 
—

 
—

 
1

 
117

 
117

Consumer
 
1

 
54

 
54

 
—

 
—

 
—

 
2

 
53

 
53

Total
 
7

 
$
3,808

 
$
3,790

 
8

 
$
2,892

 
$
2,875

 
12

 
$
1,968

 
$
1,968
Purchased Credit Impaired Loans [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Analysis of Loan Portfolio by Major Types of Loans
The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of December 31, 2015 and 2014:
 
 
December 31, 2015
 
December 31, 2014
 
 
(in thousands)
Commercial business
 
$
38,784

 
$
50,334

Real estate:
 
 
 
 
One-to-four family residential
 
27,195

 
31,981

Commercial and multifamily residential
 
106,308

 
140,398

Total real estate
 
133,503

 
172,379

Real estate construction:
 
 
 
 
One-to-four family residential
 
2,326

 
4,353

Commercial and multifamily residential
 
1,834

 
2,588

Total real estate construction
 
4,160

 
6,941

Consumer
 
20,903

 
26,814

Subtotal of purchased credit impaired loans
 
197,350

 
256,468

Less:
 
 
 
 
Valuation discount resulting from acquisition accounting
 
16,444

 
25,884

Allowance for loan losses
 
13,726

 
16,336

PCI loans, net of valuation discounts and allowance for loan losses
 
$
167,180

 
$
214,248
Changes in Accretable Yield for Acquired Loans [Table Text Block]
The following table shows the changes in accretable yield for acquired loans for the years ended December 31, 2015, 2014, and 2013:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Balance at beginning of period
 
$
73,849

 
$
103,907

 
$
166,888

Accretion
 
(21,919
)
 
(36,066
)
 
(51,816
)
Disposals
 
(1,681
)
 
(3,386
)
 
(6,898
)
Reclassifications from (to) nonaccretable difference
 
8,732

 
9,394

 
(4,267
)
Balance at end of period
 
$
58,981

 
$
73,849

 
$
103,907
v3.3.1.900
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Tables)
 12 Months Ended
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]  
Changes in the Allowance for Loan and Lease Losses
The following tables show a detailed analysis of the ALLL for loans for the years ended December 31, 2015, 2014 and 2013: 
 
 
Beginning
Balance
 
Charge-offs
 
Recoveries
 
Provision (Recovery)
 
Ending
Balance
 
Specific
Reserve
 
General
Allocation
Year Ended December 31, 2015
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
25,923

 
$
(7,486
)
 
$
2,069

 
$
11,815

 
$
32,321

 
$
321

 
$
32,000

Unsecured
 
927

 
(780
)
 
267

 
885

 
1,299

 
—

 
1,299

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
2,281

 
(376
)
 
307

 
(1,296
)
 
916

 
314

 
602

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
799

 
—

 
291

 
88

 
1,178

 
—

 
1,178

Income property
 
9,159

 
(390
)
 
3,568

 
(5,721
)
 
6,616

 
—

 
6,616

Owner occupied
 
5,007

 
(115
)
 
116

 
542

 
5,550

 
—

 
5,550

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,197

 
—

 
103

 
(961
)
 
339

 
—

 
339

Residential construction
 
1,860

 
—

 
90

 
(1,217
)
 
733

 
3

 
730

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
622

 
—

 
8

 
(242
)
 
388

 
—

 
388

Owner occupied
 
434

 
—

 
—

 
572

 
1,006

 
—

 
1,006

Consumer
 
3,180

 
(2,066
)
 
931

 
1,486

 
3,531

 
15

 
3,516

Purchased credit impaired
 
16,336

 
(13,854
)
 
7,329

 
3,915

 
13,726

 
—

 
13,726

Unallocated
 
1,844

 
—

 
—

 
(1,275
)
 
569

 
—

 
569

Total
 
$
69,569

 
$
(25,067
)
 
$
15,079

 
$
8,591

 
$
68,172

 
$
653

 
$
67,519

 
 
Beginning
Balance
 
Charge-offs
 
Recoveries
 
Provision (Recovery)
 
Ending
Balance
 
Specific
Reserve
 
General
Allocation
Year Ended December 31, 2014
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
31,027

 
$
(4,159
)
 
$
2,637

 
$
(3,582
)
 
$
25,923

 
$
25

 
$
25,898

Unsecured
 
696

 
(130
)
 
370

 
(9
)
 
927

 
2

 
925

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
1,252

 
(230
)
 
159

 
1,100

 
2,281

 
120

 
2,161

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
489

 
(29
)
 
70

 
269

 
799

 
—

 
799

Income property
 
9,234

 
(1,934
)
 
819

 
1,040

 
9,159

 
—

 
9,159

Owner occupied
 
3,605

 
(1,030
)
 
51

 
2,381

 
5,007

 
27

 
4,980

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
610

 
—

 
740

 
(153
)
 
1,197

 
67

 
1,130

Residential construction
 
822

 
—

 
1,190

 
(152
)
 
1,860

 
—

 
1,860

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
285

 
—

 
—

 
337

 
622

 
—

 
622

Owner occupied
 
58

 
—

 
—

 
376

 
434

 
—

 
434

Consumer
 
2,547

 
(2,774
)
 
1,353

 
2,054

 
3,180

 
—

 
3,180

Purchased credit impaired
 
20,174

 
(14,436
)
 
7,721

 
2,877

 
16,336

 
—

 
16,336

Unallocated
 
1,655

 
—

 
—

 
189

 
1,844

 
—

 
1,844

Total
 
$
72,454

 
$
(24,722
)
 
$
15,110

 
$
6,727

 
$
69,569

 
$
241

 
$
69,328


 
 
Beginning
Balance
 
Charge-offs
 
Recoveries
 
Provision (Recovery)
 
Ending
Balance
 
Specific
Reserve
 
General
Allocation
Year ended December 31, 2013
 
(in thousands)
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
27,270

 
$
(4,148
)
 
$
1,512

 
$
6,393

 
$
31,027

 
$
343

 
$
30,684

Unsecured
 
753

 
(794
)
 
932

 
(195
)
 
696

 
35

 
661

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
694

 
(228
)
 
270

 
516

 
1,252

 
138

 
1,114

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
460

 
(20
)
 
169

 
(120
)
 
489

 
—

 
489

Income property
 
11,033

 
(1,405
)
 
489

 
(883
)
 
9,234

 
26

 
9,208

Owner occupied
 
6,362

 
(1,118
)
 
375

 
(2,014
)
 
3,605

 
1,073

 
2,532

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,171

 
(32
)
 
2,553

 
(3,082
)
 
610

 
71

 
539

Residential construction
 
635

 
(101
)
 
112

 
176

 
822

 
—

 
822

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
316

 
—

 
—

 
(31
)
 
285

 
—

 
285

Owner occupied
 
102

 
—

 
—

 
(44
)
 
58

 
—

 
58

Consumer
 
2,437

 
(2,242
)
 
552

 
1,800

 
2,547

 
4

 
2,543

Purchased credit impaired
 
30,056

 
(13,853
)
 
7,232

 
(3,261
)
 
20,174

 
—

 
20,174

Unallocated
 
1,011

 
—

 
—

 
644

 
1,655

 
—

 
1,655

Total
 
$
82,300

 
$
(23,941
)
 
$
14,196

 
$
(101
)
 
$
72,454

 
$
1,690

 
$
70,764
Changes in the Allowance for Unfunded Commitments and Letters of Credit
Changes in the allowance for unfunded commitments and letters of credit, a component of other liabilities in the consolidated balance sheet, are summarized as follows:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Beginning balance
 
$
2,655

 
$
2,505

 
$
1,915

Net changes in the allowance for unfunded commitments and letters of credit
 
275

 
150

 
590

Ending balance
 
$
2,930

 
$
2,655

 
$
2,505
Financing Receivable Credit Quality Indicators [Table Text Block]
The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans as of December 31, 2015 and 2014:
 
 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2015
 
(in thousands)
Loans, excluding PCI loans
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
2,146,729

 
$
59,746

 
$
56,217

 
$
—

 
$
—

 
$
2,262,692

Unsecured
 
93,347

 
278

 
1,323

 
—

 
—

 
94,948

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
171,945

 
52

 
1,439

 
—

 
—

 
173,436

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
207,768

 
4,966

 
424

 
—

 
—

 
213,158

Income property
 
1,296,043

 
5,889

 
8,847

 
—

 
—

 
1,310,779

Owner occupied
 
918,986

 
9,668

 
17,662

 
—

 
—

 
946,316

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
14,388

 
—

 
362

 
—

 
—

 
14,750

Residential construction
 
119,243

 
—

 
1,132

 
—

 
—

 
120,375

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
83,634

 
—

 
—

 
—

 
—

 
83,634

Owner occupied
 
81,270

 
—

 
401

 
—

 
—

 
81,671

Consumer
 
328,286

 
—

 
4,076

 
—

 
—

 
332,362

Total
 
$
5,461,639

 
$
80,599

 
$
91,883

 
$
—

 
$
—

 
5,634,121

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for loan losses
 
54,446

Loans, excluding PCI loans, net
 
$
5,579,675

 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2014
 
(in thousands)
Loans, excluding PCI loans
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
1,963,210

 
$
15,790

 
$
54,628

 
$
—

 
$
—

 
$
2,033,628

Unsecured
 
79,534

 
—

 
559

 
—

 
—

 
80,093

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
163,914

 
55

 
7,795

 
—

 
—

 
171,764

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
183,701

 
4,217

 
1,861

 
—

 
—

 
189,779

Income property
 
1,287,729

 
5,885

 
8,385

 
—

 
—

 
1,301,999

Owner occupied
 
825,694

 
7,876

 
11,171

 
—

 
—

 
844,741

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
15,307

 
167

 
1,036

 
—

 
—

 
16,510

Residential construction
 
96,031

 
909

 
1,581

 
—

 
—

 
98,521

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
73,783

 
—

 
—

 
—

 
—

 
73,783

Owner occupied
 
58,055

 
—

 
889

 
—

 
—

 
58,944

Consumer
 
339,695

 
68

 
5,269

 
—

 
—

 
345,032

Total
 
$
5,086,653

 
$
34,967

 
$
93,174

 
$
—

 
$
—

 
5,214,794

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for loan losses
 
53,233

Loans, excluding PCI loans, net
 
$
5,161,561


The following is an analysis of the credit quality of our PCI loan portfolio as of December 31, 2015 and 2014:
 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2015
 
(in thousands)
PCI loans:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
31,468

 
$
101

 
$
5,995

 
$
—

 
$
—

 
$
37,564

Unsecured
 
1,218

 
—

 
2

 
—

 
—

 
1,220

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
25,018

 
—

 
2,177

 
—

 
—

 
27,195

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
8,234

 
—

 
664

 
—

 
—

 
8,898

Income property
 
36,426

 
—

 
5,916

 
—

 
—

 
42,342

Owner occupied
 
53,071

 
261

 
1,736

 
—

 
—

 
55,068

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,086

 
—

 
479

 
—

 
—

 
1,565

Residential construction
 
427

 
—

 
334

 
—

 
—

 
761

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
1,303

 
—

 
—

 
—

 
—

 
1,303

Owner occupied
 
531

 
—

 
—

 
—

 
—

 
531

Consumer
 
20,122

 
—

 
781

 
—

 
—

 
20,903

Total
 
$
178,904

 
$
362

 
$
18,084

 
$
—

 
$
—

 
197,350

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Valuation discount resulting from acquisition accounting
 
16,444

Allowance for loan losses
 
13,726

PCI loans, net
 
$
167,180

 
 
Pass
 
Special Mention
 
Substandard
 
Doubtful
 
Loss
 
Total
December 31, 2014
 
(in thousands)
PCI loans:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial business:
 
 
 
 
 
 
 
 
 
 
 
 
Secured
 
$
37,927

 
$
937

 
$
9,223

 
$
—

 
$
—

 
$
48,087

Unsecured
 
2,156

 
—

 
91

 
—

 
—

 
2,247

Real estate:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential
 
28,822

 
—

 
3,159

 
—

 
—

 
31,981

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial land
 
9,104

 
—

 
6,240

 
—

 
—

 
15,344

Income property
 
51,435

 
1,892

 
7,186

 
—

 
—

 
60,513

Owner occupied
 
58,629

 
346

 
5,566

 
—

 
—

 
64,541

Real estate construction:
 
 
 
 
 
 
 
 
 
 
 
 
One-to-four family residential:
 
 
 
 
 
 
 
 
 
 
 
 
Land and acquisition
 
1,595

 
—

 
913

 
—

 
—

 
2,508

Residential construction
 
741

 
—

 
1,104

 
—

 
—

 
1,845

Commercial and multifamily residential:
 
 
 
 
 
 
 
 
 
 
 
 
Income property
 
1,435

 
—

 
227

 
—

 
—

 
1,662

Owner occupied
 
926

 
—

 
—

 
—

 
—

 
926

Consumer
 
24,037

 
—

 
2,777

 
—

 
—

 
26,814

Total
 
$
216,807

 
$
3,175

 
$
36,486

 
$
—

 
$
—

 
256,468

Less:
 
 
 
 
 
 
 
 
 
 
 
 
Valuation discount resulting from acquisition accounting
 
25,884

Allowance for loan losses
 
16,336

PCI loans, net
 
$
214,248
v3.3.1.900
Other Real Estate Owned (Tables)
 12 Months Ended
Dec. 31, 2015
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]  
Summary of Other Real Estate Owned
The following table sets forth activity in OREO for the period:
 
 
December 31, 2015
 
December 31, 2014
 
 
(in thousands)
Balance, beginning of period
 
$
22,190

 
$
35,927

Established through acquisitions
 
—

 
2,752

Transfers in
 
8,688

 
10,200

Valuation adjustments
 
(1,986
)
 
(4,039
)
Proceeds from sale of OREO property
 
(19,292
)
 
(28,559
)
Gain on sale of OREO, net
 
4,138

 
5,909

Balance, end of period
 
$
13,738

 
$
22,190
v3.3.1.900
FDIC Loss-sharing Asset and Covered Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Covered Assets And FDIC Loss Sharing Asset [Line Items]  
FDIC Loss-sharing Asset
The following table shows a detailed analysis of the FDIC loss-sharing asset for the years ending December 31, 2015 and 2014:
 
 
2015
 
2014
 
 
(in thousands)
Balance at beginning of period
 
$
15,174

 
$
39,846

Adjustments not reflected in income:
 
 
 
 
Cash received from the FDIC, net
 
(2,794
)
 
(2,499
)
FDIC reimbursable recoveries, net
 
(1,802
)
 
(2,184
)
Adjustments reflected in income:
 
 
 
 
Amortization, net
 
(6,184
)
 
(21,279
)
Loan impairment
 
2,268

 
2,301

Sale of other real estate
 
(1,237
)
 
(2,179
)
Write-downs of other real estate
 
1,158

 
1,065

Other
 
(15
)
 
103

Balance at end of period
 
$
6,568

 
$
15,174
Schedule of FDIC Loss-Sharing Agreements and Covered Assets [Table Text Block]
The following table presents information about the composition of the FDIC loss-sharing asset, the clawback liability, and the non-single family and the single family covered assets as of the date indicated:
 
 
December 31, 2015
 
 
Columbia River Bank
 
American Marine Bank
 
Summit Bank
 
First Heritage Bank
 
Total
 
 
(in thousands)
FDIC loss-sharing asset
 
$
130

 
$
2,598

 
$
1,886

 
$
1,954

 
$
6,568

Clawback liability
 
$
3,248

 
$
1,227

 
$
—

 
$
679

 
$
5,154

Non-single family covered assets
 
$
73,707

 
$
12,111

 
$
9,405

 
$
15,596

 
$
110,819

Single family covered assets
 
$
8,114

 
$
22,962

 
$
6,180

 
$
1,766

 
$
39,022

 
 
 
 
 
 
 
 
 
 
 
Loss-sharing expiration dates:
 
 
 
 
 
 
 
 
 
 
Non-single family
 
First Quarter 2015
 
First Quarter 2015
 
Second Quarter 2016
 
Second Quarter 2016
 
 
Single family
 
First Quarter 2020
 
First Quarter 2020
 
Second Quarter 2021
 
Second Quarter 2021
 
 
Loss recovery expiration dates:
 
 
 
 
 
 
 
 
 
 
Non-single family
 
First Quarter 2018
 
First Quarter 2018
 
Second Quarter 2019
 
Second Quarter 2019
 
 
Single family
 
First Quarter 2020
 
First Quarter 2020
 
Second Quarter 2021
 
Second Quarter 2021
 
 
v3.3.1.900
Premises and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
accumulated depreciation and amortization, were as follows:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Land
 
$
51,446

 
$
52,338

Buildings
 
102,808

 
103,240

Leasehold improvements
 
20,604

 
21,199

Furniture and equipment
 
28,662

 
28,486

Vehicles
 
587

 
596

Computer software
 
17,294

 
15,666

Total cost
 
221,401

 
221,525

Less accumulated depreciation and amortization
 
(57,162
)
 
(49,435
)
Total
 
$
164,239

 
$
172,090
v3.3.1.900
Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The following table sets forth activity for goodwill and other intangible assets for the period:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Goodwill, beginning of period
 
$
382,537

 
$
343,952

 
$
115,554

Established through acquisitions and provisional period adjustments (1)
 
225

 
38,585

 
228,398

Total goodwill, end of period
 
382,762

 
382,537

 
343,952

Other intangible assets, net
 
 
 
 
 
 
Core deposit intangible:
 
 
 
 
 
 
Gross core deposit intangible balance, beginning of period
 
58,598

 
47,698

 
32,441

Accumulated amortization, beginning of period
 
(29,058
)
 
(22,765
)
 
(16,720
)
Core deposit intangible, net, beginning of period
 
29,540

 
24,933

 
15,721

Established through acquisitions
 
—

 
10,900

 
15,257

CDI current period amortization
 
(6,882
)
 
(6,293
)
 
(6,045
)
Total core deposit intangible, end of period
 
22,658

 
29,540

 
24,933

Intangible assets not subject to amortization
 
919

 
919

 
919

Other intangible assets, net at end of period
 
23,577

 
30,459

 
25,852

Total goodwill and intangible assets, end of period
 
$
406,339

 
$
412,996

 
$
369,804
Estimated Future Amortization Expense of Core Deposit Intangibles
The following table provides the estimated future amortization expense of core deposit intangibles for the succeeding five years:
 
Years Ending December 31,
 
(in thousands)
2016
 
$
5,945

2017
 
4,913

2018
 
3,855

2019
 
2,951

2020
 
2,048
v3.3.1.900
Deposits (Tables)
 12 Months Ended
Dec. 31, 2015
Deposits [Abstract]  
Schedule Of Deposits
Year-end deposits are summarized in the following table:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Core deposits:
 
 
 
 
Demand and other noninterest-bearing
 
$
3,507,358

 
$
2,651,373

Interest-bearing demand
 
925,909

 
1,304,258

Money market
 
1,788,552

 
1,760,331

Savings
 
657,016

 
615,721

Certificates of deposit less than $100,000
 
249,031

 
288,261

Total core deposits
 
7,127,866

 
6,619,944

Certificates of deposit greater than $100,000
 
182,973

 
202,014

Certificates of deposit insured through CDARS®
 
26,901

 
18,429

Brokered money market accounts
 
100,854

 
83,402

Subtotal
 
7,438,594

 
6,923,789

Valuation adjustment resulting from acquisition accounting
 
235

 
933

Total deposits
 
$
7,438,829

 
$
6,924,722
Schedule Of Time Deposits Maturity
The following table shows the amount and maturity of time deposits that had balances of $100,000 or greater:
 
Years Ending December 31,
 
(in thousands)
2016
 
$
168,149

2017
 
25,703

2018
 
4,837

2019
 
4,161

2020
 
6,803

Thereafter
 
221

Total
 
$
209,874
v3.3.1.900
Federal Home Loan Bank and Federal Reserve Bank Borrowings (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Instrument [Line Items]  
Schedule of Financial Instruments Owned and Pledged as Collateral
The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:
 
 
Remaining contractual maturity of the agreements
 
 
Overnight and continuous
 
Up to 30 days
 
30 - 90 days
 
Greater than 90 days
 
Total
December 31, 2015
 
(in thousands)
Class of collateral pledged for repurchase agreements
 
 
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations
 
$
74,699

 
$
—

 
$
—

 
$
25,000

 
$
99,699

Gross amount of recognized liabilities for repurchase agreements
 
99,699

Amounts related to agreements not included in offsetting disclosure
 
$
—
Federal Home Loan Bank Advances [Member]  
Debt Instrument [Line Items]  
Schedule of Maturities of Long-term Debt
At December 31, 2015 FHLB advances were scheduled to mature as follows:
 
 
Federal Home Loan Bank Advances
Fixed rate advances
 
 
Weighted Average Rate
 
Amount
 
 
(dollars in thousands)
Within 1 year
 
0.34
%
 
$
62,000

Over 1 through 5 years
 
5.66
%
 
1,000

Due after 10 years
 
5.37
%
 
5,000

Total
 
68,000

Valuation adjustment from acquisition accounting
 
531

Total
 
$
68,531
Debt Instrument Activity For Year
The maximum, average outstanding and year-end balances and average interest rates on advances from the FHLB were as follows for the years ended December 31, 2015, 2014 and 2013:
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
 
 
(dollars in thousands)
Balance at end of year
 
$
68,531

 
$
216,568

 
$
36,606

Average balance during the year
 
$
70,678

 
$
44,876

 
$
51,030

Maximum month-end balance during the year
 
$
242,556

 
$
216,568

 
$
190,631

Weighted average rate during the year
 
0.68
%
 
0.74
%
 
1.12
%
Weighted average rate at December 31
 
0.79
%
 
0.41
%
 
1.09
%
Schedule of Financial Instruments Owned and Pledged as Collateral
FHLB advances are collateralized by the following:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Recorded value of blanket pledge on loans receivable
 
$
1,399,201

 
$
1,083,879

Total
 
$
1,399,201

 
$
1,083,879

FHLB borrowing capacity
 
$
1,328,971

 
$
865,138
Federal Reserve Bank Advances [Member]  
Debt Instrument [Line Items]  
Debt Instrument Activity For Year
the Company has not had FRB borrowings in the last three years
Schedule of Financial Instruments Owned and Pledged as Collateral
The following table shows amounts pledged to the Federal Reserve Bank:
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Fair value of investment securities
 
$
47,516

 
$
40,128

Recorded value of pledged commercial loans
 
37,912

 
46,002

Total
 
$
85,428

 
$
86,130

Federal Reserve Bank borrowing capacity
 
$
85,428

 
$
86,130
v3.3.1.900
Derivatives and Balance Sheet Offsetting (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative [Line Items]  
Balance Sheet Offsetting [Table Text Block]
The following tables show the gross interest rate swap agreements and repurchase agreements in the consolidated balance sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.
 
Gross Amounts of Recognized Assets/Liabilities
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets
 
Gross Amounts Not Offset in the Consolidated Balance Sheets
 
 
 
 
Collateral Posted
 
Net Amount
December 31, 2015
(in thousands)
Assets
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
12,438

 
$
—

 
$
12,438

 
$
—

 
$
12,438

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
12,478

 
$
—

 
$
12,478

 
$
(12,478
)
 
$
—

Repurchase agreements
$
99,699

 
$
—

 
$
99,699

 
$
(99,699
)
 
$
—

 
 
 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
11,800

 
$
—

 
$
11,800

 
$
—

 
$
11,800

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
11,851

 
$
—

 
$
11,851

 
$
(11,851
)
 
$
—

Repurchase agreements
$
105,080

 
$
—

 
$
105,080

 
$
(105,080
)
 
$
—
Not Designated as Hedging Instrument [Member]  
Derivative [Line Items]  
Schedule of Fair Value Derivative Instruments
The following table presents the fair value and balance sheet classification of derivatives not designated as hedging instruments at December 31, 2015 and 2014:
 
Asset Derivatives
 
Liability Derivatives
 
2015
 
2014
 
2015
 
2014
(in thousands)
Balance Sheet
Location
 
Fair Value
 
Balance Sheet
Location
 
Fair Value
 
Balance Sheet
Location
 
Fair Value
 
Balance Sheet
Location
 
Fair Value
Interest rate contracts
Other assets
 
$
12,438

 
Other assets
 
$
11,800

 
Other liabilities
 
$
12,478

 
Other liabilities
 
$
11,851
v3.3.1.900
Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Employee Benefit [Line Items]  
Schedule of Accumulated and Projected Benefit Obligations
The following table reconciles the accumulated liability for the projected benefit obligation:  
 
 
December 31,
2015
 
2014
 
 
(in thousands)
Balance at beginning of year
 
$
16,541

 
$
16,423

Established through acquisitions
 
—

 
511

Change in actuarial loss
 
4,874

 
—

Plan amendments
 
2,617

 
—

Benefit expense
 
2,491

 
1,325

Benefit payments
 
(979
)
 
(1,718
)
Balance at end of year
 
$
25,544

 
$
16,541
SERP [Member]  
Employee Benefit [Line Items]  
Schedule of Expected Benefit Payments
The benefits expected to be paid in conjunction with the SERP are presented in the following table:
 
Years Ending December 31,
 
(in thousands)
2016
 
$
994

2017
 
1,128

2018
 
1,510

2019
 
1,548

2020
 
2,568

2021 through 2025
 
10,492

Total
 
$
18,240
v3.3.1.900
Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
As of December 31, 2015, minimum future rental payments, exclusive of taxes and other charges, of these leases were: 
Years Ending December 31,
 
(in thousands)
2016
 
$
6,774

2017
 
5,621

2018
 
4,983

2019
 
4,606

2020
 
3,810

Thereafter
 
13,968

Total minimum payments
 
$
39,762
v3.3.1.900
Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2015
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table shows changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2015, 2014 and 2013:
 
 
Unrealized Gains and Losses on Available-for-Sale Securities (1)
 
Unrealized Gains and Losses on Pension Plan Liability (1)
 
Total (1)
Year Ended December 31, 2015
 
(in thousands)
Beginning balance
 
$
7,462

 
$
(1,841
)
 
$
5,621

Other comprehensive loss before reclassifications
 
(6,069
)
 
(5,054
)
 
(11,123
)
Amounts reclassified from accumulated other comprehensive income (2)
 
(1,007
)
 
214

 
(793
)
Net current-period other comprehensive loss
 
(7,076
)
 
(4,840
)
 
(11,916
)
Ending balance
 
$
386

 
$
(6,681
)
 
$
(6,295
)
Year Ended December 31, 2014
 
 
 
 
 
 
Beginning balance
 
$
(10,108
)
 
$
(1,936
)
 
$
(12,044
)
Other comprehensive income before reclassifications
 
17,922

 
—

 
17,922

Amounts reclassified from accumulated other comprehensive income (2)
 
(352
)
 
95

 
(257
)
Net current-period other comprehensive income
 
17,570

 
95

 
17,665

Ending balance
 
$
7,462

 
$
(1,841
)
 
$
5,621

Year Ended December 31, 2013
 
 
 
 
 
 
Beginning balance
 
$
20,918

 
$
(769
)
 
$
20,149

Other comprehensive loss before reclassifications
 
(30,727
)
 
(1,432
)
 
(32,159
)
Amounts reclassified from accumulated other comprehensive income (2)
 
(299
)
 
265

 
(34
)
Net current-period other comprehensive loss
 
(31,026
)
 
(1,167
)
 
(32,193
)
Ending balance
 
$
(10,108
)
 
$
(1,936
)
 
$
(12,044
)
__________
(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
(2) See following table for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table shows details regarding the reclassifications from accumulated other comprehensive income for the years ended December 31, 2015, 2014 and 2013:
 
 
Amount Reclassified from Accumulated Other Comprehensive Income
 
Affected line Item in the Consolidated Statement of Income
 
 
Years Ended
 
 
 
 
December 31, 2015
 
December 31, 2014
 
December 31, 2013
 
 
 
 
(in thousands)
 
 
Unrealized gains and losses on available-for-sale securities
 
$
1,581

 
$
552

 
$
462

 
Investment securities gains, net
 
 
1,581

 
552

 
462

 
Total before tax
 
 
(574
)
 
(200
)
 
(163
)
 
Income tax provision
 
 
$
1,007

 
$
352

 
$
299

 
Net of tax
 
 
 
 
 
 
 
 
 
Amortization of pension plan liability
actuarial losses
 
$
(336
)
 
$
(149
)
 
$
(400
)
 
Compensation and employee benefits
 
 
(336
)
 
(149
)
 
(400
)
 
Total before tax
 
 
122

 
54

 
135

 
Income tax benefit
 
 
$
(214
)
 
$
(95
)
 
$
(265
)
 
Net of tax
v3.3.1.900
Fair Value Accounting and Measurement (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Financial Assets And Liabilities Accounted For Fair Value On Recurring Basis
The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at December 31, 2015 and 2014 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
 
 
Fair value  at
December 31, 2015
 
Fair Value Measurements at Reporting Date Using
 
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
Securities available for sale
 
 
 
 
 
 
 
 
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations
 
$
1,286,489

 
$
—

 
$
1,286,489

 
$
—

State and municipal securities
 
492,169

 
—

 
492,169

 
—

U.S. government agency and government-sponsored enterprise securities
 
353,782

 
—

 
353,782

 
—

U.S. government securities
 
20,137

 
20,137

 
—

 
—

Other securities
 
5,117

 
—

 
5,117

 
—

Total securities available for sale
 
$
2,157,694

 
$
20,137

 
$
2,137,557

 
$
—

Other assets (Interest rate contracts)
 
$
12,438

 
$
—

 
$
12,438

 
$
—

Liabilities
 
 
 
 
 
 
 
 
Other liabilities (Interest rate contracts)
 
$
12,478

 
$
—

 
$
12,478

 
$
—

 
 
Fair value  at
December 31, 2014
 
Fair Value Measurements at Reporting Date Using
 
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
Securities available for sale
 
 
 
 
 
 
 
 
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations
 
$
1,162,387

 
$
—

 
$
1,162,387

 
$
—

State and municipal debt securities
 
496,484

 
—

 
496,484

 
—

U.S. government agency and government-sponsored enterprise securities
 
413,706

 
—

 
413,706

 
—

U.S. government securities
 
20,499

 
20,499

 
—

 
—

Other securities
 
5,181

 
—

 
5,181

 
—

Total securities available for sale
 
$
2,098,257

 
$
20,499

 
$
2,077,758

 
$
—

Other assets (Interest rate contracts)
 
$
11,800

 
$
—

 
$
11,800

 
$
—

Liabilities
 
 
 
 
 
 
 
 
Other liabilities (Interest rate contracts)
 
$
11,851

 
$
—

 
$
11,851

 
$
—
Financial Assets Accounted For Fair Value On Nonrecurring Basis
The following table sets forth the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the years ended December 31, 2015 and 2014:
 
 
Fair value  at
December 31, 2015
 
Fair Value Measurements at Reporting Date Using
 
Losses During the Year Ended
December 31, 2015
 
 
Level 1
 
Level 2
 
Level 3
 
 
 
(in thousands)
Impaired loans
 
$
758

 
$
—

 
$
—

 
$
758

 
$
653

OREO
 
4,524

 
—

 
—

 
4,524

 
949

 
 
$
5,282

 
$
—

 
$
—

 
$
5,282

 
$
1,602

 
 
Fair value  at
December 31, 2014
 
Fair Value Measurements at Reporting Date Using
 
Losses During the Year Ended
December 31, 2014
 
 
Level 1
 
Level 2
 
Level 3
 
 
 
(in thousands)
OREO
 
$
5,365

 
$
—

 
$
—

 
$
5,365

 
$
1,008

 
 
$
5,365

 
$
—

 
$
—

 
$
5,365

 
$
1,008
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets during 2015 and 2014, along with the valuation techniques used, are shown in the following tables:
 
 
Fair value  at
December 31, 2015
 
Valuation Technique
 
Unobservable Input
 
Range (Weighted Average) (1)
 
 
(dollars in thousands)
Impaired loans - real estate collateral
 
$
380

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
Impaired loans - other collateral (3)
 
378

 
Fair Market Value of Collateral
 
Adjustment to Stated Value
 
N/A (2)
OREO
 
4,524

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of equipment and life insurance).
(2) Quantitative disclosures are not provided because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of equipment and life insurance.

 
 
Fair value  at
December 31, 2014
 
Valuation Technique
 
Unobservable Input
 
Range (Weighted Average) (1)
 
 
(dollars in thousands)
OREO
 
$
5,365

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal value during the current period.
Fair Value, by Balance Sheet Grouping
The following tables summarize carrying amounts and estimated fair values of selected financial instruments for the periods indicated:
 
 
 
December 31,
2015
 
 
Carrying
Amount
 
Fair
Value
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
 
$
166,929

 
$
166,929

 
$
166,929

 
$
—

 
$
—

Interest-earning deposits with banks
 
8,373

 
8,373

 
8,373

 
—

 
—

Securities available for sale
 
2,157,694

 
2,157,694

 
20,137

 
2,137,557

 
—

FHLB stock
 
12,722

 
12,722

 
—

 
12,722

 
—

Loans held for sale
 
4,509

 
4,509

 
—

 
4,509

 
—

Loans
 
5,746,855

 
5,752,423

 
—

 
—

 
5,752,423

FDIC loss-sharing asset
 
6,568

 
921

 
—

 
—

 
921

Interest rate contracts
 
12,438

 
12,438

 
—

 
12,438

 
—

Liabilities
 
 
 
 
 
 
 
 
 
 
Deposits
 
$
7,438,829

 
$
7,434,787

 
$
6,979,924

 
$
454,863

 
$
—

FHLB advances
 
68,531

 
69,176

 
—

 
69,176

 
—

Repurchase agreements
 
99,699

 
100,346

 
—

 
100,346

 
—

Interest rate contracts
 
12,478

 
12,478

 
—

 
12,478

 
—


 
 
December 31,
2014
 
 
Carrying
Amount
 
Fair
Value
 
Level 1
 
Level 2
 
Level 3
 
 
(in thousands)
Assets
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
 
$
171,221

 
$
171,221

 
$
171,221

 
$
—

 
$
—

Interest-earning deposits with banks
 
16,949

 
16,949

 
16,949

 
—

 
—

Securities available for sale
 
2,098,257

 
2,098,257

 
20,499

 
2,077,758

 
—

FHLB stock
 
33,365

 
33,365

 
—

 
33,365

 
—

Loans held for sale
 
1,116

 
1,116

 
—

 
1,116

 
—

Loans
 
5,375,809

 
5,516,286

 
—

 
—

 
5,516,286

FDIC loss-sharing asset
 
15,174

 
4,054

 
—

 
—

 
4,054

Interest rate contracts
 
11,800

 
11,800

 
—

 
11,800

 
—

Liabilities
 
 
 
 
 
 
 
 
 
 
Deposits
 
$
6,924,722

 
$
6,921,804

 
$
6,416,017

 
$
505,787

 
$
—

FHLB advances
 
216,568

 
217,296

 
—

 
217,296

 
—

Repurchase agreements
 
105,080

 
106,171

 
—

 
106,171

 
—

Other borrowings
 
8,248

 
8,248

 
—

 
8,248

 
—

Interest rate contracts
 
11,851

 
11,851

 
—

 
11,851

 
—
v3.3.1.900
Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share for the periods indicated:
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands except per share)
Basic EPS:
 
 
 
 
 
 
Net income
 
$
98,827

 
$
81,574

 
$
60,016

Less: Earnings allocated to participating securities
 
 
 
 
 
 
Preferred shares
 
175

 
157

 
95

Nonvested restricted shares
 
1,075

 
780

 
523

Earnings allocated to common shareholders
 
$
97,577

 
$
80,637

 
$
59,398

Weighted average common shares outstanding
 
57,019

 
52,618

 
47,993

Basic earnings per common share
 
$
1.71

 
$
1.53

 
$
1.24

Diluted EPS:
 
 
 
 
 
 
Earnings allocated to common shareholders (1)
 
$
97,577

 
$
80,640

 
$
59,407

Weighted average common shares outstanding
 
57,019

 
52,618

 
47,993

Dilutive effect of equity awards and warrants
 
13

 
565

 
1,058

Weighted average diluted common shares outstanding
 
57,032

 
53,183

 
49,051

Diluted earnings per common share
 
$
1.71

 
$
1.52

 
$
1.21

Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive
 
37

 
64

 
64


 __________
(1)
Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.
v3.3.1.900
Share-Based Payments (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Share Activity
A summary of changes in the Company’s nonvested shares and related information for the years ended December 31, 2015, 2014 and 2013 is presented below:
 
Nonvested Shares
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested at January 1, 2013
 
384,090

 
$
19.54

Granted
 
203,441

 
$
20.78

Vested
 
(117,153
)
 
$
16.90

Forfeited
 
(59,780
)
 
$
20.24

Nonvested at December 31, 2013
 
410,598

 
$
20.79

Granted
 
246,068

 
$
25.97

Vested
 
(108,371
)
 
$
21.45

Forfeited
 
(28,510
)
 
$
21.92

Nonvested at December 31, 2014
 
519,785

 
$
23.03

Granted
 
306,007

 
$
28.57

Vested
 
(131,775
)
 
$
21.55

Forfeited
 
(28,315
)
 
$
24.79

Nonvested at December 31, 2015
 
665,702

 
$
25.80
Schedule of Share-based Compensation, Stock Options, Activity
A summary of option activity under the Plan as of December 31, 2015, and changes during the year then ended is presented below.
Options
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
($000)
Balance at December 31, 2014
 
75,998

 
$
62.41

 
 
 
 
Forfeited
 
(6,387
)
 
$
79.60

 
 
 
 
Expired
 
(17,027
)
 
$
88.76

 
 
 
 
Exercised
 
(7,898
)
 
$
20.82

 
 
 
 
Balance at December 31, 2015
 
44,686

 
$
57.26

 
2.2
 
$
403

Vested or expected to vest at December 31, 2015
 
44,686

 
$
57.26

 
2.2
 
$
403

Total Exercisable at December 31, 2015
 
44,686

 
$
57.26

 
2.2
 
$
403
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
As of December 31, 2015, outstanding stock options consist of the following:
Ranges of
Exercise Prices
 
Number of
Option
Shares
 
Weighted Average
Remaining
Contractual Life
 
Weighted Average
Exercise Price of
Option Shares
 
Number of
Exercisable
Option Shares
 
Weighted Average
Exercise Price of
Exercisable Option
Shares
$0.00 - $9.99
 
17,635

 
3.3
 
$
9.91

 
17,635

 
$
9.91

$10.00 - $19.99
 
221

 
4.5
 
$
11.29

 
221

 
$
11.29

$40.00 - $49.99
 
349

 
2.5
 
$
44.49

 
349

 
$
44.49

$50.00 - $136.93
 
26,481

 
1.4
 
$
89.34

 
26,481

 
$
89.34

 
 
44,686

 
2.2
 
$
57.26

 
44,686

 
$
57.26
v3.3.1.900
Income Tax (Tables)
 12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The components of income tax expense are as follows:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Current tax expense
 
$
36,426

 
$
21,565

 
$
21,581

Deferred tax expense
 
6,367

 
14,646

 
5,413

Total
 
$
42,793

 
$
36,211

 
$
26,994
Schedule of Deferred Tax Assets and Liabilities
Significant components of the Company’s deferred tax assets and liabilities are as follows:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Deferred tax assets:
 
 
 
 
Allowance for loan and lease losses
 
$
26,024

 
$
26,341

Supplemental executive retirement plan
 
10,770

 
9,037

Stock option and restricted stock
 
1,423

 
1,177

OREO
 
813

 
1,101

Nonaccrual interest
 
69

 
68

Purchase accounting
 
9,457

 
15,272

Unrealized loss on investment securities
 
3,916

 
—

Net operating losses and credit carryforwards
 
11,467

 
14,929

Other
 
180

 
532

Total deferred tax assets
 
64,119

 
68,457

Deferred tax liabilities:
 
 
 
 
Asset purchase tax basis difference
 
(9,058
)
 
(6,595
)
FHLB stock dividends
 
(1,232
)
 
(4,086
)
Deferred loan fees
 
(5,202
)
 
(4,691
)
Unrealized gain on investment securities
 
—

 
(2,987
)
Depreciation
 
(3,730
)
 
(5,394
)
Total deferred tax liabilities
 
(19,222
)
 
(23,753
)
Net deferred tax asset
 
$
44,897

 
$
44,704
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the Company’s effective income tax rate with the federal statutory tax rate is as follows:
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
 
 
Amount
 
Percent
 
Amount
 
Percent
 
Amount
 
Percent
 
 
(dollars in thousands)
Income tax based on statutory rate
 
$
49,567

 
35
 %
 
$
41,225

 
35
 %
 
$
30,454

 
35
 %
Reduction resulting from:
 
 
 
 
 
 
 
 
 
 
 
 
Tax exempt instruments
 
(6,761
)
 
(5
)%
 
(5,328
)
 
(5
)%
 
(4,113
)
 
(5
)%
Life insurance proceeds
 
(1,554
)
 
(1
)%
 
(1,352
)
 
(1
)%
 
(1,250
)
 
(1
)%
Acquisition costs
 
—

 
—
 %
 
448

 
—
 %
 
1,362

 
2
 %
Other, net
 
1,541

 
1
 %
 
1,218

 
2
 %
 
541

 
—
 %
Income tax provision
 
$
42,793

 
30
 %
 
$
36,211

 
31
 %
 
$
26,994

 
31
 %
v3.3.1.900
Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2015
Regulatory Capital Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
As of December 31, 2015, the most recent notification from the Federal Deposit Insurance Corporation categorized Columbia Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, an institution must maintain minimum CET1 risk-based, Tier 1 risk-based, total risk-based and Tier 1 leverage ratios as set forth in the following table. There are no conditions or events since the notification that management believes have changed Columbia Bank’s category.
The Company and its banking subsidiary’s actual capital amounts and ratios as of December 31, 2015 and 2014 are presented in the following table:
 
 
Actual
 
For Capital
Adequacy
Purposes
 
To Be Well
Capitalized Under
Prompt
Corrective Action
Provision
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
 
(dollars in thousands)
As of December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
CET1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
852,731

 
11.94
%
 
$
321,370

 
4.5
%
 
N/A

 
N/A

Columbia Bank
 
$
839,127

 
11.76
%
 
$
321,168

 
4.5
%
 
$
463,909

 
6.5
%
Tier 1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
853,182

 
11.95
%
 
$
428,493

 
6.0
%
 
N/A

 
N/A

Columbia Bank
 
$
839,127

 
11.76
%
 
$
428,223

 
6.0
%
 
$
570,965

 
8.0
%
Total Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
924,284

 
12.94
%
 
$
571,324

 
8.0
%
 
N/A

 
N/A

Columbia Bank
 
$
910,229

 
12.75
%
 
$
570,965

 
8.0
%
 
$
713,706

 
10.0
%
Tier 1 Capital Leverage (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
853,182

 
10.03
%
 
$
340,420

 
4.0
%
 
N/A

 
N/A

Columbia Bank
 
$
839,127

 
9.89
%
 
$
339,405

 
4.0
%
 
$
424,256

 
5.0
%
As of December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
Tier 1 Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
817,805

 
12.98
%
 
$
251,995

 
4.0
%
 
N/A

 
N/A

Columbia Bank
 
$
788,531

 
12.52
%
 
$
251,926

 
4.0
%
 
$
377,889

 
6.0
%
Total Capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
890,029

 
14.13
%
 
$
503,989

 
8.0
%
 
N/A

 
N/A

Columbia Bank
 
$
860,755

 
13.67
%
 
$
503,852

 
8.0
%
 
$
629,816

 
10.0
%
Tier 1 Capital Leverage (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
The Company
 
$
817,805

 
10.57
%
 
$
309,579

 
4.0
%
 
N/A

 
N/A

Columbia Bank
 
$
788,531

 
9.79
%
 
$
322,029

 
4.0
%
 
$
402,537

 
5.0
%
v3.3.1.900
Parent Company Financial Information (Tables)
 12 Months Ended
Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]  
Condensed Balance Sheets - Parent Company Only
Condensed Balance Sheets—Parent Company Only
 
 
December 31,
2015
 
2014
 
 
(in thousands)
Assets
 
 
 
 
Cash and due from banking subsidiary
 
$
3,429

 
$
10,322

Interest-earning deposits
 
560

 
12,274

Total cash and cash equivalents
 
3,989

 
22,596

Investment in banking subsidiary
 
1,228,070

 
1,207,143

Investment in other subsidiaries
 
5,567

 
5,351

Other assets
 
4,833

 
5,273

Total assets
 
$
1,242,459

 
$
1,240,363

Liabilities and Shareholders’ Equity
 
 
 
 
Other borrowings
 
$
—

 
$
8,248

Other liabilities
 
331

 
3,940

Total liabilities
 
331

 
12,188

Shareholders’ equity
 
1,242,128

 
1,228,175

Total liabilities and shareholders’ equity
 
$
1,242,459

 
$
1,240,363
Condensed Statements of Income - Parent Company Only
Condensed Statements of Income—Parent Company Only
 
 
Years Ended December 31,
2015
 
2014
 
2013
(in thousands)
Income
 
 
 
 
 
 
Dividend from banking subsidiary
 
$
67,000

 
$
16,200

 
$
183,000

Interest-earning deposits
 
5

 
25

 
68

Other income
 
92

 
10

 
7

Total income
 
67,097

 
16,235

 
183,075

Expense
 
 
 
 
 
 
Compensation and employee benefits
 
618

 
530

 
658

Other borrowings
 
5

 
83

 
258

Other expense
 
1,368

 
1,433

 
4,162

Total expenses
 
1,991

 
2,046

 
5,078

Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries
 
65,106

 
14,189

 
177,997

Income tax benefit
 
(663
)
 
(704
)
 
(1,552
)
Income before equity in undistributed (excess distributed) earnings of subsidiaries
 
65,769

 
14,893

 
179,549

Equity in undistributed (excess distributed) earnings of subsidiaries
 
33,058

 
66,681

 
(119,533
)
Net income
 
$
98,827

 
$
81,574

 
$
60,016
Condensed Statements of Cash Flows - Parent Company Only
Condensed Statements of Cash Flows—Parent Company Only
 
 
Years Ended December 31,
2015
 
2014
 
2013
(in thousands)
Operating Activities
 
 
 
 
 
 
Net income
 
$
98,827

 
$
81,574

 
$
60,016

Adjustments to reconcile net income to net cash provided by operating activities:
 
 
 
 
 
 
Equity in (undistributed) excess distributed earnings of subsidiaries
 
(33,058
)
 
(66,681
)
 
119,533

Stock-based compensation expense
 
4,090

 
2,859

 
2,844

Net changes in other assets and liabilities
 
(3,170
)
 
(403
)
 
6,830

Net cash provided by operating activities
 
66,689

 
17,349

 
189,223

Investing Activities
 
 
 
 
 
 
Net cash acquired (paid) in business combinations
 
—

 
10,277

 
(53,159
)
Net cash provided by (used in) investing activities
 
—

 
10,277

 
(53,159
)
Financing Activities
 
 
 
 
 
 
Preferred stock dividends
 
(137
)
 
(96
)
 
(32
)
Common stock dividends
 
(77,263
)
 
(49,494
)
 
(19,858
)
Repayment of other borrowings
 
(8,248
)
 
(14,636
)
 
(51,000
)
Exercise of warrants
 
—

 
5,000

 
—

Purchase and retirement of common stock
 
(906
)
 
(622
)
 
(429
)
Proceeds from exercise of stock options
 
1,258

 
929

 
1,092

Downstream stock offering proceeds to the Bank
 
—

 
—

 
(100,000
)
Excess tax benefit associated with share-based compensation
 
—

 
205

 
1,203

Net cash used in financing activities
 
(85,296
)
 
(58,714
)
 
(169,024
)
Decrease in cash and cash equivalents
 
(18,607
)
 
(31,088
)
 
(32,960
)
Cash and cash equivalents at beginning of year
 
22,596

 
53,684

 
86,644

Cash and cash equivalents at end of year
 
$
3,989

 
$
22,596

 
$
53,684
v3.3.1.900
Summary Of Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Quarterly financial information for the years ended December 31, 2015 and 2014 is summarized as follows:
 
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Year Ended
December 31,
 
 
(in thousands, except per share amounts)
2015
 
 
 
 
 
 
 
 
 
 
Total interest income
 
$
81,417

 
$
82,040

 
$
82,665

 
$
82,769

 
$
328,891

Total interest expense
 
1,053

 
1,030

 
971

 
950

 
4,004

Net interest income
 
80,364

 
81,010

 
81,694

 
81,819

 
324,887

Provision for loan and lease losses
 
1,209

 
2,202

 
2,831

 
2,349

 
8,591

Noninterest income
 
22,767

 
21,462

 
22,499

 
24,745

 
91,473

Noninterest expense
 
66,734

 
68,471

 
64,067

 
66,877

 
266,149

Income before income taxes
 
35,188

 
31,799

 
37,295

 
37,338

 
141,620

Provision for income taxes
 
10,827

 
9,853

 
11,515

 
10,598

 
42,793

Net income
 
$
24,361

 
$
21,946

 
$
25,780

 
$
26,740

 
$
98,827

Per common share (1)
 
 
 
 
 
 
 
 
 
 
Earnings (basic)
 
$
0.42

 
$
0.38

 
$
0.45

 
$
0.46

 
$
1.71

Earnings (diluted)
 
$
0.42

 
$
0.38

 
$
0.45

 
$
0.46

 
$
1.71

2014
 
 
 
 
 
 
 
 
 
 
Total interest income
 
$
74,925

 
$
76,087

 
$
77,133

 
$
79,897

 
$
308,042

Total interest expense
 
985

 
963

 
913

 
1,133

 
3,994

Net interest income
 
73,940

 
75,124

 
76,220

 
78,764

 
304,048

Provision for loan and lease losses
 
1,922

 
2,117

 
980

 
1,708

 
6,727

Noninterest income
 
14,008

 
14,627

 
15,930

 
15,185

 
59,750

Noninterest expense
 
57,386

 
57,764

 
59,982

 
64,154

 
239,286

Income before income taxes
 
28,640

 
29,870

 
31,188

 
28,087

 
117,785

Provision for income taxes
 
8,796

 
8,643

 
9,605

 
9,167

 
36,211

Net income
 
$
19,844

 
$
21,227

 
$
21,583

 
$
18,920

 
$
81,574

Per common share (1)
 
 
 
 
 
 
 
 
 
 
Earnings (basic)
 
$
0.38

 
$
0.40

 
$
0.41

 
$
0.34

 
$
1.53

Earnings (diluted)
 
$
0.37

 
$
0.40

 
$
0.41

 
$
0.34

 
$
1.52

 __________
(1) Due to averaging of shares, quarterly earnings per share may not add up to the totals reported for the full year.
v3.3.1.900
Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
location
Accounting Policies [Line Items]  
Number Of Branch Locations 149
Number Of Days Used To Determine Treatment As Cash Equivalent 90 days
Number of Days of Delinqunecy at Which Loans Are Categorized As Non Accrual Status 90 days
Loans and Leases Receivable, Nonaccrual Loans Considered Impaired | $ $ 500,000
Loans and Leases Receivable, Loans Evaluated For Impairment On Quarterly Basis, Outstanding | $ $ 500,000
Core Deposits [Member]  
Accounting Policies [Line Items]  
Estimated life of CDI, in years 10 years
WASHINGTON  
Accounting Policies [Line Items]  
Number Of Branch Locations 74
OREGON  
Accounting Policies [Line Items]  
Number Of Branch Locations 59
IDAHO  
Accounting Policies [Line Items]  
Number Of Branch Locations 16
Vehicles [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P5Y
Minimum [Member] | Building and Building Improvements [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P5Y
Minimum [Member] | Furniture and Fixtures [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P3Y
Minimum [Member] | Software [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P3Y
Maximum [Member] | Building and Building Improvements [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P39Y
Maximum [Member] | Furniture and Fixtures [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P7Y
Maximum [Member] | Software [Member]  
Accounting Policies [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives P5Y
v3.3.1.900
Business Combinations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 01, 2014
Apr. 02, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Cost of Acquired Entity, Purchase Price, Total $ 131,935        
Business Combination, Acquisition Related Costs     $ 10,845 $ 4,896  
Business Acquisition, Effective Date of Acquisition Nov. 01, 2014        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 47,283        
Business Acquisition, Purchase Price Allocation, Current Assets, Marketable Securities 299,458        
Business Acquisition, Purchase Price Allocation, FHLB Stock 2,124        
Business Combination, Acquired Receivables, Fair Value 502,595        
Business Acquisition, Purchase Price Allocation, Accrued Interest Receivable 4,656        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 20,696        
Business Acquisition, Purchase Price Allocation, Other Real Estate Owned 2,752        
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets 10,900        
Business Combination, Purchase Price Allocation, Other Assets 35,128        
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits (736,795)        
Business Acquisition, Purchase Price Allocation, Junior Subordinated Debentures (22,904)        
Business combination, purchase price allocation, securities sold under agreements to repurchase (59,043)        
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities (13,725)        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 93,125        
Business Combination, Purchase Price Allocation, Goodwill Amount $ 38,810        
Business Acquisition, Pro Forma Revenue     397,152 360,655  
Business Acquisition, Pro Forma Net Income (Loss)     $ 85,939 $ 72,587  
Business Acquisition, Pro Forma Earnings Per Share, Basic     $ 1.56 $ 1.32  
Business Acquisition, Pro Forma Earnings Per Share, Diluted     $ 1.55 $ 1.31  
West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Cost of Acquired Entity, Purchase Price, Total   $ 540,791      
Business Combination, Acquisition Related Costs     $ 72 $ 4,536 $ 25,488
Business Acquisition, Effective Date of Acquisition   Apr. 01, 2013      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   $ 110,440      
Business Acquisition, Purchase Price Allocation, Current Assets, Marketable Securities   730,842      
Business Acquisition, Purchase Price Allocation, FHLB Stock   11,824      
Business Combination, Acquired Receivables, Fair Value   1,407,798      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   35,884      
Business Acquisition, Purchase Price Allocation, Other Real Estate Owned   14,708      
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets   15,257      
Business Combination, Purchase Price Allocation, Other Assets   75,820      
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits   (1,883,407)      
business combination, recognized identifiable assets acquired and liabilities assumed, Federal Home Loan Bank Advances   (128,885)      
Business Acquisition, Purchase Price Allocation, Junior Subordinated Debentures   (51,000)      
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities   (26,888)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   312,393      
Business Combination, Purchase Price Allocation, Goodwill Amount   $ 228,398      
Business Acquisition, Pro Forma Revenue       337,712  
Business Acquisition, Pro Forma Net Income (Loss)       $ 76,496  
Business Acquisition, Pro Forma Earnings Per Share, Basic       $ 1.50  
Business Acquisition, Pro Forma Earnings Per Share, Diluted       $ 1.46  
Compensation and employee benefits [Member] | Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     3,828 $ 2,077  
Compensation and employee benefits [Member] | West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     65 798 8,440
Occupancy [Member] | Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     2,357 44  
Occupancy [Member] | West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     0 696 4,684
Advertising and promotion [Member] | Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     448 464  
Advertising and promotion [Member] | West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     0 0 877
Data processing and communications [Member] | Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     2,005 0  
Data processing and communications [Member] | West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     0 684 767
Legal and professional fees [Member] | Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     1,247 2,114  
Legal and professional fees [Member] | West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     7 383 4,766
Other noninterest expenses [Member] | Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     960 197  
Other noninterest expenses [Member] | West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     $ 0 $ 1,975 $ 5,954
v3.3.1.900
Business Combinations narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 01, 2014
Apr. 02, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Intermountain Community Bancorp [Member]          
Business Acquisition [Line Items]          
Business combinations, provisional information, initial accounting incomplete, adjustment, goodwill $ 225        
Business Combination, Purchase Price Allocation, Goodwill Amount $ 38,810        
Business Acquisition, Effective Date of Acquisition Nov. 01, 2014        
Business Combination, Cost of Acquired Entity, Purchase Price, Total $ 131,935        
Business combinations, provisional information, initial accounting incomplete, adjustment, other assets 225        
Business Combination, Acquired Receivables, Fair Value 502,595        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 93,125        
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets $ 10,900        
business combinations, core deposit intangible percentage of core deposits 1.75%        
Business Combination, Acquisition Related Costs     $ 10,845 $ 4,896  
Business Combination, Purchase Price Allocation, Other Assets $ 35,128        
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits $ 736,795        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
West Coast Bancorp [Member]          
Business Acquisition [Line Items]          
Business Combination, Purchase Price Allocation, Goodwill Amount   $ 228,398      
Business Acquisition, Effective Date of Acquisition   Apr. 01, 2013      
Business Combination, Cost of Acquired Entity, Purchase Price, Total   $ 540,791      
Business Combination, Acquired Receivables, Fair Value   1,407,798      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   312,393      
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets   $ 15,257      
business combinations, core deposit intangible percentage of core deposits   0.89%      
Business Combination, Acquisition Related Costs     $ 72 $ 4,536 $ 25,488
Business Combination, Purchase Price Allocation, Other Assets   $ 75,820      
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits   $ 1,883,407      
Business Acquisition, Percentage of Voting Interests Acquired   100.00%      
v3.3.1.900
Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Federal Reserve Bank [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents $ 61.6 $ 47.4
v3.3.1.900
Securities (Securities Available for Sale) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 2,157,610 $ 2,087,069  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 18,352 25,527  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (18,268) (14,339)  
Securities available for sale 2,157,694 2,098,257  
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Available-for-sale Securities, Gross Realized Losses 10 1 $ 170
Available-for-sale Securities, Gross Realized Gains 1,591 553 $ 632
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,296,955 1,160,378  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,525 10,219  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (14,991) (8,210)  
Securities available for sale 1,286,489 1,162,387  
State and Municipal Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 480,417 483,578  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 12,690 14,432  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (938) (1,526)  
Securities available for sale 492,169 496,484  
U.S. Government Agency and Government-Sponsored Enterprise Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 354,515 416,919  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,113 856  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,846) (4,069)  
Securities available for sale 353,782 413,706  
US Treasury Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 20,439 20,910  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (302) (411)  
Securities available for sale 20,137 20,499  
Other Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 5,284 5,284  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 24 20  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (191) (123)  
Securities available for sale $ 5,117 $ 5,181  
v3.3.1.900
Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Available-for-sale Securities [Abstract]  
Due within one year, Amortized Cost $ 22,191
Due after one year through five years, Amortized Cost 458,889
Due after five years through ten years, Amortized Cost 702,234
Due after ten years, Amortized Cost 969,012
Total investment securities available-for-sale, Amortized Cost 2,157,610
Due within one year, Fair Value 22,418
Due after one year through five years, Fair Value 458,372
Due after five years through ten years, Fair Value 703,088
Due after ten years, Fair Value 968,699
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 5,284
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 5,117
Total investment securities available-for-sale, Fair Value $ 2,157,694
v3.3.1.900
Securities (Carrying Value of Securities Pledged as Collateral) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Carrying amount of securities pledged as collateral $ 533,399 $ 526,643
To Washington and Oregon State To Secure Public Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Carrying amount of securities pledged as collateral 341,079 328,400
To Federal Reserve Bank To Secure Borrowings [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Carrying amount of securities pledged as collateral 48,714 41,146
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Carrying amount of securities pledged as collateral $ 143,606 $ 157,097
v3.3.1.900
Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months Fair Value $ 918,813 $ 437,414
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss, Instant 9,247 2,350
12 Months or More Fair Value 298,316 561,668
12 Months or More Unrealized Losses (9,021) (11,989)
Total Fair Value 1,217,129 999,082
Total Unrealized Losses (18,268) (14,339)
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months Fair Value 664,509 258,825
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss, Instant 7,610 1,287
12 Months or More Fair Value 214,325 279,015
12 Months or More Unrealized Losses (7,381) (6,924)
Total Fair Value 878,834 537,840
Total Unrealized Losses (14,991) (8,211)
State and Municipal Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months Fair Value 48,261 71,026
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss, Instant 358 543
12 Months or More Fair Value 31,383 44,148
12 Months or More Unrealized Losses (580) (982)
Total Fair Value 79,644 115,174
Total Unrealized Losses (938) (1,525)
U.S. Government and Government-Sponsored Enterprise Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months Fair Value 193,400 105,250
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss, Instant 1,128 518
12 Months or More Fair Value 40,034 216,221
12 Months or More Unrealized Losses (718) (3,551)
Total Fair Value 233,434 321,471
Total Unrealized Losses (1,846) (4,069)
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months Fair Value 10,343 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss, Instant 136 0
12 Months or More Fair Value 9,794 19,450
12 Months or More Unrealized Losses (166) (411)
Total Fair Value 20,137 19,450
Total Unrealized Losses (302) (411)
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months Fair Value 2,300 2,313
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss, Instant 15 2
12 Months or More Fair Value 2,780 2,834
12 Months or More Unrealized Losses (176) (121)
Total Fair Value 5,080 5,147
Total Unrealized Losses $ (191) $ (123)
v3.3.1.900
Securities (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
issuance
security
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ $ 95.4 $ 63.3 $ 166.9
Number Of Issuances Of Securities Exceeding Shareholders Equity Threshold | issuance 0    
U.S. Government and Government-Sponsored Enterprise Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number Of Securities In Unrealized Loss Position 25    
Number Of Securities In Continuous Loss Position For Twelve Months or More 5    
US Treasury Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number Of Securities In Unrealized Loss Position 3    
Number Of Securities In Continuous Loss Position For Twelve Months or More 1    
Other Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Issuances Of Securities Exceeding Shareholders Equity Threshold, Percent 10.00%    
Number Of Securities In Unrealized Loss Position 2    
Number Of Securities In Continuous Loss Position For Twelve Months or More 1    
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number Of Securities In Unrealized Loss Position 143    
Number Of Securities In Continuous Loss Position For Twelve Months or More 49    
Municipal Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number Of Securities In Unrealized Loss Position 67    
Number Of Securities In Continuous Loss Position For Twelve Months or More 27    
v3.3.1.900
Securities Securities (Summary of Gross Realized Gains and Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]      
Available-for-sale Securities, Gross Realized Gains $ 1,591 $ 553 $ 632
Available-for-sale Securities, Gross Realized Losses (10) (1) (170)
Gain (Loss) on Sale of Securities, Net $ 1,581 $ 552 $ 462
v3.3.1.900
Loans (Narrative) (Details)
$ in Thousands, loan in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
contract
loan
Dec. 31, 2013
USD ($)
contract
Financing Receivable, Recorded Investment [Line Items]      
Loans to related parties $ 10,000 $ 13,200  
Loans and Leases Receivable, Related Parties, Additions 0    
Repayments on related party loans 3,200    
Financing Receivable, Recorded Investment, Nonaccrual Status 21,464    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 1,300 $ 2,200 $ 2,900
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing, Number of Loans 0    
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing, Number of Loans | loan   1.4  
Loans and Leases Receivable, Nonaccrual of Interest, Commitments of Additional Funds 2,900 $ 349  
Financing Receivable Modifications Additional Commitment To Lend $ 0 $ 0 $ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract 0 0 0
Loans Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans pledged to collateralize Federal Home Loan Bank Advances $ 2,220,000 $ 1,080,000  
Commercial Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans pledged to collateralize Federal Reserve Bank Borrowings $ 50,100 $ 46,000  
v3.3.1.900
Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income $ (42,373) $ (59,374)    
Total loans, net of unearned income 5,815,027 5,445,378    
Less: Allowance for loan and lease losses (68,172) (69,569) $ (72,454) $ (82,300)
Loans, net 5,746,855 5,375,809    
Loans held for sale 4,509 1,116    
Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 200,233 202,564    
Real Estate Construction 138,152 120,887    
Less: Allowance for loan and lease losses (916) (2,281) (1,252) (694)
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 2,591,125 2,492,310    
Real Estate Construction 169,043 136,764    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 2,397,423 2,164,070    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 2,791,358 2,694,874    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 307,195 257,651    
Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Consumer 361,424 388,157    
Less: Allowance for loan and lease losses (3,531) (3,180) $ (2,547) $ (2,437)
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income (42,373) (59,374)    
Total loans, net of unearned income 5,634,121 5,214,794    
Less: Allowance for loan and lease losses (54,446) (53,233)    
Loans, net 5,579,675 5,161,561    
Loans held for sale 4,509 1,116    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 176,295 175,571    
Real Estate Construction 135,874 116,866    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 2,491,736 2,363,541    
Real Estate Construction 167,413 134,443    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 2,362,575 2,119,565    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 2,668,031 2,539,112    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 303,287 251,309    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Consumer 342,601 364,182    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income 0 0    
Total loans, net of unearned income 180,906 230,584    
Less: Allowance for loan and lease losses (13,726) (16,336)    
Loans, net 167,180 214,248    
Loans held for sale 0 0    
Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 23,938 26,993    
Real Estate Construction 2,278 4,021    
Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 99,389 128,769    
Real Estate Construction 1,630 2,321    
Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 34,848 44,505    
Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 123,327 155,762    
Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 3,908 6,342    
Purchased Credit Impaired Loans [Member] | Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Consumer $ 18,823 $ 23,975    
v3.3.1.900
Loans (Analysis of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status $ 21,464  
Unpaid Principal Balance Nonaccrual Loans 32,263 $ 44,774
Recorded Investment Nonaccrual Loans   31,352
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 766  
Unpaid Principal Balance Nonaccrual Loans 990 3,930
Recorded Investment Nonaccrual Loans   2,939
Commercial business: Secured loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 9,395  
Unpaid Principal Balance Nonaccrual Loans 15,688 21,453
Recorded Investment Nonaccrual Loans   16,552
Commercial business: Unsecured loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 42  
Unpaid Principal Balance Nonaccrual Loans 256 269
Recorded Investment Nonaccrual Loans   247
Real estate: One-to-four family residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 820  
Unpaid Principal Balance Nonaccrual Loans 1,866 5,680
Recorded Investment Nonaccrual Loans   2,822
Real estate: Commercial and multifamily residential: Commercial land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 349  
Unpaid Principal Balance Nonaccrual Loans 332 1,113
Recorded Investment Nonaccrual Loans   821
Real estate: Commercial and multifamiIy residential: Income property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 2,843  
Unpaid Principal Balance Nonaccrual Loans 3,124 5,521
Recorded Investment Nonaccrual Loans   3,200
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 6,321  
Unpaid Principal Balance Nonaccrual Loans 8,943 5,837
Recorded Investment Nonaccrual Loans   3,826
Real estate construction: One-to-four family residential: Land and acquisition [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 362  
Unpaid Principal Balance Nonaccrual Loans 385 112
Recorded Investment Nonaccrual Loans   95
Real estate construction: One-to-four family residential: Residential construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 566  
Unpaid Principal Balance Nonaccrual Loans 679 370
Recorded Investment Nonaccrual Loans   370
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 0  
Unpaid Principal Balance Nonaccrual Loans $ 0 489
Recorded Investment Nonaccrual Loans   $ 480
v3.3.1.900
Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans $ 21,464  
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 766  
Commercial business: Secured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 9,395  
Commercial business: Unsecured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 42  
Real estate: One-to-four family residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 820  
Real estate: Commercial and multifamily residential: Commercial land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 349  
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 6,321  
Real estate construction: One-to-four family residential: Land and acquisition [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 362  
Real estate construction: One-to-four family residential: Residential construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 566  
Real estate: Commercial and multifamiIy residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 2,843  
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0  
Loans, Excluding Purchased Credit Impaired Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 5,592,208 $ 5,158,985
Total Past Due 20,449 24,457
Nonaccrual Loans 21,464 31,352
Loans Receivable, Net 5,634,121 5,214,794
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 83,634 73,783
Total Past Due 0 0
Nonaccrual Loans 0 0
Loans Receivable, Net 83,634 73,783
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 328,219 341,032
Total Past Due 3,377 1,061
Nonaccrual Loans 766 2,939
Loans Receivable, Net 332,362 345,032
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,241,069 2,004,418
Total Past Due 12,228 12,658
Nonaccrual Loans 9,395 16,552
Loans Receivable, Net 2,262,692 2,033,628
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 94,867 79,661
Total Past Due 39 185
Nonaccrual Loans 42 247
Loans Receivable, Net 94,948 80,093
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 170,913 167,197
Total Past Due 1,703 1,745
Nonaccrual Loans 820 2,822
Loans Receivable, Net 173,436 171,764
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 212,740 187,470
Total Past Due 69 1,488
Nonaccrual Loans 349 821
Loans Receivable, Net 213,158 189,779
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 939,396 839,689
Total Past Due 599 1,226
Nonaccrual Loans 6,321 3,826
Loans Receivable, Net 946,316 844,741
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 14,388 15,462
Total Past Due 0 953
Nonaccrual Loans 362 95
Loans Receivable, Net 14,750 16,510
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 119,809 97,821
Total Past Due 0 330
Nonaccrual Loans 566 370
Loans Receivable, Net 120,375 98,521
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 1,305,502 1,294,982
Total Past Due 2,434 3,817
Nonaccrual Loans 2,843 3,200
Loans Receivable, Net 1,310,779 1,301,999
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 81,671 57,470
Total Past Due 0 994
Nonaccrual Loans 0 480
Loans Receivable, Net 81,671 58,944
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 18,302 14,656
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,597 933
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 11,611 5,137
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 39 185
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,637 1,700
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 69 1,454
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 599 937
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 953
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 326
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,750 3,031
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,147 8,415
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 780 118
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 617 6,149
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 66 45
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 34
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 289
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 684 786
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 994
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 1,386
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 10
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 1,372
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 4
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 0 $ 0
v3.3.1.900
Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Modifications
Dec. 31, 2014
USD ($)
Modifications
Dec. 31, 2013
USD ($)
Modifications
Financing Receivable, Modifications, Number of Contracts | Modifications 7 8 12
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 5,618,041 $ 5,186,695  
Recorded Investment of Loans Individually Measured for Specific Impairment 16,080 28,099  
Recorded Investment 15 0  
Unpaid Principal Balance 15 0  
Related Allowance 15 0  
Impaired Financing Receivable, Average Recorded Investment 22,372 26,635 $ 32,039
Impaired Financing Receivable, Interest Income, Accrual Method $ 202 $ 1,327 $ 1,306
Commercial business: Secured loans [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 5 4 2
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 2,257,168 $ 2,023,104  
Recorded Investment of Loans Individually Measured for Specific Impairment 5,524 10,524  
Recorded Investment 690 99  
Unpaid Principal Balance 718 99  
Related Allowance 321 25  
Impaired Financing Receivable, Average Recorded Investment 7,987 7,345 $ 5,636
Impaired Financing Receivable, Interest Income, Accrual Method 84 36 19
Commercial business: Unsecured loans [Member]      
Recorded Investment of Loans Collectively Measured for Contingency Provision 94,948 80,091  
Recorded Investment of Loans Individually Measured for Specific Impairment 0 2  
Recorded Investment 0 2  
Unpaid Principal Balance 0 2  
Related Allowance 0 2  
Impaired Financing Receivable, Average Recorded Investment 0 19 61
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 1 $ 3
Real estate: One-to-four family residential [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 1 2 1
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 172,150 $ 169,619  
Recorded Investment of Loans Individually Measured for Specific Impairment 1,286 2,145  
Recorded Investment 314 424  
Unpaid Principal Balance 339 465  
Related Allowance 314 120  
Impaired Financing Receivable, Average Recorded Investment 2,848 2,094 $ 1,665
Impaired Financing Receivable, Interest Income, Accrual Method $ 47 $ 49 $ 63
Real estate: Commercial and multifamily residential: Commercial land [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 0 1
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 213,158 $ 189,779  
Recorded Investment of Loans Individually Measured for Specific Impairment 0 0  
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 94 82 $ 1,691
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0 $ 0
Real estate: Commercial and multifamiIy residential: Income property [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 1 4
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 1,308,673 $ 1,295,650  
Recorded Investment of Loans Individually Measured for Specific Impairment 2,106 6,349  
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 2,913 6,782 $ 8,910
Impaired Financing Receivable, Interest Income, Accrual Method $ 36 $ 270 $ 238
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 1 1
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 940,261 $ 835,895  
Recorded Investment of Loans Individually Measured for Specific Impairment 6,055 8,846  
Recorded Investment 0 582  
Unpaid Principal Balance 0 582  
Related Allowance 0 27  
Impaired Financing Receivable, Average Recorded Investment 7,052 9,472 $ 10,779
Impaired Financing Receivable, Interest Income, Accrual Method $ 26 $ 956 $ 971
Real estate construction: One-to-four family residential: Land and acquisition [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 0 1
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 14,283 $ 16,401  
Recorded Investment of Loans Individually Measured for Specific Impairment 467 109  
Recorded Investment 0 109  
Unpaid Principal Balance 0 109  
Related Allowance 0 67  
Impaired Financing Receivable, Average Recorded Investment 641 694 $ 2,624
Impaired Financing Receivable, Interest Income, Accrual Method 5 6 6
Real estate construction: One-to-four family residential: Residential construction [Member]      
Recorded Investment of Loans Collectively Measured for Contingency Provision 119,813 98,521  
Recorded Investment of Loans Individually Measured for Specific Impairment 562 0  
Recorded Investment 335 0  
Unpaid Principal Balance 335 0  
Related Allowance 3 0  
Impaired Financing Receivable, Average Recorded Investment 648 0 420
Impaired Financing Receivable, Interest Income, Accrual Method 0 0 $ 0
Real estate construction: Commercial and multifamily residential: Income property [Member]      
Recorded Investment of Loans Collectively Measured for Contingency Provision 83,634 73,783  
Recorded Investment of Loans Individually Measured for Specific Impairment 0 0  
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]      
Recorded Investment of Loans Collectively Measured for Contingency Provision 81,671 58,944  
Recorded Investment of Loans Individually Measured for Specific Impairment 0 0  
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance $ 0 $ 0  
Consumer [Member]      
Financing Receivable, Modifications, Number of Contracts | Modifications 1 0 2
Recorded Investment of Loans Collectively Measured for Contingency Provision $ 332,282 $ 344,908  
Recorded Investment of Loans Individually Measured for Specific Impairment 80 124  
Impaired Financing Receivable, Average Recorded Investment 189 147 $ 253
Impaired Financing Receivable, Interest Income, Accrual Method 4 9 $ 6
Impaired Loans Without Recorded Allowance [Member]      
Recorded Investment 14,726 26,883  
Unpaid Principal Balance 19,547 38,433  
Impaired Loans With Recorded Allowance [Member]      
Recorded Investment 1,354 1,216  
Unpaid Principal Balance 1,407 1,257  
Related Allowance 653 241  
Impaired Loans Without Recorded Allowance [Member]      
Recorded Investment 65 124  
Unpaid Principal Balance 139 201  
Impaired Loans Without Recorded Allowance [Member] | Commercial business: Secured loans [Member]      
Recorded Investment 4,834 10,425  
Unpaid Principal Balance 6,455 12,410  
Impaired Loans Without Recorded Allowance [Member] | Commercial business: Unsecured loans [Member]      
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Impaired Loans Without Recorded Allowance [Member] | Real estate: One-to-four family residential [Member]      
Recorded Investment 972 1,721  
Unpaid Principal Balance 1,397 2,370  
Impaired Loans Without Recorded Allowance [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]      
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Impaired Loans Without Recorded Allowance [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]      
Recorded Investment 2,106 6,349  
Unpaid Principal Balance 2,311 10,720  
Impaired Loans Without Recorded Allowance [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]      
Recorded Investment 6,055 8,264  
Unpaid Principal Balance 8,528 12,732  
Impaired Loans Without Recorded Allowance [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]      
Recorded Investment 467 0  
Unpaid Principal Balance 490 0  
Impaired Loans Without Recorded Allowance [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]      
Recorded Investment 227 0  
Unpaid Principal Balance 227 0  
Impaired Loans Without Recorded Allowance [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]      
Recorded Investment 0 0  
Unpaid Principal Balance 0 0  
Impaired Loans Without Recorded Allowance [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]      
Recorded Investment 0 0  
Unpaid Principal Balance $ 0 $ 0  
v3.3.1.900
Loans Loans (Analysis of Troubled Debt Restructurings) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
contract
Modifications
Dec. 31, 2014
USD ($)
contract
Modifications
Dec. 31, 2013
USD ($)
contract
Modifications
Financing Receivable, Modifications [Line Items]      
Financing Receivable Modifications Additional Commitment To Lend $ 0 $ 0 $ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract 0 0 0
FHLB Advances, Collateral Pledged $ 1,399,201 $ 1,083,879  
Loans, Excluding Purchased Credit Impaired Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 7 8 12
Pre-Modification Outstanding Recorded Investment $ 3,808 $ 2,892 $ 1,968
Post-Modification Outstanding Recorded Investment $ 3,790 $ 2,875 $ 1,968
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 5 4 2
Pre-Modification Outstanding Recorded Investment $ 3,724 $ 759 $ 190
Post-Modification Outstanding Recorded Investment $ 3,706 $ 759 $ 190
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 1 2 1
Pre-Modification Outstanding Recorded Investment $ 30 $ 494 $ 113
Post-Modification Outstanding Recorded Investment $ 30 $ 494 $ 113
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 0 1
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 137
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 137
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 1 4
Pre-Modification Outstanding Recorded Investment $ 0 $ 143 $ 1,186
Post-Modification Outstanding Recorded Investment $ 0 $ 126 $ 1,186
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 1 1
Pre-Modification Outstanding Recorded Investment $ 0 $ 1,496 $ 172
Post-Modification Outstanding Recorded Investment $ 0 $ 1,496 $ 172
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 0 0 1
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 117
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 117
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | Modifications 1 0 2
Pre-Modification Outstanding Recorded Investment $ 54 $ 0 $ 53
Post-Modification Outstanding Recorded Investment $ 54 $ 0 $ 53
v3.3.1.900
Loans Loans, analysis of purchased credit impaired loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Allowance $ 68,172 $ 69,569 $ 72,454 $ 82,300
Loans and Leases Receivable, Net Amount 5,746,855 5,375,809    
Real estate: One-to-four family residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Allowance 916 2,281 1,252 694
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Allowance 3,531 3,180 $ 2,547 $ 2,437
Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 197,350 256,468    
Valuation discount resulting from acquisition accounting 16,444 25,884    
Loans and Leases Receivable, Allowance 13,726 16,336    
Loans and Leases Receivable, Net Amount 167,180 214,248    
Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 38,784 50,334    
Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 27,195 31,981    
Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 106,308 140,398    
Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 133,503 172,379    
Purchased Credit Impaired Loans [Member] | One-to-Four Family Residential Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 2,326 4,353    
Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,834 2,588    
Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 4,160 6,941    
Purchased Credit Impaired Loans [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount $ 20,903 $ 26,814    
v3.3.1.900
Loans Loans (Analysis of Purchased Credit Impaired - Accretable Yield Rollforward) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans, Analysis of Purchased Credit Impaired Loans, Accretable Yield Rollforward [Abstract]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield $ 58,981 $ 73,849 $ 103,907 $ 166,888
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (21,919) (36,066) (51,816)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans 1,681 3,386 6,898  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference $ 8,732 $ 9,394 $ (4,267)  
v3.3.1.900
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Narrative) (Details)
 12 Months Ended
Dec. 31, 2015
Maximum [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Percentage of unallocated loan amount 5.00%
v3.3.1.900
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 69,569       $ 72,454 $ 69,569 $ 72,454 $ 82,300
Charge-offs                 (25,067) (24,722) (23,941)
Recoveries                 15,079 15,110 14,196
Provision (recapture) for loan and lease losses $ 2,349 $ 2,831 $ 2,202 1,209 $ 1,708 $ 980 $ 2,117 1,922 8,591 6,727 (101)
Balance at the end of year 68,172       69,569       68,172 69,569 72,454
Specific Reserve 653       241       653 241 1,690
General Allocation 67,519       69,328       67,519 69,328 70,764
Consumer [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       3,180       2,547 3,180 2,547 2,437
Charge-offs                 (2,066) (2,774) (2,242)
Recoveries                 931 1,353 552
Provision (recapture) for loan and lease losses                 1,486 2,054 1,800
Balance at the end of year 3,531       3,180       3,531 3,180 2,547
Specific Reserve 15       0       15 0 4
General Allocation 3,516       3,180       3,516 3,180 2,543
Purchased Credit Impaired Loans [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       16,336       20,174 16,336 20,174 30,056
Charge-offs                 (13,854) (14,436) (13,853)
Recoveries                 7,329 7,721 7,232
Provision (recapture) for loan and lease losses                 3,915 2,877 (3,261)
Balance at the end of year 13,726       16,336       13,726 16,336 20,174
Specific Reserve 0       0       0 0 0
General Allocation 13,726       16,336       13,726 16,336 20,174
Unallocated Financing Receivables [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       1,844       1,655 1,844 1,655 1,011
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision (recapture) for loan and lease losses                 (1,275) 189 644
Balance at the end of year 569       1,844       569 1,844 1,655
Specific Reserve 0       0       0 0 0
General Allocation 569       1,844       569 1,844 1,655
Commercial business: Secured loans [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       25,923       31,027 25,923 31,027 27,270
Charge-offs                 (7,486) (4,159) (4,148)
Recoveries                 2,069 2,637 1,512
Provision (recapture) for loan and lease losses                 11,815 (3,582) 6,393
Balance at the end of year 32,321       25,923       32,321 25,923 31,027
Specific Reserve 321       25       321 25 343
General Allocation 32,000       25,898       32,000 25,898 30,684
Commercial business: Unsecured loans [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       927       696 927 696 753
Charge-offs                 (780) (130) (794)
Recoveries                 267 370 932
Provision (recapture) for loan and lease losses                 885 (9) (195)
Balance at the end of year 1,299       927       1,299 927 696
Specific Reserve 0       2       0 2 35
General Allocation 1,299       925       1,299 925 661
Real estate: One-to-four family residential [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       2,281       1,252 2,281 1,252 694
Charge-offs                 (376) (230) (228)
Recoveries                 307 159 270
Provision (recapture) for loan and lease losses                 (1,296) 1,100 516
Balance at the end of year 916       2,281       916 2,281 1,252
Specific Reserve 314       120       314 120 138
General Allocation 602       2,161       602 2,161 1,114
Real estate: Commercial and multifamily residential: Commercial land [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       799       489 799 489 460
Charge-offs                 0 (29) (20)
Recoveries                 291 70 169
Provision (recapture) for loan and lease losses                 88 269 (120)
Balance at the end of year 1,178       799       1,178 799 489
Specific Reserve 0       0       0 0 0
General Allocation 1,178       799       1,178 799 489
Real estate: Commercial and multifamiIy residential: Income property [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       9,159       9,234 9,159 9,234 11,033
Charge-offs                 (390) (1,934) (1,405)
Recoveries                 3,568 819 489
Provision (recapture) for loan and lease losses                 (5,721) 1,040 (883)
Balance at the end of year 6,616       9,159       6,616 9,159 9,234
Specific Reserve 0       0       0 0 26
General Allocation 6,616       9,159       6,616 9,159 9,208
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       5,007       3,605 5,007 3,605 6,362
Charge-offs                 (115) (1,030) (1,118)
Recoveries                 116 51 375
Provision (recapture) for loan and lease losses                 542 2,381 (2,014)
Balance at the end of year 5,550       5,007       5,550 5,007 3,605
Specific Reserve 0       27       0 27 1,073
General Allocation 5,550       4,980       5,550 4,980 2,532
Real estate construction: One-to-four family residential: Land and acquisition [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       1,197       610 1,197 610 1,171
Charge-offs                 0 0 (32)
Recoveries                 103 740 2,553
Provision (recapture) for loan and lease losses                 (961) (153) (3,082)
Balance at the end of year 339       1,197       339 1,197 610
Specific Reserve 0       67       0 67 71
General Allocation 339       1,130       339 1,130 539
Real estate construction: One-to-four family residential: Residential construction [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       1,860       822 1,860 822 635
Charge-offs                 0 0 (101)
Recoveries                 90 1,190 112
Provision (recapture) for loan and lease losses                 (1,217) (152) 176
Balance at the end of year 733       1,860       733 1,860 822
Specific Reserve 3       0       3 0 0
General Allocation 730       1,860       730 1,860 822
Real estate construction: Commercial and multifamily residential: Income property [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       622       285 622 285 316
Charge-offs                 0 0 0
Recoveries                 8 0 0
Provision (recapture) for loan and lease losses                 (242) 337 (31)
Balance at the end of year 388       622       388 622 285
Specific Reserve 0       0       0 0 0
General Allocation 388       622       388 622 285
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 434       $ 58 434 58 102
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision (recapture) for loan and lease losses                 572 376 (44)
Balance at the end of year 1,006       434       1,006 434 58
Specific Reserve 0       0       0 0 0
General Allocation $ 1,006       $ 434       $ 1,006 $ 434 $ 58
v3.3.1.900
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Changes in the Allowance for Unfunded Commitments and Letters of Credit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit      
Beginning balance $ 2,655 $ 2,505 $ 1,915
Net changes in the allowance for unfunded commitments and letters of credit 275 150 590
Ending balance $ 2,930 $ 2,655 $ 2,505
v3.3.1.900
Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of Loan Portfolio) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance $ 68,172 $ 69,569 $ 72,454 $ 82,300
Loans, net 5,746,855 5,375,809    
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 5,634,121 5,214,794    
Loans and Leases Receivable, Allowance 54,446 53,233    
Loans, net 5,579,675 5,161,561    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 197,350 256,468    
Valuation discount resulting from acquisition accounting 16,444 25,884    
Loans and Leases Receivable, Allowance 13,726 16,336    
Loans, net 167,180 214,248    
Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 5,461,639 5,086,653    
Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 178,904 216,807    
Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 80,599 34,967    
Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 362 3,175    
Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 91,883 93,174    
Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 18,084 36,486    
Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 38,784 50,334    
Commercial business: Secured loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 32,321 25,923 31,027 27,270
Commercial business: Secured loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 2,262,692 2,033,628    
Commercial business: Secured loans [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 37,564 48,087    
Commercial business: Secured loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 2,146,729 1,963,210    
Commercial business: Secured loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 31,468 37,927    
Commercial business: Secured loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 59,746 15,790    
Commercial business: Secured loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 101 937    
Commercial business: Secured loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 56,217 54,628    
Commercial business: Secured loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 5,995 9,223    
Commercial business: Secured loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Secured loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Secured loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Secured loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Unsecured loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 1,299 927 696 753
Commercial business: Unsecured loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 94,948 80,093    
Commercial business: Unsecured loans [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,220 2,247    
Commercial business: Unsecured loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 93,347 79,534    
Commercial business: Unsecured loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,218 2,156    
Commercial business: Unsecured loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 278 0    
Commercial business: Unsecured loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Unsecured loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,323 559    
Commercial business: Unsecured loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 2 91    
Commercial business: Unsecured loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Unsecured loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Unsecured loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Commercial business: Unsecured loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 133,503 172,379    
Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 916 2,281 1,252 694
Real estate: One-to-four family residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 173,436 171,764    
Real estate: One-to-four family residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 27,195 31,981    
Real estate: One-to-four family residential [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 171,945 163,914    
Real estate: One-to-four family residential [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 25,018 28,822    
Real estate: One-to-four family residential [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 52 55    
Real estate: One-to-four family residential [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: One-to-four family residential [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,439 7,795    
Real estate: One-to-four family residential [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 2,177 3,159    
Real estate: One-to-four family residential [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: One-to-four family residential [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: One-to-four family residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: One-to-four family residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamily residential: Commercial land [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 1,178 799 489 460
Real estate: Commercial and multifamily residential: Commercial land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 213,158 189,779    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 8,898 15,344    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 207,768 183,701    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 8,234 9,104    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 4,966 4,217    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 424 1,861    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 664 6,240    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamily residential: Commercial land [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Income property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 6,616 9,159 9,234 11,033
Real estate: Commercial and multifamiIy residential: Income property [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,310,779 1,301,999    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 42,342 60,513    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,296,043 1,287,729    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 36,426 51,435    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 5,889 5,885    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 1,892    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 8,847 8,385    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 5,916 7,186    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Income property [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 5,550 5,007 3,605 6,362
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 946,316 844,741    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 55,068 64,541    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 918,986 825,694    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 53,071 58,629    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 9,668 7,876    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 261 346    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 17,662 11,171    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,736 5,566    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 4,160 6,941    
Real estate construction: One-to-four family residential: Land and acquisition [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 339 1,197 610 1,171
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 14,750 16,510    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,565 2,508    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 14,388 15,307    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,086 1,595    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 167    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 362 1,036    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 479 913    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Land and acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Residential construction [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 733 1,860 822 635
Real estate construction: One-to-four family residential: Residential construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 120,375 98,521    
Real estate construction: One-to-four family residential: Residential construction [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 761 1,845    
Real estate construction: One-to-four family residential: Residential construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 119,243 96,031    
Real estate construction: One-to-four family residential: Residential construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 427 741    
Real estate construction: One-to-four family residential: Residential construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 909    
Real estate construction: One-to-four family residential: Residential construction [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Residential construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,132 1,581    
Real estate construction: One-to-four family residential: Residential construction [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 334 1,104    
Real estate construction: One-to-four family residential: Residential construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Residential construction [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Residential construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: One-to-four family residential: Residential construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 388 622 285 316
Real estate construction: Commercial and multifamily residential: Income property [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 83,634 73,783    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,303 1,662    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 83,634 73,783    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 1,303 1,435    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 227    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Income property [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 1,006 434 58 102
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 81,671 58,944    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 531 926    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 81,270 58,055    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 531 926    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 401 889    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Allowance 3,531 3,180 $ 2,547 $ 2,437
Consumer [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 332,362 345,032    
Consumer [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 20,903 26,814    
Consumer [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 328,286 339,695    
Consumer [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 20,122 24,037    
Consumer [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 68    
Consumer [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Consumer [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 4,076 5,269    
Consumer [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 781 2,777    
Consumer [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Consumer [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Consumer [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Consumer [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount $ 0 $ 0    
v3.3.1.900
Other Real Estate Owned (Summary of Other Real Estate Owned) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Other Real Estate Owned [Line Items]    
Balance, beginning of period $ 22,190 $ 35,927
Other Real Estate Owned, established through acquisition 0 2,752
Transfers in 8,688 10,200
Valuation adjustments (1,986) (4,039)
Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans 19,292 28,559
Net realized gain on sale of other real estate owned 4,138 5,909
Balance, end of period 13,738 $ 22,190
Mortgage Loans in Process of Foreclosure, Amount 1,300  
Real estate: One-to-four family residential [Member]    
Other Real Estate Owned [Line Items]    
Balance, end of period $ 2,400  
v3.3.1.900
FDIC Loss-sharing Asset and Covered Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Payment Of Clawback If Losses Less Than Stated Levels, Period After Acquisition                 10 years 45 days    
Amount of estimated clawback liability $ 5,154       $ 4,200       $ 5,154 $ 4,200  
Provision (recapture) for loan and lease losses 2,349 $ 2,831 $ 2,202 $ 1,209 1,708 $ 980 $ 2,117 $ 1,922 8,591 6,727 $ (101)
Federal deposit insurance corporation loss-sharing indemnified assets 6,000       13,100       6,000 13,100  
Federal deposit insurance corporation loss-sharing indemnified assets receivable 605       2,100       605 2,100  
FDIC Indemnification Asset 6,568       $ 15,174       6,568 15,174  
FDIC Loss-sharing Asset, Write-downs of Other Real Estate                 1,158 $ 1,065  
Non-Single Family Covered Assets 110,819               110,819    
Single Family Covered Assets $ 39,022               $ 39,022    
Maximum [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Loss Recovery Provision Effective Years                 10 years    
Loss Sharing Agreement Effective Years                 10 years    
Minimum [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Loss Recovery Provision Effective Years                 8 years    
Loss Sharing Agreement Effective Years                 5 years    
Covered Loans [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Percentage of loss shared by FDIC When Loss Share Thresholds Met         95.00%         95.00%  
Percentage of loss shared by FDIC 80.00%               80.00%    
FDIC Percentage Of Loss Recoveries 80.00%       95.00%       80.00% 95.00%  
Fdic Loss Sharing Asset [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
FDIC Indemnification Asset $ 6,568       $ 15,174       $ 6,568 $ 15,174 $ 39,846
FDIC Loss-sharing Asset, Cash Payments Received                 2,794 2,499  
FDIC Loss-sharing Asset, Net Reimbursable Losses                 (1,802) (2,184)  
FDIC Loss-sharing Asset, Amortization, Net                 (6,184) (21,279)  
FDIC Loss-sharing Asset, Impairment (Recapture) of Loans                 2,268 2,301  
FDIC Loss-sharing Asset, Disposals                 1,237 2,179  
FDIC Loss-sharing Asset, Other                 (15) $ 103  
Columbia River Bank [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Amount of estimated clawback liability 3,248               3,248    
FDIC Indemnification Asset 130               130    
Non-Single Family Covered Assets 73,707               73,707    
Single Family Covered Assets 8,114               8,114    
American Marine Bank [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Amount of estimated clawback liability 1,227               1,227    
FDIC Indemnification Asset 2,598               2,598    
Non-Single Family Covered Assets 12,111               12,111    
Single Family Covered Assets 22,962               22,962    
Summit Bank [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Amount of estimated clawback liability 0               0    
FDIC Indemnification Asset 1,886               1,886    
Non-Single Family Covered Assets 9,405               9,405    
Single Family Covered Assets 6,180               6,180    
First Heritage Bank [Member]                      
Covered Assets And FDIC Loss Sharing Asset [Line Items]                      
Amount of estimated clawback liability 679               679    
FDIC Indemnification Asset 1,954               1,954    
Non-Single Family Covered Assets 15,596               15,596    
Single Family Covered Assets $ 1,766               $ 1,766    
v3.3.1.900
Premises and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 221,401 $ 221,525  
Less accumulated depreciation and amortization (57,162) (49,435)  
Total 164,239 172,090  
Depreciation and amortization expense 12,300 10,900 $ 10,200
exit or disposal activity total expected cost 2,100    
Exit or disposal cost, amount incurred in current period 514    
Exit or disposal costs, remaining amount to be incurred in future periods 1,600    
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 51,446 52,338  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 102,808 103,240  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 20,604 21,199  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 28,662 28,486  
Vehicles [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 587 596  
Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 17,294 $ 15,666  
v3.3.1.900
Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 919 $ 919 $ 919
Intangible Assets, Net (Excluding Goodwill) 23,577 30,459 25,852
Goodwill and Intangible Assets [Roll Forward]      
Total goodwill, beginning of period 382,537 343,952 115,554
Established through acquisitions 225 38,585 228,398
Total goodwill, end of period 382,762 382,537 343,952
Core deposit intangible, net, beginning of period 30,459    
CDI current period amortization (6,882) (6,293) (6,045)
Total core deposit intangible, end of period 23,577 30,459  
Total goodwill and intangible assets, end of period 406,339 412,996 369,804
Core Deposits [Member]      
Goodwill and Intangible Assets [Roll Forward]      
Gross core deposit intangible balance, beginning of period 58,598 47,698 32,441
Accumulated amortization, beginning of period (29,058) (22,765) (16,720)
Core deposit intangible, net, beginning of period 29,540 24,933 15,721
Established through acquisitions 0 10,900 15,257
CDI current period amortization (6,882) (6,293) (6,045)
Total core deposit intangible, end of period $ 22,658 $ 29,540 $ 24,933
Estimated life of CDI, in years 10 years    
v3.3.1.900
Goodwill and Intangible Assets (Summary of Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) - Core Deposits [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Future Amortization Expense For Core Deposit Intangibles  
2016 $ 5,945
2017 4,913
2018 3,855
2019 2,951
2020 $ 2,048
v3.3.1.900
Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deposits [Abstract]    
Brokered money market accounts $ 100,854 $ 83,402
Demand and other noninterest-bearing 3,507,358 2,651,373
Interest-bearing demand 925,909 1,304,258
Money market 1,788,552 1,760,331
Savings 657,016 615,721
Certificates of deposit less than $100,000 249,031 288,261
Total core deposits 7,127,866 6,619,944
Certificates of deposit greater than $100,000 182,973 202,014
Certificates of deposit insured by CDARS® 26,901 18,429
Subtotal 7,438,594 6,923,789
Deposits, Valuation Adjustment From Acquisition Accounting 235 933
Total deposits 7,438,829 6,924,722
Deposit Liabilities Reclassified as Loans Receivable 1,800 $ 1,300
Time Deposits, Fiscal Year Maturity [Abstract]    
2016 168,149  
2017 25,703  
2018 4,837  
2019 4,161  
2020 6,803  
Thereafter 221  
Total $ 209,874  
v3.3.1.900
Federal Home Loan Bank and Federal Reserve Bank Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
FHLB Fixed Rate Advances, Maturities Summary [Abstract]      
FHLB Fixed Rate Advances, Weighted Average Interest Rate, Within 1 year 0.34%    
FHLB Fixed Rate Advances, Amount, Within 1 year $ 62,000    
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One To Five Years From Balance Sheet Date 5.66%    
FHLB Fixed Rate Advances, Over 1 through 5 years $ 1,000    
FHLB Fixed Rate Advances, Weighted Average Interest Rate, Due after 10 years 5.37%    
FHLB Fixed Rate Advances, Due after 10 years $ 5,000    
FHLB Fixed Rate Advances, Total Amount before valuation adjustment 68,000    
Valuation adjustment from acquisition accounting 531    
FHLB Fixed Rate Advances, Total Amount 68,531    
Federal Home Loan Bank, Advances, Activity for Year [Abstract]      
FHLB Advances 68,531 $ 216,568 $ 36,606
Average balance during the year 70,678 44,876 51,030
Maximum month-end balance during the year $ 242,556 $ 216,568 $ 190,631
Weighted average rate during the year 0.68% 0.74% 1.12%
Weighted average rate at December 31 0.79% 0.41% 1.09%
FHLB Advances, Collateral Pledged $ 1,399,201 $ 1,083,879  
FHLB Borrowing Capacity 1,328,971 865,138  
Federal Reserve Bank, Advances, Activity for Year [Abstract]      
Federal Reserve Bank, Advances, Collateral Pledged 85,428 86,130  
Federal Reserve Bank borrowing capacity 85,428 86,130  
Securities Investment [Member]      
Federal Reserve Bank, Advances, Activity for Year [Abstract]      
Federal Reserve Bank, Advances, Collateral Pledged 47,516 40,128  
Loans Receivable [Member]      
Federal Home Loan Bank, Advances, Activity for Year [Abstract]      
FHLB Advances, Collateral Pledged 1,399,201 1,083,879  
Commercial Loan [Member]      
Federal Reserve Bank, Advances, Activity for Year [Abstract]      
Federal Reserve Bank, Advances, Collateral Pledged $ 37,912 $ 46,002  
v3.3.1.900
Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying amount of securities pledged as collateral $ 533,399 $ 526,643
Available-for-sale Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Sweep, Interest rate 0.11%  
Assets Sold under Agreements to Repurchase, Sweep, Carrying Amount $ 74,700  
Assets Sold under Agreements to Repurchase, Term, Carrying Amounts $ 25,000  
Assets Sold under Agreements to Repurchase, Term, Interest Rate 1.88%  
Repurchase Agreements, Sweep [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying amount of securities pledged as collateral $ 86,000  
Repurchase Agreements,Term [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying amount of securities pledged as collateral $ 28,200  
v3.3.1.900
Other Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Nov. 01, 2014
Subordinated Borrowing [Line Items]      
Repayments of subordinated debt, Intermountain Statutory Trust I   $ 8,300  
Other borrowings $ 0 $ 8,248  
Subordinated Borrowing, Interest Rate 3.03%    
Intermountain Community Bancorp [Member]      
Subordinated Borrowing [Line Items]      
Business Combination, Purchase Price Allocation, Junior Subordinated Debentures     $ 16,500
v3.3.1.900
Derivatives and Balance Sheet Offsetting (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement $ 99,699,000    
Gain (Loss) on Derivative Instruments, Net, Pretax 11,000 $ (51,000) $ 0
Secured Borrowings, Gross, Difference, Amount 0    
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 264,400,000 215,600,000  
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset 12,438,000 11,800,000  
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Liability 12,478,000 $ 11,851,000  
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]      
Derivative [Line Items]      
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement 99,699,000    
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member] | Maturity Overnight [Member]      
Derivative [Line Items]      
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement 74,699,000    
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member] | Maturity Less than 30 Days [Member]      
Derivative [Line Items]      
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement 0    
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member] | Maturity 30 to 90 Days [Member]      
Derivative [Line Items]      
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement 0    
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member] | Maturity Greater than 90 Days [Member]      
Derivative [Line Items]      
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement $ 25,000,000    
v3.3.1.900
Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Offsetting [Line Items]    
Repurchase agreements, amounts offset in balance sheet $ 0 $ 0
repurchase agreements, net amount presented in statement of financial position 99,699 105,080
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities (99,699) (105,080)
securities sold under agreements to repurchase, amount not offset 0 0
Interest Rate Contracts [Member]    
Balance Sheet Offsetting [Line Items]    
Derivative Assets, Gross Amounts Offset in the Balance Sheets 0 0
Derivative Asset 12,438 11,800
Derivative, Collateral, Obligation to Return Securities 0 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 12,438 11,800
Derivative Liability, Gross Amounts Offset in Balance Sheets 0 0
Derivative Liability 12,478 11,851
Derivative, Collateral, Right to Reclaim Securities (12,478) (11,851)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 0 0
Available-for-sale Securities [Member]    
Balance Sheet Offsetting [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount $ 99,699 $ 105,080
v3.3.1.900
Employee Benefit Plans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
years
period
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Employee Benefit [Line Items]      
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation $ 0 $ 511  
Number of Look-back Period Under Employee Stock Purchase Plan | period 2    
Look-back Period Under Employee Stock Purchase Plan 6 months    
Discount On Common Stock Under Employee Stock Purchase Plan, Percent 10.00%    
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares 42,134 34,168 32,598
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 1,200 $ 904 $ 686
Shares Available For Purchase Under Employee Stock Purchase Plan | shares 499,610    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year $ 16,541 16,423  
Change in actuarial loss 4,874 0  
Defined Benefit Plan, Plan Amendments 2,617 0  
Benefit expense 2,491 1,325  
Benefit payments (979) (1,718)  
Balance at end of year $ 25,544 16,541 16,423
Pension Plan [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Service Period 3    
Deferred Compensation Arrangement with Individual, Contribution To Plan By Employee, Percent Of Eligible Compensation 75.00%    
Deferred Compensation Arrangement with Individual, Contribution Requirements, Matching Percent 50.00%    
Deferred Compensation Arrangement with Individual, Employer Contribution $ 2,300 2,000 1,900
Pension Plan [Member] | Minimum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Eligible Age | years 18    
Pension Plan [Member] | Maximum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Contribution Requirements, Percent Of Each Employee Compensation 3.00%    
Deferred Profit Sharing [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Service Period 3    
Deferred Compensation Arrangement with Individual, Contribution To Plan By Employee, Percent Of Eligible Compensation 75.00%    
Deferred Compensation Arrangement with Individual, Contribution Requirements, Matching Percent 50.00%    
Deferred Compensation Arrangement with Individual, Employer Contribution $ 5,200 4,400 4,000
Deferred Profit Sharing [Member] | Minimum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Eligible Age | years 18    
Deferred Profit Sharing [Member] | Maximum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Contribution Requirements, Percent Of Each Employee Compensation 3.00%    
ESP Plan [Member]      
Employee Benefit [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date 90.00%    
Unit Plans [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Recorded Liability $ 4,900 4,800  
Deferred Compensation Arrangement with Individual, Compensation Expense $ 859 $ 588 $ 458
Unit Plans [Member] | Minimum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Vesting Period 4 years    
Deferred Compensation Arrangement with Individual, Benefit Period 5 years    
Unit Plans [Member] | Maximum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Vesting Period 10 years    
Deferred Compensation Arrangement with Individual, Benefit Period 10 years    
SERP [Member]      
Employee Benefit [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.26% 5.10%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Normal Retirement Age | years 65    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Annual Cost Of Living Benefit Adjustment 2.00%    
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]      
2016 $ 994    
2017 1,128    
2018 1,510    
2019 1,548    
2020 2,568    
2021 through 2025 10,492    
Total $ 18,240    
v3.3.1.900
Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Minimum future rental payments:      
2016 $ 6,774    
2017 5,621    
2018 4,983    
2019 4,606    
2020 3,810    
Thereafter 13,968    
Total minimum payments 39,762    
Operating Leases, Rent Expense, Sublease Rentals 1,100 $ 756 $ 673
Operating Leases, Rent Expense, Net 7,400 8,300 $ 8,500
Commitments to Extend Credit [Member]      
Minimum future rental payments:      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 1,930,000 1,580,000  
Standby Letters of Credit [Member]      
Minimum future rental payments:      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 38,700 36,700  
Commercial Letter of Credit and other off-balance sheet liabilities [Member]      
Minimum future rental payments:      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 5,000 $ 0  
v3.3.1.900
Shareholders' Equity (Details) - $ / shares
 12 Months Ended
Jan. 29, 2016
Oct. 29, 2015
Jul. 23, 2015
Apr. 22, 2015
Jan. 29, 2015
Apr. 02, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Class of Stock [Line Items]                  
Preferred Stock Converted Into Common Stock, Shares                 102,363
Declared quarterly cash dividend   $ 0.18 $ 0.18 $ 0.18 $ 0.16        
Special Dividends Payable, Amount Per Share   $ 0.18 $ 0.16 $ 0.16 $ 0.14        
Dividend Declared [Member]                  
Class of Stock [Line Items]                  
Declared quarterly cash dividend $ 0.18                
Special Dividends Payable, Amount Per Share $ 0.20                
Preferred Stock [Member]                  
Class of Stock [Line Items]                  
Stock Issued During Period, Shares, New Issues           8,782 0 9,000  
v3.3.1.900
Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (6,295) $ 5,621 $ (12,044) $ 20,149
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (11,123) 17,922 (32,159)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] (793) (257) (34)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (11,916) 17,665 (32,193)  
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 386 7,462 (10,108) 20,918
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6,069) 17,922 (30,727)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] (1,007) (352) (299)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (7,076) 17,570 (31,026)  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (6,681) (1,841) (1,936) $ (769)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (5,054) 0 (1,432)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 214 95 265  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent $ (4,840) $ 95 $ (1,167)  
[1] (2) See following table for details about these reclassifications.
v3.3.1.900
Accumulated Other Comprehensive Income Amounts reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Gain on sale of investment securities, net                 $ 1,581 $ 552 $ 462
Income before income taxes $ 37,338 $ 37,295 $ 31,799 $ 35,188 $ 28,087 $ 31,188 $ 29,870 $ 28,640 141,620 117,785 87,010
Income Tax Expense (Benefit) (10,598) (11,515) (9,853) (10,827) (9,167) (9,605) (8,643) (8,796) (42,793) (36,211) (26,994)
Net income $ 26,740 $ 25,780 $ 21,946 $ 24,361 $ 18,920 $ 21,583 $ 21,227 $ 19,844 98,827 81,574 60,016
Compensation and employee benefits                 149,410 130,864 125,432
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Gain on sale of investment securities, net                 1,581 552 462
Income before income taxes                 1,581 552 462
Income Tax Expense (Benefit)                 (574) (200) (163)
Net income                 1,007 352 299
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income before income taxes                 (336) (149) (400)
Income Tax Expense (Benefit)                 122 54 135
Net income                 (214) (95) (265)
Compensation and employee benefits                 $ (336) $ (149) $ (400)
v3.3.1.900
Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 2,157,694 $ 2,098,257
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,157,694 2,098,257
Other assets (Interest rate contracts) 12,438 11,800
Other liabilities (Interest rate contracts) 12,478 11,851
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 20,137 20,499
Other assets (Interest rate contracts) 0 0
Other liabilities (Interest rate contracts) 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,137,557 2,077,758
Other assets (Interest rate contracts) 12,438 11,800
Other liabilities (Interest rate contracts) 12,478 11,851
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Other assets (Interest rate contracts) 0 0
Other liabilities (Interest rate contracts) 0 0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,286,489 1,162,387
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,286,489 1,162,387
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 492,169 496,484
State and Municipal Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
State and Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 492,169 496,484
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
U.S. Government Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 353,782 413,706
U.S. Government Agency [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
U.S. Government Agency [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 353,782 413,706
U.S. Government Agency [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 20,137 20,499
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 20,137 20,499
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Other Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 5,117 5,181
Other Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 5,117 5,181
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 0 $ 0
v3.3.1.900
Fair Value Accounting and Measurement (Financial Assets Accounted For Fair Value On Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans $ 758  
Other Real Estate Owned Fair Value 4,524 $ 5,365
Losses During Period 1,602 1,008
Assets, Fair Value Disclosure 5,282 5,365
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0  
Other Real Estate Owned Fair Value 0 0
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0  
Other Real Estate Owned Fair Value 0 0
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 758  
Other Real Estate Owned, Fair Value Disclosure 4,524 5,365
Other Real Estate Owned Fair Value 4,524 5,365
Assets, Fair Value Disclosure 5,282 5,365
Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses During Period 653  
Other Real Estate Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses During Period $ 949 $ 1,008
v3.3.1.900
Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets during 2015 and 2014, along with the valuation techniques used, are shown in the following tables:
 
 
Fair value  at
December 31, 2015
 
Valuation Technique
 
Unobservable Input
 
Range (Weighted Average) (1)
 
 
(dollars in thousands)
Impaired loans - real estate collateral
 
$
380

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
Impaired loans - other collateral (3)
 
378

 
Fair Market Value of Collateral
 
Adjustment to Stated Value
 
N/A (2)
OREO
 
4,524

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of equipment and life insurance).
(2) Quantitative disclosures are not provided because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of equipment and life insurance.

 
 
Fair value  at
December 31, 2014
 
Valuation Technique
 
Unobservable Input
 
Range (Weighted Average) (1)
 
 
(dollars in thousands)
OREO
 
$
5,365

 
Fair Market Value of Collateral
 
Adjustment to Appraisal Value
 
N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal value during the current period.
  
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans $ 758  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 758  
Other Real Estate Owned, Fair Value Disclosure $ 4,524 $ 5,365
v3.3.1.900
Fair Value Accounting and Measurement Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets    
Interest-earning deposits with banks $ 8,373 $ 16,949
Securities available for sale 2,157,694 2,098,257
Reported Value Measurement [Member]    
Assets    
Cash and due from banks 166,929 171,221
Interest-earning deposits with banks 8,373 16,949
Securities available for sale 2,157,694 2,098,257
FHLB stock 12,722 33,365
Loans held for sale 4,509 1,116
Loans 5,746,855 5,375,809
FDIC loss-sharing asset 6,568 15,174
Interest rate contracts 12,438 11,800
Liabilities    
Deposits 7,438,829 6,924,722
FHLB Advances 68,531 216,568
Repurchase agreements 99,699 105,080
Other borrowings   8,248
Interest rate contracts 12,478 11,851
Estimate of Fair Value Measurement [Member]    
Assets    
Cash and due from banks 166,929 171,221
Interest-earning deposits with banks 8,373 16,949
Securities available for sale 2,157,694 2,098,257
FHLB stock 12,722 33,365
Loans held for sale 4,509 1,116
Loans 5,752,423 5,516,286
FDIC loss-sharing asset 921 4,054
Interest rate contracts 12,438 11,800
Liabilities    
Deposits 7,434,787 6,921,804
FHLB Advances 69,176 217,296
Repurchase agreements 100,346 106,171
Other borrowings   8,248
Interest rate contracts 12,478 11,851
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Assets    
Cash and due from banks 166,929 171,221
Interest-earning deposits with banks 8,373 16,949
Securities available for sale 20,137 20,499
FHLB stock 0 0
Loans held for sale 0 0
Loans 0 0
FDIC loss-sharing asset 0 0
Interest rate contracts 0 0
Liabilities    
Deposits 6,979,924 6,416,017
FHLB Advances 0 0
Repurchase agreements 0 0
Other borrowings   0
Interest rate contracts 0 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Assets    
Cash and due from banks 0 0
Interest-earning deposits with banks 0 0
Securities available for sale 2,137,557 2,077,758
FHLB stock 12,722 33,365
Loans held for sale 4,509 1,116
Loans 0 0
FDIC loss-sharing asset 0 0
Interest rate contracts 12,438 11,800
Liabilities    
Deposits 454,863 505,787
FHLB Advances 69,176 217,296
Repurchase agreements 100,346 106,171
Other borrowings   8,248
Interest rate contracts 12,478 11,851
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Assets    
Cash and due from banks 0 0
Interest-earning deposits with banks 0 0
Securities available for sale 0 0
FHLB stock 0 0
Loans held for sale 0 0
Loans 5,752,423 5,516,286
FDIC loss-sharing asset 921 4,054
Interest rate contracts 0 0
Liabilities    
Deposits 0 0
FHLB Advances 0 0
Repurchase agreements 0 0
Other borrowings   0
Interest rate contracts $ 0 $ 0
v3.3.1.900
Fair Value Accounting and Measurement Fair Value, quantitative inputs to Level 3 measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Impaired loans $ 758  
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Impaired loans 758  
Other Real Estate Owned, Fair Value Disclosure 4,524 $ 5,365
Other Collateral [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Impaired loans 378  
Real Estate Collateral [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Impaired loans $ 380  
v3.3.1.900
Earnings Per Common Share (Schedule of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Basic earnings allocated to common shareholders                 $ 97,577 $ 80,637 $ 59,398
Net income $ 26,740 $ 25,780 $ 21,946 $ 24,361 $ 18,920 $ 21,583 $ 21,227 $ 19,844 98,827 81,574 60,016
Earnings allocated to participating securities - preferred shares                 175 157 95
Earnings allocated to participating securities - nonvested restricted shares                 $ 1,075 $ 780 $ 523
Weighted average common shares outstanding                 57,019 52,618 47,993
Basic earnings per common share $ 0.46 $ 0.45 $ 0.38 $ 0.42 $ 0.34 $ 0.41 $ 0.40 $ 0.38 $ 1.71 $ 1.53 $ 1.24
Earnings allocated to common shareholders, Diluted                 $ 97,577 $ 80,640 $ 59,407
Weighted average number of common shares outstanding                 57,019 52,618 47,993
Dilutive effect of equity awards and warrants                 13 565 1,058
Weighted average diluted common shares outstanding                 57,032 53,183 49,051
Diluted earnings per common share $ 0.46 $ 0.45 $ 0.38 $ 0.42 $ 0.34 $ 0.41 $ 0.40 $ 0.37 $ 1.71 $ 1.52 $ 1.21
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.                 37 64 64
v3.3.1.900
Share-Based Payments (Share Awards) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Allocated Share-based Compensation Expense $ 4.1 $ 2.9 $ 2.8  
Share-based compensation, number authorized (in shares) 1,800,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 665,702 519,785 410,598 384,090
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 25.80 $ 23.03 $ 20.79 $ 19.54
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 306,007 246,068 203,441  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 28.57 $ 25.97 $ 20.78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (131,775) (108,371) (117,153)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 21.55 $ 21.45 $ 16.90  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (28,315) (28,510) (59,780)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 24.79 $ 21.92 $ 20.24  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 9.6      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 3 months 29 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 2.8 $ 2.3 $ 2.5  
v3.3.1.900
Share-Based Payments (Share Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 4,100 $ 2,900 $ 2,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Balance at beginning of year (in shares) 75,998    
Granted (in shares) 0 0 222,110
Forfeited (in shares) (6,387)    
Expired (in shares) (17,027)    
Exercised (in shares) (7,898)    
Balance at end of year (in shares) 44,686 75,998  
Total Exercisable Shares 44,686    
Weighted Average Exercise Price at beginning of year $ 62.41    
Weighted Average Exercise Price, Forfeited 79.60    
Weighted Average Exercise Price, Expired 88.76    
Weighted Average Exercise Price, Exercised 20.82    
Weighted Average Exercise Price at end of year 57.26 $ 62.41  
Exercisable, Weighted Average Exercise Price $ 57.26    
Weighted Average Remaining Contractual Term 2 years 1 month 25 days    
Aggregate Intrinsic Value $ 403    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 44,686    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 57.26    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 2 years 1 month 25 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 403    
Exercisable, Weighted Average Remaining Contractual Term 2 years 1 month 25 days    
Exercisable, Aggregate Intrinsic Value $ 403    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 85 $ 138 $ 410
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Number of Option Shares 44,686    
Weighted Average Remaining Contractual Life 2 years 1 month 25 days    
Weighted Average Exercise Price of Option Shares $ 57.26    
Number of Exercisable Option Shares 44,686    
Weighted Average Exercise Price of Exercisable Option Shares $ 57.26    
Stock-based compensation expense $ 4,090 $ 2,859 $ 2,844
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.06
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 0    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 0.00 To 9.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 0.00    
Range of Exercise Prices, Upper Limit $ 9.99    
Number of Option Shares 17,635    
Weighted Average Remaining Contractual Life 3 years 3 months 26 days    
Weighted Average Exercise Price of Option Shares $ 9.91    
Number of Exercisable Option Shares 17,635    
Weighted Average Exercise Price of Exercisable Option Shares $ 9.91    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 10.00 To 19.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit 10.00    
Range of Exercise Prices, Upper Limit $ 19.99    
Number of Option Shares 221    
Weighted Average Remaining Contractual Life 4 years 5 months 29 days    
Weighted Average Exercise Price of Option Shares $ 11.29    
Number of Exercisable Option Shares 221    
Weighted Average Exercise Price of Exercisable Option Shares $ 11.29    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 20.00 To 29.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit 20.00    
Range of Exercise Prices, Upper Limit 29.99    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 30.00 To 39.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit 30.00    
Range of Exercise Prices, Upper Limit 39.99    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 40.00 To 49.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit 40.00    
Range of Exercise Prices, Upper Limit $ 49.99    
Number of Option Shares 349    
Weighted Average Remaining Contractual Life 2 years 5 months 27 days    
Weighted Average Exercise Price of Option Shares $ 44.49    
Number of Exercisable Option Shares 349    
Weighted Average Exercise Price of Exercisable Option Shares $ 44.49    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 50.00 To 136.93 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit 50.00    
Range of Exercise Prices, Upper Limit $ 146.41    
Number of Option Shares 26,481    
Weighted Average Remaining Contractual Life 1 year 4 months 7 days    
Weighted Average Exercise Price of Option Shares $ 89.34    
Number of Exercisable Option Shares 26,481    
Weighted Average Exercise Price of Exercisable Option Shares $ 89.34    
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award, Exercisable Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Term 10 years    
v3.3.1.900
Income Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]                      
Federal operating loss carryforwards, set to begin to expire in 2024 $ 23,600               $ 23,600    
Idaho state operating loss carryforwards, set to begin to expire in 2024 32,700               32,700    
Interest and penalties on unrecognized tax benefits                 0    
State operating loss carryforwards, set to begin to expire in 2024 540               540    
Unrecognized tax position 0               0    
Federal tax credit carryforwards 569               569    
State tax credit carryforwards, set to expire in 2015 1,500               1,500    
Current tax (benefit) expense                 36,426 $ 21,565 $ 21,581
Deferred tax expense (benefit)                 6,367 14,646 5,413
Provision for income taxes 10,598 $ 11,515 $ 9,853 $ 10,827 $ 9,167 $ 9,605 $ 8,643 $ 8,796 42,793 36,211 26,994
Deferred tax assets:                      
Allowance for loan and lease losses 26,024       26,341       26,024 26,341  
Supplemental executive retirement plan 10,770       9,037       10,770 9,037  
Stock option and restricted stock 1,423       1,177       1,423 1,177  
OREO 813       1,101       813 1,101  
Nonaccrual interest 69       68       69 68  
Deferred tax assets, purchase accounting 9,457       15,272       9,457 15,272  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross 3,916       0       3,916 0  
Deferred Tax Assets, Operating Loss Carryforwards 11,467       14,929       11,467 14,929  
Other 180       532       180 532  
Total deferred tax assets 64,119       68,457       64,119 68,457  
Deferred tax liabilities:                      
Asset purchase tax basis difference (9,058)       (6,595)       (9,058) (6,595)  
FHLB stock dividends (1,232)       (4,086)       (1,232) (4,086)  
Deferred loan fees (5,202)       (4,691)       (5,202) (4,691)  
deferred tax liabilities, unrealized gains on available-for-sale securities 0       2,987       0 2,987  
Depreciation (3,730)       (5,394)       (3,730) (5,394)  
Total deferred tax liabilities 19,222       23,753       19,222 23,753  
Net deferred tax (liability) asset 44,897       44,704       44,897 44,704  
Reconciliation of effective income tax rate with federal statutory tax rate                      
Income tax based on statutory rate                 $ 49,567 $ 41,225 $ 30,454
Income tax based on statutory rate, percent                 35.00% 35.00% 35.00%
Tax exempt instrument                 $ (6,761) $ (5,328) $ (4,113)
Tax exempt instrument, percent                 (5.00%) (5.00%) (5.00%)
Life insurance proceeds                 $ (1,554) $ (1,352) $ (1,250)
Life insurance proceeds, percent                 (1.00%) (1.00%) (1.00%)
effective income tax rate reconciliation, nondeductible expense, business combination, amount                 $ 0 $ 448 $ 1,362
effective income tax rate reconciliation, nondeductible expense, business combination, percent                 0.00% 0.00% 2.00%
Other, net                 $ 1,541 $ 1,218 $ 541
Other, net, percent                 1.00% 2.00% 0.00%
Provision for income taxes $ 10,598 $ 11,515 $ 9,853 $ 10,827 $ 9,167 $ 9,605 $ 8,643 $ 8,796 $ 42,793 $ 36,211 $ 26,994
Income tax provision (benefit), percent                 30.00% 31.00% 31.00%
v3.3.1.900
Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital $ 852,731  
Common Equity Tier 1 Capital to Risk Weighted Assets 11.94%  
Common Equity Tier One Risk Based Capital Required for Capital Adequacy $ 321,370  
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Total Capital, Actual Amount $ 924,284 $ 890,029
Total Capital (to risk-weighted assets), Ratio 12.94% 14.13%
Total Capital For Capital Adequacy Purposes, Amount $ 571,324 $ 503,989
Total Capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Tier 1 Capital, Actual Amount $ 853,182 $ 817,805
Tier 1 Capital (to risk-weighted assets), Ratio 11.95% 12.98%
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 428,493 $ 251,995
Tier 1 Capital (to risk-weighted assets) For Capital Adequacy Purposes, Ratio 6.00% 4.00%
Tier 1 Capital, Actual Amount $ 853,182 $ 817,805
Tier 1 Capital (to average assets), Ratio 10.03% 10.57%
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 340,420 $ 309,579
Tier 1 Capital (to average assets) For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Banking Subsidiaries [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital $ 839,127  
Common Equity Tier 1 Capital to Risk Weighted Assets 11.76%  
Common Equity Tier One Risk Based Capital Required for Capital Adequacy $ 321,168  
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Common Equity Tier One Risk Based Capital Required to be Well Capitalized $ 463,909  
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.50%  
Total Capital, Actual Amount $ 910,229 $ 860,755
Total Capital (to risk-weighted assets), Ratio 12.75% 13.67%
Total Capital For Capital Adequacy Purposes, Amount $ 570,965 $ 503,852
Total Capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Total Capital To Be Well Capitalized Under Prompt Corrective Action Provision, Amount $ 713,706 $ 629,816
Total Capital (to risk-weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provision 10.00% 10.00%
Tier 1 Capital, Actual Amount $ 839,127 $ 788,531
Tier 1 Capital (to risk-weighted assets), Ratio 11.76% 12.52%
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 428,223 $ 251,926
Tier 1 Capital (to risk-weighted assets) For Capital Adequacy Purposes, Ratio 6.00% 4.00%
Tier 1 Capital To Be Well Capitalized Under Prompt Corrective Action Provision, Amount $ 570,965 $ 377,889
Tier 1 Capital (to risk-weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provision, Ratio 8.00% 6.00%
Tier 1 Capital, Actual Amount $ 839,127 $ 788,531
Tier 1 Capital (to average assets), Ratio 9.89% 9.79%
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 339,405 $ 322,029
Tier 1 Capital (to average assets) For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Tier 1 Capital To Be Well Capitalized Under Prompt Corrective Provision, Amount $ 424,256 $ 402,537
Tier 1 Capital (to average assets) To Be Well Capitalized Under Prompt Corrective Provision, Ratio 5.00% 5.00%
v3.3.1.900
Branch Sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 23, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deposit Premium Percentage 2.35%      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ 0 $ 565 $ 0
Disposal Date Aug. 23, 2014      
Deposits [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal group, branch sale, Deposits transferred $ 22,200      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 565      
Loans Receivable [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal group, branch sale, loans transferred 1,100      
Property, Plant and Equipment [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal group, branch sale, premises and equipment transferred 3,800      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 50      
v3.3.1.900
Parent Company Financial Information (Condensed Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets        
Cash and due from banks $ 166,929 $ 171,221    
Interest-earning deposits 8,373 16,949    
Total cash and cash equivalents 175,302 188,170 $ 179,561 $ 513,926
Other assets 235,854 231,877    
Total Assets 8,951,697 8,578,846    
Liabilities and Shareholders’ Equity        
Other borrowings 0 8,248    
Other liabilities 102,510 96,053    
Total liabilities 7,709,569 7,350,671    
Shareholders’ equity 1,242,128 1,228,175 1,053,249 764,008
Total liabilities and shareholders' equity 8,951,697 8,578,846    
Parent Company [Member]        
Assets        
Cash and due from banks 3,429 10,322    
Interest-earning deposits 560 12,274    
Total cash and cash equivalents 3,989 22,596 $ 53,684 $ 86,644
Other assets 4,833 5,273    
Total Assets 1,242,459 1,240,363    
Liabilities and Shareholders’ Equity        
Other borrowings 0 8,248    
Other liabilities 331 3,940    
Total liabilities 331 12,188    
Shareholders’ equity 1,242,128 1,228,175    
Total liabilities and shareholders' equity 1,242,459 1,240,363    
Banking Subsidiaries [Member] | Parent Company [Member]        
Assets        
Investment in subsidiaries 1,228,070 1,207,143    
Other Subsidiaries [Member] | Parent Company [Member]        
Assets        
Investment in subsidiaries $ 5,567 $ 5,351    
v3.3.1.900
Parent Company Financial Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income                      
Interest-earning deposits                 $ 109 $ 179 $ 355
Expense                      
Compensation and employee benefits                 149,410 130,864 125,432
Other borrowings                 553 593 734
Other expense                 30,521 27,045 29,962
Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries $ 37,338 $ 37,295 $ 31,799 $ 35,188 $ 28,087 $ 31,188 $ 29,870 $ 28,640 141,620 117,785 87,010
Provision for income taxes 10,598 11,515 9,853 10,827 9,167 9,605 8,643 8,796 42,793 36,211 26,994
Net income $ 26,740 $ 25,780 $ 21,946 $ 24,361 $ 18,920 $ 21,583 $ 21,227 $ 19,844 98,827 81,574 60,016
Parent Company [Member]                      
Income                      
Dividend from banking subsidiaries                 67,000 16,200 183,000
Interest-earning deposits                 5 25 68
Other income                 92 10 7
Total Income                 67,097 16,235 183,075
Expense                      
Compensation and employee benefits                 618 530 658
Other borrowings                 5 83 258
Other expense                 1,368 1,433 4,162
Total Expenses                 1,991 2,046 5,078
Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries                 65,106 14,189 177,997
Provision for income taxes                 (663) (704) (1,552)
Income before equity in undistributed (excess distributed) earnings of subsidiaries                 65,769 14,893 179,549
Equity in undistributed (excess distributed) earnings of subsidiaries                 33,058 66,681 (119,533)
Net income                 $ 98,827 $ 81,574 $ 60,016
v3.3.1.900
Parent Company Financial Information (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities                      
Net Income (Loss) $ 26,740 $ 25,780 $ 21,946 $ 24,361 $ 18,920 $ 21,583 $ 21,227 $ 19,844 $ 98,827 $ 81,574 $ 60,016
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 4,090 2,859 2,844
Net cash provided by operating activities                 134,756 137,618 79,636
Net cash received (paid) in business combinations                 0 32,255 (154,170)
Investing Activities                      
Net cash provided by investing activities                 (423,054) (521,961) (281,060)
Financing Activities                      
Payments of Ordinary Dividends, Preferred Stock and Preference Stock                 (137) (96) (32)
Cash dividends paid                 (77,263) (49,494) (19,858)
Proceeds from Warrant Exercises                 0 5,000 0
Purchase and retirement of common stock                 (906) (622) (429)
Proceeds from exercise of stock options                 1,258 929 1,092
Excess tax benefit from stock-based compensation                 0 205 1,203
Net cash provided by financing activities                 275,430 392,952 (132,941)
Increase (decrease) in cash and cash equivalents                 (12,868) 8,609 (334,365)
Cash and cash equivalents at beginning of period       188,170       179,561 188,170 179,561 513,926
Cash and cash equivalents at end of period 175,302       188,170       175,302 188,170 179,561
Parent Company [Member]                      
Operating Activities                      
Net Income (Loss)                 98,827 81,574 60,016
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in (undistributed) excess distributed earnings of subsidiaries                 (33,058) (66,681) 119,533
Stock-based compensation expense                 4,090 2,859 2,844
Net changes in other assets and liabilities                 (3,170) (403) 6,830
Net cash provided by operating activities                 66,689 17,349 189,223
Net cash received (paid) in business combinations                 0 10,277 (53,159)
Investing Activities                      
Net cash provided by investing activities                 0 10,277 (53,159)
Financing Activities                      
Payments of Ordinary Dividends, Preferred Stock and Preference Stock                 (137) (96) (32)
Cash dividends paid                 (77,263) (49,494) (19,858)
Repayment of long-term subordinated debt                 (8,248) (14,636) (51,000)
Proceeds from Warrant Exercises                 0 5,000 0
Purchase and retirement of common stock                 (906) (622) (429)
Proceeds from exercise of stock options                 1,258 929 1,092
Downstream stock offering proceeds to the Bank                 0 0 (100,000)
Excess tax benefit from stock-based compensation                 0 205 1,203
Net cash provided by financing activities                 (85,296) (58,714) (169,024)
Increase (decrease) in cash and cash equivalents                 (18,607) (31,088) (32,960)
Cash and cash equivalents at beginning of period       $ 22,596       $ 53,684 22,596 53,684 86,644
Cash and cash equivalents at end of period $ 3,989       $ 22,596       $ 3,989 $ 22,596 $ 53,684
v3.3.1.900
Summary Of Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 82,769 $ 82,665 $ 82,040 $ 81,417 $ 79,897 $ 77,133 $ 76,087 $ 74,925 $ 328,891 $ 308,042 $ 296,935
Total interest expense 950 971 1,030 1,053 1,133 913 963 985 4,004 3,994 5,840
Net Interest Income 81,819 81,694 81,010 80,364 78,764 76,220 75,124 73,940 324,887 304,048 291,095
Provision (recapture) for loan and lease losses 2,349 2,831 2,202 1,209 1,708 980 2,117 1,922 8,591 6,727 (101)
Noninterest income 24,745 22,499 21,462 22,767 15,185 15,930 14,627 14,008 91,473 59,750 26,700
Noninterest expense 66,877 64,067 68,471 66,734 64,154 59,982 57,764 57,386 266,149 239,286 230,886
Income before income taxes 37,338 37,295 31,799 35,188 28,087 31,188 29,870 28,640 141,620 117,785 87,010
Provision for income taxes 10,598 11,515 9,853 10,827 9,167 9,605 8,643 8,796 42,793 36,211 26,994
Net income $ 26,740 $ 25,780 $ 21,946 $ 24,361 $ 18,920 $ 21,583 $ 21,227 $ 19,844 $ 98,827 $ 81,574 $ 60,016
Per Common Share                      
Earnings (basic) $ 0.46 $ 0.45 $ 0.38 $ 0.42 $ 0.34 $ 0.41 $ 0.40 $ 0.38 $ 1.71 $ 1.53 $ 1.24
Earnings (diluted) $ 0.46 $ 0.45 $ 0.38 $ 0.42 $ 0.34 $ 0.41 $ 0.40 $ 0.37 $ 1.71 $ 1.52 $ 1.21