Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 30, 2018
Document and Entity Information
Entity Registrant Name	EAST WEST BANCORP INC
Entity Central Index Key	0001069157
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		144,898,007

Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 413,017	$ 457,181
Interest-bearing cash with banks	1,901,921	1,717,411
Cash and cash equivalents	2,314,938	2,174,592
Interest-bearing deposits with banks	478,871	398,422
Securities purchased under resale agreements (“resale agreements”)	1,050,000	1,050,000
Securities:
Available-for-sale investment securities, at fair value (includes assets pledged as collateral of $498,658 in 2018 and $534,327 in 2017)	2,811,416	3,016,752
Restricted equity securities, at cost	73,787	73,521
Loans held-for-sale	46,181	85
Loans held-for-investment (net of allowance for loan losses of $297,654 in 2018 and $287,128 in 2017; includes assets pledged as collateral of $19,495,480 in 2018 and $18,880,598 in 2017)	29,257,594	28,688,590
Investments in qualified affordable housing partnerships, net	160,574	162,824
Investments in tax credit and other investments, net	246,183	224,551
Premises and equipment (net of accumulated depreciation of $109,126 in 2018 and $111,898 in 2017)	119,733	121,209
Goodwill	465,547	469,433
Branch assets held-for-sale	0	91,318
Other assets	668,334	678,952
TOTAL	37,693,158	37,150,249
LIABILITIES
Noninterest-bearing	11,763,936	10,887,306
Interest-bearing	20,844,841	20,727,757
Total deposits	32,608,777	31,615,063
Branch liability held-for-sale	0	605,111
Short-term borrowings	30,277	0
Federal Home Loan Bank (“FHLB”) advances	324,451	323,891
Securities sold under repurchase agreements (“repurchase agreements”)	50,000	50,000
Long-term debt	166,640	171,577
Accrued expenses and other liabilities	534,258	542,656
Total liabilities	33,714,403	33,308,298
COMMITMENTS AND CONTINGENCIES (Note 11)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 165,544,235 and 165,214,770 shares issued in 2018 and 2017, respectively	166	165
Additional paid-in capital	1,746,541	1,755,330
Retained earnings	2,740,179	2,576,302
Treasury stock, at cost — 20,671,710 shares as of both 2018 and 2017	(452,327)	(452,327)
Accumulated other comprehensive loss (“AOCI”), net of tax	(55,804)	(37,519)
Total stockholders’ equity	3,978,755	3,841,951
TOTAL	$ 37,693,158	$ 37,150,249

Consolidated Statement of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 337,904	$ 272,061
Investment securities	15,456	15,247
Resale agreements	6,934	9,468
Restricted equity securities	634	777
Interest-bearing cash and deposits with banks	10,945	5,116
Total interest and dividend income	371,873	302,669
INTEREST EXPENSE
Deposits	39,136	23,672
Federal funds purchased and other short-term borrowings	7	413
FHLB advances	2,260	2,030
Repurchase agreements	2,306	3,143
Long-term debt	1,471	1,289
Total interest expense	45,180	30,547
Net interest income before provision for credit losses	326,693	272,122
Provision for credit losses	20,218	7,068
Net interest income after provision for credit losses	306,475	265,054
NONINTEREST INCOME
Branch fees	10,430	9,924
Letters of credit fees and foreign exchange income	9,602	11,441
Ancillary loan fees and other income	5,581	4,982
Wealth management fees	2,953	4,335
Derivative fees and other income	6,690	2,506
Net gains on sales of loans	1,582	2,754
Net gains on sales of available-for-sale investment securities	2,129	2,474
Net gains on sales of fixed assets	1,086	72,007
Net gain on sale of business	31,470	0
Other fees and operating income	2,921	5,405
Total noninterest income	74,444	115,828
NONINTEREST EXPENSE
Compensation and employee benefits	95,234	84,603
Occupancy and equipment expense	16,880	15,640
Deposit insurance premiums and regulatory assessments	6,273	5,929
Legal expense	2,255	3,062
Data processing	3,401	2,947
Consulting expense	2,352	1,919
Deposit related expense	2,679	2,365
Computer software expense	5,054	3,968
Other operating expense	17,607	18,085
Amortization of tax credit and other investments	17,400	14,360
Total noninterest expense	169,135	152,878
INCOME BEFORE INCOME TAXES	211,784	228,004
INCOME TAX EXPENSE	24,752	58,268
NET INCOME	$ 187,032	$ 169,736
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 1.29	$ 1.18
DILUTED (in dollars per share)	$ 1.28	$ 1.16
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	144,664	144,249
DILUTED (in shares)	145,939	145,732
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.20	$ 0.20

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Available-for-sale securities pledged as collateral	$ 498,658	$ 534,327
Allowance for loan losses	297,654	287,128
Loans held-for-investment pledged as collateral	19,495,480	18,880,598
Premises and equipment, accumulated depreciation	$ 109,126	$ 111,898
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	165,544,235	165,214,770
Treasury stock, shares (in shares)	20,671,710	20,671,710

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 187,032	$ 169,736
Other comprehensive (loss) income, net of tax:
Net changes in unrealized (losses) gains on available-for-sale investment securities	(18,812)	3,621
Foreign currency translation adjustments	6,798	1,007
Other comprehensive (loss) income	(12,014)	4,628
COMPREHENSIVE INCOME	$ 175,018	$ 174,364

Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands

Total

Common Stock

Common Stock and Additional Paid-In Capital

Retained Earnings

Treasury Stock

AOCI, Net of Tax

Beginning balance (in shares) at Dec. 31, 2016

144,167,451

Beginning balance at Dec. 31, 2016

$ 3,427,741

$ 1,727,598

$ 2,187,676

$ (439,387)

$ (48,146)

Increase (Decrease) in Stockholders' Equity

Net income

169,736

Other comprehensive income (loss)

4,628

Stock compensation costs

5,151

Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)

294,115

Net activity of common stock pursuant to various stock compensation plans and agreements

(12,154)

0

Net activity of common stock pursuant to various stock compensation plans and agreements

(12,154)

Cash dividends on common stock

(29,148)

Ending balance (in shares) at Mar. 31, 2017

144,461,566

Ending balance at Mar. 31, 2017

3,565,954

1,732,749

2,328,264

(451,541)

(43,518)

Increase (Decrease) in Stockholders' Equity

Cumulative effect of change in accounting principle related to marketable equity securities

^[1]

(160)

(545)

385

Beginning balance (in shares) at Dec. 31, 2017

144,543,060

Beginning balance at Dec. 31, 2017

3,841,951

1,755,495

2,576,302

(452,327)

(37,519)

Increase (Decrease) in Stockholders' Equity

Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate

^[2]

6,656

(6,656)

Net income

187,032

Other comprehensive income (loss)

(12,014)

Stock compensation costs

6,158

Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)

329,465

Net activity of common stock pursuant to various stock compensation plans and agreements

(14,946)

Net activity of common stock pursuant to various stock compensation plans and agreements

0

Cash dividends on common stock

(29,266)

Ending balance (in shares) at Mar. 31, 2018

144,872,525

Ending balance at Mar. 31, 2018

$ 3,978,755

$ 1,746,707

$ 2,740,179

$ (452,327)

$ (55,804)

[1]

Represents the impact of the adoption in the first quarter of 2018 of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

[2]

Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income during the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 187,032	$ 169,736
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,858	33,061
Accretion of discount and amortization of premiums, net	(2,680)	(4,931)
Stock compensation costs	6,158	5,151
Deferred income tax expense	677	2,295
Provision for credit losses	20,218	7,068
Net gains on sales of loans	(1,582)	(2,754)
Net gains on sales of available-for-sale investment securities	(2,129)	(2,474)
Net gains on sales of premises and equipment	(1,086)	(72,007)
Net gain on sale of business	(31,470)	0
Originations and purchases of loans held-for-sale	(4,617)	(4,287)
Proceeds from sales and paydowns/payoffs in loans held-for-sale	2,545	4,773
Proceeds from distributions received from equity method investees	887	8
Net change in accrued interest receivable and other assets	14,465	93,647
Net change in accrued expenses and other liabilities	(570)	(37,791)
Other net operating activities	148	(5,220)
Total adjustments	30,822	16,539
Net cash provided by operating activities	217,854	186,275
Net (increase) decrease in:
Loans held-for-investment	(619,671)	(1,085,449)
Interest-bearing deposits with banks	(71,203)	75,140
Investments in qualified affordable housing partnerships, tax credit and other investments	(22,799)	(39,531)
Payment for sale of business, net of cash transferred	(503,687)	0
Purchases of:
Resale agreements	0	(200,000)
Available-for-sale investment securities	(157,933)	(50,936)
Loans held-for-investment	(80,077)	(147,242)
Premises and equipment	(1,757)	(1,191)
Proceeds from sale of:
Available-for-sale investment securities	214,790	302,656
Loans held-for-investment	112,964	276,643
Other real estate owned (“OREO”)	2,716	3,958
Premises and equipment	0	116,021
Paydowns and maturities of resale agreements	0	400,000
Proceeds from distributions received from equity method investees	629	1,169
Repayments, maturities and redemptions of available-for-sale investment securities	87,677	125,006
Other net investing activities	(1,967)	10,355
Net cash used in investing activities	(1,040,318)	(213,401)
Net increase (decrease) in:
Deposits	964,380	646,188
Short-term borrowings	30,215	(18,524)
Payments for:
Repayment of long-term debt	(5,000)	(5,000)
Repurchase of vested shares due to employee tax liability	(14,946)	(12,154)
Cash dividends on common stock	(30,235)	(30,039)
Net cash provided by financing activities	944,414	580,471
Effect of exchange rate changes on cash and cash equivalents	18,396	2,795
NET INCREASE IN CASH AND CASH EQUIVALENTS	140,346	556,140
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,174,592	1,878,503
CASH AND CASH EQUIVALENTS, END OF PERIOD	2,314,938	2,434,643
Cash paid (received) during the period for:
Interest paid	43,218	30,361
Income taxes paid (refunded), net	10,084	(230)
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	$ 155,767	$ 278,024

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank and East West’s various subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of March 31, 2018, East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, the Trusts are not included on the Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements presented in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry, reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim period Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation. The current period’s results of operations are not necessarily indicative of results that may be expected for any other interim period or for the year as a whole. Events subsequent to the Consolidated Balance Sheet date have been evaluated through the date the Consolidated Financial Statements are issued for inclusion in the accompanying Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto, included in the Company’s annual report on Form 10-K for the year ended December 31, 2017 filed with the U.S. Securities and Exchange Commission on February 27, 2018 (the “Company’s 2017 Form 10-K”).

Current Accounting Developments	3 Months Ended
Current Accounting Developments	Mar. 31, 2018
Accounting Policies [Abstract]
Current Accounting Developments	Current Accounting Developments New Accounting Pronouncements Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which clarifies the principles for recognizing revenue for contracts to provide goods or services to customers. ASU 2014-09 also requires new quantitative and qualitative disclosures including the disaggregation of revenues and descriptions of performance obligations. The Company’s revenue is comprised of net interest income and noninterest income. The scope of this new guidance explicitly excludes net interest income, as well as other revenues from financial instruments including loans, leases, securities and derivatives. Accordingly, the majority of the Company’s revenues will not be affected. In addition, the new standard does not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s existing accounting for contracts within the scope of the new standard. The Company adopted this guidance as of January 1, 2018 using the modified retrospective method where there was no cumulative effect adjustment to retained earnings as a result of adopting this new standard. In addition, the standard did not have a material impact on our consolidated financial statements. The Company has provided a disaggregation of the significant categories of revenues within the scope of this guidance and expanded the qualitative disclosures of the Company’s noninterest income. See Note 12 — Revenue from Contracts with Customers for additional information. In January 2016, the FASB issued ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. With the exception of the amendments related to equity investments without readily determinable fair values and the use of exit price to measure the fair value of financial instruments for disclosure purposes that will be adopted prospectively, the Company adopted all the other amendments of the standard effective January 1, 2018 on a modified retrospective basis. ASU 2016-01 requires investments in marketable equity securities to be accounted for at fair value with unrealized gains or losses reflected in earnings. As of the date of adoption, the Company reclassified approximately $31.9 million of marketable equity securities that were previously classified as Available-for-sale investment securities, at fair value to Investment in tax credits and other investments, net. In addition, the Company recorded a cumulative-effect adjustment as of January 1, 2018 that reduced retained earnings by $545 thousand and increased AOCI by $385 thousand. The guidance also provides a measurement alternative for equity securities without readily determinable fair values to be measured at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer. Such price changes (if any) are reflected in earnings beginning in the period of adoption. The Company elected the measurement alternative for its privately held cost method investments of $11.4 million. No cumulative-effect adjustment to retained earnings was recorded related to the adoption of this guidance. The Company’s investments in the Federal Reserve Bank of San Francisco (“FRB”) and FHLB stock are not subject to this guidance and continue to be accounted for at cost. In addition, ASU 2016-01 eliminated the requirement to disclose methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost on the Consolidated Balance Sheet. Furthermore, for purposes of disclosing the fair value of financial instruments carried at amortized cost, the Company has updated its valuation methods as necessary to conform to an exit price concept as required by ASU 2016-01. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, to provide guidance on eight specific issues related to classification on the Consolidated Statement of Cash Flows. The specific issues cover cash payments for debt prepayment or debt extinguishment costs; cash outflows for settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments that are not made soon after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; and beneficial interests received in securitization transactions. The guidance also clarifies that in instances of cash flows with multiple aspects that cannot be separately identified, the classification should be based on the activity that is likely to be the predominant source or use of the cash flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the Company to include those amounts that are deemed to be restricted cash and restricted cash equivalents in its cash and cash equivalents balances on the Consolidated Statement of Cash Flows. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Consolidated Statement of Cash Flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 narrows the definition of a business by adding an initial screen to determine if substantially all of the fair value of the gross assets acquired is concentrated in a single asset or group of similar assets. If the screen is met, the set is not a business. ASU 2017-01 also specifies the minimum required inputs and processes necessary to be a business, and it removes the requirement to evaluate a market participant’s ability to replace missing elements when all of the inputs or processes that the seller used in operating a business were not obtained. ASU 2017-01 became effective on January 1, 2018. The Company adopted this guidance in the first quarter of 2018. This guidance is to be applied prospectively and did not have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU 2017-08, Receivables — Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities, which amends the amortization period for certain purchased callable debt securities held at a premium, shortening such period to the earliest call date. The guidance does not require any accounting changes for debt securities held at a discount; the discount continues to be amortized as an adjustment of yield over the contractual life (to maturity) of the instrument. ASU 2017-08 is effective on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method, with the cumulative-effect adjustment recognized to retained earnings as of the beginning of the period of adoption. The Company has elected to early adopt this guidance in the first quarter of 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In May 2017, the FASB issued ASU 2017-09, Compensation — Stock Compensation (Topic 718): Scope of Modification Accounting, which amends the scope of modification accounting for share-based payment arrangements. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification. ASU 2017-09 was effective on January 1, 2018, with early adoption permitted. The Company adopted the guidance in the first quarter of 2018 prospectively. The adoption did not have an impact on the Company’s Consolidated Financial Statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This guidance better aligns the Company’s risk management activities and financial reporting for hedging relationships through changes to both the description and measurement guidance for qualifying hedging relationships. The guidance also changes the presentation of hedge results, expands and refines hedge accounting for both nonfinancial and financial risk components, and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item on the Consolidated Financial Statements. ASU 2017-12 is effective on January 1, 2019 by modified retrospective method, with early adoption permitted. The Company has elected to early adopt this guidance in the first quarter of 2018, and the adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In February 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Under current U.S. GAAP, deferred tax assets and liabilities are to be adjusted for the effect of a change in tax laws or rates included in net income of the reporting period that includes the enactment date. This accounting treatment resulted in the tax effect of items within AOCI not reflecting the appropriate tax rate. This guidance permits companies to reclassify the stranded tax effects resulting from the Tax Act from AOCI to retained earnings. The guidance is effective on January 1, 2019 with early adoption permitted. The Company has elected to early adopt this guidance in the first quarter of 2018 retrospectively. The Company has identified the unrealized losses for available-for-sale securities to be the only item in AOCI with stranded tax effects, and made a policy election to reclassify the related stranded tax effects using the “investment-by-investment” approach. The adoption of the guidance resulted in a cumulative-effect adjustment as of January 1, 2018 that increased retained earnings by $6.7 million and reduced AOCI by the same amount. Recent Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which is intended to increase transparency and comparability in the accounting for lease transactions. The guidance requires lessees to recognize right-of-use assets and related lease liabilities for all leases with lease terms of more than 12 months on the Consolidated Balance Sheet, and provide quantitative and qualitative disclosures regarding key information about the leasing arrangements. For short-term leases with a term of 12 months or less, lessees can make a policy election not to recognize lease assets and lease liabilities. Lessor accounting is largely unchanged. ASU 2016-02 is effective on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method through a cumulative-effect adjustment. The Company has completed its review of its existing lease contracts and service contracts that may include embedded leases and is in the process of implementing a new system to address this guidance. The Company expects the adoption of ASU 2016-02 to result in additional assets and liabilities, as the Company will be required to recognize operating leases on its Consolidated Balance Sheet. The Company does not expect a material impact to its recognition of operating lease expense on its Consolidated Statement of Income and is in the process of evaluating the impacts of adopting the new accounting guidance on its disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new current expected credit loss (“CECL”) impairment model applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loan receivables, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). ASU 2016-13 is effective on January 1, 2020, with early adoption permitted on January 1, 2019. The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. While the Company is still evaluating the impact on its Consolidated Financial Statements, the Company expects that ASU 2016-13 may result in an increase in the allowance for credit losses due to the following factors: 1) the allowance for credit losses provides for expected credit losses over the remaining expected life of the loan portfolio, and will consider expected future changes in macroeconomic conditions; 2) the nonaccretable difference on the purchased credit impaired (“PCI”) loans will be recognized as an allowance, offset by an increase in the carrying value of the PCI loans; and 3) an allowance may be established for estimated credit losses on available-for-sale debt securities. The Company has begun its implementation efforts by identifying key interpretive issues, assessing its processes and identifying the system requirements against the new guidance to determine what modifications may be required. The implementation efforts also involve, but are not limited to, assessing potential macroeconomic factors that will be used to determine the reasonable and supportable forecast period. In January 2017, the FASB issued ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, to simplify the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. ASU 2017-04 is effective on January 1, 2020 and should be applied prospectively. Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The Company does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements.

Dispositions and Held-for-Sale	3 Months Ended
Dispositions and Held-for-Sale	Mar. 31, 2018
Dispositions And Held-For-Sale Classification [Abstract]
Dispositions and Held-for-Sale	Dispositions and Held-for-Sale In the first quarter of 2017, the Company completed the sale and leaseback of a commercial property in San Francisco, California for cash consideration of $120.6 million, and entered into a leaseback with the buyer for part of the property, consisting of a retail branch and office facilities. The net book value of the property was $31.6 million at the time of the sale, resulting in a pre-tax gain of $85.4 million after considering $3.6 million in selling costs. As the leaseback is an operating lease, $71.7 million of the gain was recognized on the closing date, and $13.7 million was deferred and will be recognized over the term of the lease agreement. The Company reports a business as held-for-sale when management has approved or received approval to sell the business and is committed to a formal plan, the business is available for immediate sale, the business is being actively marketed, the sale is anticipated to occur during the next 12 months and certain other specific criteria are met. A business classified as held-for-sale is recorded at the lower of its carrying amount or estimated fair value less costs to sell. If the carrying amount of the business exceeds its estimated fair value, a loss is recognized. Depreciation and amortization expense are not recorded with respect to the assets of a business after it is classified as held-for-sale. On November 11, 2017, the Bank entered into a Purchase and Assumption Agreement to sell all of its eight Desert Community Bank (“DCB”) branches located in the High Desert area of Southern California, and related assets and liabilities to Flagstar Bank, a wholly-owned subsidiary of Flagstar Bancorp, Inc. The Company determined that this transaction met the criteria for held-for-sale as of December 31, 2017. Branch assets held-for-sale as of December 31, 2017 were largely comprised of $78.1 million in loans held-for-sale and $8.0 million in premises and equipment, net. Branch liability held-for-sale as of December 31, 2017 was comprised of $605.1 million in deposits. The sale of the Bank’s eight DCB branches was completed on March 17, 2018. The assets and liabilities of the DCB branches that were sold in this transaction included primarily $613.7 million of deposits, $59.1 million of loans, $9.0 million of cash and cash equivalents and $7.9 million of premises and equipment. The transaction resulted in a net cash payment of $499.9 million by the Company to Flagstar Bank. After transaction costs, the sale resulted in a pre-tax gain of $31.5 million in the three months ended March 31, 2018, which was reported as Net gain on sale of business on the Consolidated Statement of Income.

Fair Value Measurement and Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement and Fair Value of Financial Instruments

Fair Value Determination

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing an asset or a liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories:



•	Level 1	—	Valuation is based on quoted prices for identical instruments traded in active markets.
•	Level 2	—	Valuation is based on quoted prices for similar instruments traded in active markets; quoted prices for identical or similar instruments traded in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data.
•	Level 3	—	Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities.

The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable, and the significance of those inputs in the fair valuation measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements.

Level 3 Assets and Liabilities Valuation Process

The Company generally determines the fair value of Level 3 assets and liabilities by using internal valuation methodologies, which primarily include discounted cash flows techniques that require both observable and unobservable inputs. Unobservable inputs (such as volatility and liquidity discount) are generally derived from historic performance of similar instruments or determined from previous market trades in similar instruments. Such inputs can be derived from similar portfolios with known historic experience or recent trades where particular unobservable inputs may be implied. The Company compares each unobservable input to historic experience and other third-party data where available. The models developed under internal valuation methodologies are subject to review according to the Company’s risk management policies and procedures, which include model validation. Model validation assesses the adequacy and appropriateness of the model, including reviewing its supporting model documentation and key components such as inputs, logic, processing components and output results. Validation also includes ensuring significant unobservable model inputs are appropriate given observable market transactions or other market data within the same or similar asset classes. The Company has ongoing monitoring procedures in place for Level 3 assets and liabilities that use internal valuation methodologies, which include but are not limited to, the following:


•	review of valuation results against expectations, including review of significant or unusual value fluctuations; and


•	quarterly analysis related to market data, where available.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following section describes the valuation methodologies used by the Company to measure financial assets and liabilities on a recurring basis, as well as the general classification of these instruments pursuant to the valuation hierarchy.

Available-for-Sale Investment Securities — When available, the Company uses quoted market prices to determine the fair value of available-for-sale investment securities, which are classified as Level 1. Level 1 available-for-sale investment securities are primarily comprised of U.S. Treasury securities. The fair value of other available-for-sale investment securities is generally determined by independent external pricing service providers who have experience in valuing these securities or by the average quoted market prices obtained from independent external brokers. In obtaining such valuation information from third parties, the Company reviewed the methodologies used to develop the resulting fair value. The available-for-sale investment securities valued using such methods are classified as Level 2.

Equity Securities — Equity securities were comprised of mutual funds as of both March 31, 2018 and December 31, 2017. The Company uses Net Asset Value (“NAV”) information to determine the fair value of these equity securities. When NAV is available periodically and the equity securities can be put back to the transfer agents at the publicly available NAV, the fair value of the equity securities is classified as Level 1. When NAV is available periodically but the equity securities may not be readily marketable at its periodic NAV in the secondary market, the fair value of these equity securities is classified as Level 2.

Interest Rate Swaps and Options — The Company enters into interest rate swap and option contracts with institutional counterparties to hedge against interest rate swap and option products offered to bank customers. These products allow borrowers to lock in attractive intermediate and long-term interest rates by entering into an interest rate swap or option contract with the Company, resulting in the customer obtaining a synthetic fixed rate loan. The Company also enters into interest rate swap contracts with institutional counterparties to hedge against certificates of deposit issued. This product allows the Company to lock in attractive floating rate funding. The fair value of the interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The fair value of the interest rate options, which consist of floors and caps, is determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (rise above) the strike rate of the floors (caps). In addition, to comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements of its derivatives. The credit valuation adjustments associated with the Company’s derivatives utilize Level 3 inputs, model-derived credit spreads. As of March 31, 2018, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of these interest rate contracts and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative portfolios. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized.

Foreign Exchange Spot and Forwards — The Company enters into short-term foreign exchange contracts to purchase/sell foreign currencies at set rates in the future. These contracts economically hedge against foreign exchange rate fluctuations. The Company also enters into contracts with institutional counterparties to hedge against foreign exchange products offered to bank customers. These products allow customers to hedge the foreign exchange rate risk of their deposits and loans denominated in foreign currencies. The Company assumes minimal foreign exchange rate risk because the contracts with the customer and the institutional party mirror each other. The fair value is determined at each reporting period based on changes in the foreign exchange rates. These are over-the-counter contracts where quoted market prices are not readily available. Valuation is measured using conventional valuation methodologies with observable market data. Due to the short-term nature of the majority of these contracts, the counterparties’ credit risks are considered nominal and result in no adjustments to the valuation of the foreign exchange contracts. Due to the observable nature of the inputs used in deriving the fair value of these contracts, the valuation of foreign exchange contracts are classified as Level 2. During the three months ended March 31, 2018, the Company entered into foreign currency forward contracts to hedge its net investment in its China subsidiary, East West Bank (China) Limited, a non-US Dollar (“USD”) functional currency subsidiary in China. These foreign currency forward contracts were designated as net investment hedges. As of December 31, 2017, foreign exchange forward contracts were used to economically hedge the Company’s net investment in East West Bank (China) Limited. The fair value of foreign currency forward contracts is valued by comparing the contracted foreign exchange rate to the current market foreign exchange rate. Key inputs of the current market exchange rate include forward rates and the interest rate curves of the domestic and foreign currency. Interest rate forward curves are used to determine which forward rate pertains to a specific maturity. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2.

Credit Risk Participation Agreements (“RPAs”) — The Company has entered into RPAs with institutional counterparties, under which the Company assumes its pro-rata share of the credit exposure associated with a borrower’s performance related to interest rate derivative contracts. The fair value of RPAs is calculated by determining the total expected asset or liability exposure of the derivatives to the borrowers and applying the borrowers’ credit spread to that exposure. Total expected exposure incorporates both the current and potential future exposure of the derivatives, derived from using observable inputs, such as yield curves and volatilities. Accordingly, RPAs fall within Level 2.

Equity warrants — The Company has obtained warrants to purchase preferred and common stock of technology and life sciences companies as part of the loan origination process. As of March 31, 2018 and December 31, 2017, the warrants included on the Consolidated Financial Statements were from public and private companies. The Company valued these warrants based on the Black-Scholes option pricing model. For warrants from public companies, the model uses the underlying stock price, stated strike price, warrant expiration date, risk-free interest rate based on a duration-matched U.S. Treasury rate and market-observable company-specific option volatility as inputs to value the warrants. Due to the observable nature of the inputs used in deriving the estimated fair value, warrants from public companies are classified as Level 2. For warrants from private companies, the model uses inputs such as the offering price observed in the most recent round of funding, stated strike price, warrant expiration date, risk-free interest rate based on duration-matched U.S. Treasury rate and option volatility. The model values are then adjusted for a general lack of liquidity due to the private nature of the underlying companies. Due to the unobservable nature of the option volatility and liquidity discount assumptions used in deriving the estimated fair value, warrants from private companies are classified as Level 3. For the private company warrants that are expected to be exercised under known merger and acquisition (“M&A”) events associated with the portfolio company, the estimated fair value has been further adjusted based on non-public information considering the most likely outcome from the M&A events, where applicable. On a quarterly basis, the changes in the fair value of warrants from private companies are reviewed for reasonableness, and a sensitivity analysis on the option volatility and liquidity discount assumptions is performed.

Commodity Options — The Company enters into energy commodity contracts in the form of options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. The fair value of the commodity contract is determined using the Black’s option pricing model utilizing expectation of future commodity price and volatility. The future commodity contract price is derived from observable inputs such as dealer quotes. The Company classifies these instruments as Level 2 due to the observable nature of the significant inputs utilized.

The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017:




($ in thousands)	Assets (Liabilities) Measured at Fair Value on a Recurring Basis as of March 31, 2018
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available-for-sale investment securities ⁽¹⁾:
U.S. Treasury securities	$	651,830	$	651,830	$	—	$	—
U.S. government agency and U.S. government sponsored enterprise debt securities	233,016		—		233,016		—
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	339,834		—		339,834		—
Residential mortgage-backed securities	989,453		—		989,453		—
Municipal securities	74,076		—		74,076		—
Non-agency residential mortgage-backed securities:
Investment grade	8,404		—		8,404		—
Corporate debt securities:
Investment grade	35,858		—		35,858		—
Foreign bonds:
Investment grade	478,945		—		478,945		—
Total available-for-sale investment securities	$	2,811,416	$	651,830	$	2,159,586	$	—

Investments in tax credit and other investments:
Equity securities with readily determinable fair value ⁽²⁾	$	30,987	$	20,489	$	10,498	$	—
Total investments in tax credit and other investments	$	30,987	$	20,489	$	10,498	$	—

Derivative assets⁽³⁾:
Interest rate swaps and options	$	51,933	$	—	$	51,933	$	—
Foreign exchange spot and forwards	6,087		—		6,087		—
RPAs	1		—		1		—
Equity warrants	1,513		—		582		931
Commodity options	297		—		297		—
Total derivative assets	$	59,831	$	—	$	58,900	$	931

Derivative liabilities:
Interest rate swaps ⁽³⁾	$	8,251	$	—	$	8,251	$	—
Foreign exchange forwards ⁽¹⁾	1,154		—		1,154		—
Interest rate swaps and options ⁽³⁾	72,893		—		72,893		—
Foreign exchange spot and forwards ⁽³⁾	4,066		—		4,066		—
RPAs ⁽³⁾	21		—		21		—
Commodity options ⁽³⁾	288		—		288		—
Total derivative liabilities	$	86,673	$	—	$	86,673	$	—


(1)	Changes in fair value of these financial instruments are recorded through other comprehensive income.


(2)	Equity securities with readily determinable fair value were comprised of mutual funds as of March 31, 2018. These securities are held at NAV and changes in fair value are recorded through net income.

(3) Changes in fair value of these financial instruments are recorded through net income.




($ in thousands)	Assets (Liabilities) Measured at Fair Value on a Recurring Basis as of December 31, 2017
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available-for-sale investment securities ⁽¹⁾:
U.S. Treasury securities	$	640,280	$	640,280	$	—	$	—
U.S. government agency and U.S. government sponsored enterprise debt securities	203,392		—		203,392		—
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	318,957		—		318,957		—
Residential mortgage-backed securities	1,190,271		—		1,190,271		—
Municipal securities	99,982		—		99,982		—
Non-agency residential mortgage-backed securities:
Investment grade	9,117		—		9,117		—
Corporate debt securities:
Investment grade	37,003		—		37,003		—
Foreign bonds:
Investment grade	486,408		—		486,408		—
Other securities	31,342		20,735		10,607		—
Total available-for-sale investment securities	$	3,016,752	$	661,015	$	2,355,737	$	—

Derivative assets ⁽²⁾:
Interest rate swaps and options	$	58,633	$	—	$	58,633	$	—
Foreign exchange spot and forwards	5,840		—		5,840		—
RPAs	1		—		1		—
Equity warrants	1,672		—		993		679
Total derivative assets	$	66,146	$	—	$	65,467	$	679

Derivative liabilities ⁽²⁾:
Interest rate swaps	$	6,799	$	—	$	6,799	$	—
Interest rate swaps and options	57,958		—		57,958		—
Foreign exchange spot and forwards	10,170		—		10,170		—
RPAs	8		—		8		—
Total derivative liabilities	$	74,935	$	—	$	74,935	$	—


(1)	Changes in fair value of these financial instruments are recorded through other comprehensive income.


(2)	Changes in fair value of these financial instruments are recorded through net income.

At each reporting period, all assets and liabilities for which the fair value measurement is based on significant unobservable inputs are classified as Level 3. As of March 31, 2018 and December 31, 2017, the only assets measured on a recurring basis that were classified as Level 3 were equity warrants issued by private companies. The following table presents a reconciliation of the beginning and ending balances for these warrants for the three months ended March 31, 2018:




($ in thousands)	Three Months Ended March 31, 2018
Equity warrants
Beginning balance	$	679
Total gains for the period included in earnings⁽¹⁾:	244
Issuances	8
Ending balance	$	931


(1)	Unrealized gains of warrant income are included in Ancillary loan fees and other income on the Consolidated Statement of Income.

Transfers into or out of fair value hierarchy classifications are made if the significant inputs used in the financial models measuring the fair value of the assets and liabilities become unobservable or observable in the current marketplace. The Company’s policy, with respect to transfers between levels of the fair value hierarchy, is to recognize transfers into and out of each level as of the end of the reporting period. There were no transfers of assets and liabilities measured on a recurring basis into and out of Level 1, Level 2 or Level 3 during the three months ended March 31, 2018 and 2017.

The following table presents quantitative information about significant unobservable inputs used in the valuation of assets measured on a recurring basis classified as Level 3 as of March 31, 2018. Significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets or liabilities. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets or liabilities would be impacted by a predetermined percentage change.




($ in thousands)	Fair Value Measurements (Level 3)		Valuation Technique	Unobservable Input(s)	Weighted- Average
Derivative assets:
Equity warrants	$	931	Black-Scholes option pricing model	Volatility	48%
				Liquidity discount	47%

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

The Company may be required, from time to time, to measure certain assets at fair value on a nonrecurring basis in accordance with U.S. GAAP. The adjustments to fair value generally require the assets to be recorded at the lower of cost or fair value, or assessed for impairment.

Assets measured at fair value on a nonrecurring basis include certain non-purchased credit impaired (“non-PCI”) loans that were impaired, OREO and loans held-for-sale. These fair value adjustments result from impairment on certain non-PCI loans, application of fair value less costs to sell on OREO or lower of cost or fair value on loans held-for-sale.

Non-PCI Impaired Loans — The Company typically adjusts the carrying amount of impaired loans when there is evidence of probable loss and when the expected fair value of the loan is less than its carrying amount. Impaired loans with specific reserves are classified as Level 3 assets. The following two methods are used to derive the fair value of impaired loans:


•	Discounted cash flow valuation techniques generally consist of developing an estimate of future cash flows that are expected to occur over the life of the loan and then discounting those cash flows.

•

The Company establishes a specific reserve for an impaired loan based on the fair value of the underlying collateral (which may take the form of real estate, inventory, equipment, contracts or guarantees). The fair value of the underlying collateral is generally based on third party appraisals (or internal evaluation if a third party appraisal is not required by regulations), which utilize one or more valuation techniques (income, market and/or cost approaches).

Other Real Estate Owned — The Company’s OREO represents properties acquired through foreclosure, or through full or partial satisfaction of loans held-for-investment, which are recorded at estimated fair value less the costs to sell at the time of foreclosure and at the lower of cost or estimated fair value less the costs to sell subsequent to acquisition. On a monthly basis, the current fair market value of each OREO property is reviewed to ensure that the current carrying value is appropriate. OREO properties are classified as Level 3.

The following tables present the carrying amounts of assets included on the Consolidated Balance Sheet that had fair value changes measured on a nonrecurring basis as of March 31, 2018 and December 31, 2017:




	Assets Measured at Fair Value on a Nonrecurring Basis as of March 31, 2018
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Non-PCI impaired loans:
Commercial lending:
Commercial and industrial (“C&I”)	$	29,403	$	—	$	—	$	29,403
Commercial real estate (“CRE”)	5,171		—		—		5,171
Consumer lending:
Single-family residential	2,600		—		—		2,600
Total non-PCI impaired loans	$	37,174	$	—	$	—	$	37,174




	Assets Measured at Fair Value on a Nonrecurring Basis as of December 31, 2017
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Non-PCI impaired loans:
Commercial lending:
C&I	$	31,404	$	—	$	—	$	31,404
CRE	2,667		—		—		2,667
Construction and land	3,973		—		—		3,973
Consumer lending:
Single-family residential	144		—		—		144
Total non-PCI impaired loans	$	38,188	$	—	$	—	$	38,188
OREO	$	9	$	—	$	—	$	9

The following table presents the fair value adjustments of assets measured on a nonrecurring basis recognized during the three months ended and included on the Consolidated Balance Sheet as of March 31, 2018 and 2017:




	Three Months Ended March 31,
($ in thousands)	2018			2017
Non-PCI impaired loans:
Commercial lending:
C&I	$	13,899		$	32
CRE	95			(64		)
Consumer lending:
Single-family residential	(15		)	82
Other consumer	—			(1		)
Total non-PCI impaired loans	$	13,979		$	49
OREO	$	—		$	(285	)

The following table presents the quantitative information about the significant unobservable inputs used in the valuation of assets measured on a nonrecurring basis classified as Level 3 as of March 31, 2018 and December 31, 2017:




($ in thousands)	Fair Value Measurements (Level 3)		Valuation Technique(s)	Unobservable Input(s)	Range of Input(s)	Weighted-Average
March 31, 2018
Non-PCI impaired loans	$	28,596	Discounted cash flows	Discount	4% — 7%	5%
	$	3,114	Fair value of property	Selling cost	8%	8%
	$	4,849	Fair value of collateral	Discount	15% — 50%	39%
	$	615	Fair value of collateral	Contract value	NM	NM
December 31, 2017
Non-PCI impaired loans	$	22,802	Discounted cash flows	Discount	4% — 10%	6%
	$	9,773	Fair value of property	Selling cost	8%	8%
	$	3,207	Fair value of collateral	Discount	20% — 32%	29%
	$	2,406	Fair value of collateral	Contract value	NM	NM
OREO	$	9	Fair value of property	Selling cost	8%	8%

NM — Not meaningful.

Disclosures about Fair Value of Financial Instruments

The following tables present the fair value estimates for financial instruments as of March 31, 2018 and December 31, 2017, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in Note 4 — Fair Value Measurement and Fair Value of Financial Instruments. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable, accrued interest payable and mortgage servicing rights, which are included in Other assets. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. During the first quarter of 2018, the Company adopted ASU 2016-01 and has updated its valuation methods as necessary to conform to an “exit price” concept as required by ASU 2016-01.




($ in thousands)	March 31, 2018
($ in thousands)	Carrying Amount		Level 1		Level 2		Level 3		Estimated Fair Value
Financial assets:
Cash and cash equivalents	$	2,314,938	$	2,314,938	$	—	$	—	$	2,314,938
Interest-bearing deposits with banks	$	478,871	$	—	$	478,871	$	—	$	478,871
Resale agreements ⁽¹⁾	$	1,050,000	$	—	$	1,026,415	$	—	$	1,026,415
Restricted equity securities	$	73,787	$	—	$	73,787	$	—	$	73,787
Loans held-for-sale	$	46,181	$	—	$	46,181	$	—	$	46,181
Loans held-for-investment, net	$	29,257,594	$	—	$	—	$	29,503,038	$	29,503,038
Mortgage servicing rights	$	7,659	$	—	$	—	$	12,626	$	12,626
Accrued interest receivable	$	127,905	$	—	$	127,905	$	—	$	127,905
Financial liabilities:
Customer deposits:
Demand, checking, savings and money market deposits	$	26,407,708	$	—	$	26,407,708	$	—	$	26,407,708
Time deposits	$	6,201,069	$	—	$	6,177,010	$	—	$	6,177,010
Short-term borrowings	$	30,277	$	—	$	30,277	$	—	$	30,277
FHLB advances	$	324,451	$	—	$	335,788	$	—	$	335,788
Repurchase agreements ⁽¹⁾	$	50,000	$	—	$	114,260	$	—	$	114,260
Long-term debt	$	166,640	$	—	$	172,521	$	—	$	172,521
Accrued interest payable	$	12,686	$	—	$	12,686	$	—	$	12,686


(1)	Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of March 31, 2018, $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements.




($ in thousands)	December 31, 2017
($ in thousands)	Carrying Amount		Level 1		Level 2		Level 3		Estimated Fair Value
Financial assets:
Cash and cash equivalents	$	2,174,592	$	2,174,592	$	—	$	—	$	2,174,592
Interest-bearing deposits with banks	$	398,422	$	—	$	398,422	$	—	$	398,422
Resale agreements ⁽¹⁾	$	1,050,000	$	—	$	1,035,158	$	—	$	1,035,158
Restricted equity securities	$	73,521	$	—	$	73,521	$	—	$	73,521
Loans held-for-sale	$	85	$	—	$	85	$	—	$	85
Loans held-for-investment, net	$	28,688,590	$	—	$	—	$	28,956,349	$	28,956,349
Branch assets held-for-sale	$	91,318	$	5,143	$	10,970	$	78,132	$	94,245
Mortgage servicing rights	$	7,771	$	—	$	—	$	11,324	$	11,324
Accrued interest receivable	$	121,719	$	—	$	121,719	$	—	$	121,719
Financial liabilities:
Customer deposits:
Demand, checking, savings and money market deposits	$	25,974,314	$	—	$	25,974,314	$	—	$	25,974,314
Time deposits	$	5,640,749	$	—	$	5,626,855	$	—	$	5,626,855
Branch liability held-for-sale	$	605,111	$	—	$	—	$	643,937	$	643,937
FHLB advances	$	323,891	$	—	$	335,901	$	—	$	335,901
Repurchase agreements ⁽¹⁾	$	50,000	$	—	$	104,830	$	—	$	104,830
Long-term debt	$	171,577	$	—	$	171,673	$	—	$	171,673
Accrued interest payable	$	10,724	$	—	$	10,724	$	—	$	10,724


(1)	Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of December 31, 2017, $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements

3 Months Ended

Mar. 31, 2018

Resale and Repurchase Agreements [Abstract]

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements

Resale Agreements

Resale agreements are recorded at the values at which the securities were acquired. The market values of the underlying securities collateralizing the related receivable of the resale agreements, including accrued interest, are monitored. Additional collateral may be requested by the Company from the counterparty when deemed appropriate. Gross resale agreements were $1.45 billion as of both March 31, 2018 and December 31, 2017. The weighted-average interest rates were 2.55% and 2.43% as of March 31, 2018 and December 31, 2017, respectively.

Repurchase Agreements

Long-term repurchase agreements are accounted for as collateralized financing transactions and recorded at the values at which the securities are sold. The collateral for the repurchase agreements is primarily comprised of U.S. Treasury securities, U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, and U.S. government agency and U.S. government sponsored enterprise debt securities. The Company may have to provide additional collateral for the repurchase agreements, as necessary. Gross repurchase agreements were $450.0 million as of both March 31, 2018 and December 31, 2017. The weighted-average interest rates were 4.07% and 3.65% as of March 31, 2018 and December 31, 2017, respectively.

Balance Sheet Offsetting

The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase agreements that provide the Company, in the event of default by the counterparty, the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheet when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45-11. Collateral accepted includes securities that are not recognized on the Consolidated Balance Sheet. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheet against the related collateralized liability. Collateral accepted or pledged in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, but is usually delivered to and held by the third party trustees. The collateral amounts received/pledged are limited for presentation purposes to the related recognized asset/liability balance for each counterparty, and accordingly, do not include excess collateral received/pledged.

The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of March 31, 2018 and December 31, 2017:




($ in thousands)	As of March 31, 2018
	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Assets Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Received				Net Amount
Resale agreements	$	1,450,000	$	(400,000	)	$	1,050,000	$	—	$	(1,037,413	)	⁽¹⁾	$	12,587

	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Liabilities Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Pledged				Net Amount
Repurchase agreements	$	450,000	$	(400,000	)	$	50,000	$	—	$	(50,000	)	⁽²⁾	$	—




($ in thousands)	As of December 31, 2017
	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Assets Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Received				Net Amount
Resale agreements	$	1,450,000	$	(400,000	)	$	1,050,000	$	—	$	(1,045,696	)	⁽¹⁾	$	4,304

	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Liabilities Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Pledged				Net Amount
Repurchase agreements	$	450,000	$	(400,000	)	$	50,000	$	—	$	(50,000	)	⁽²⁾	$	—


(1)	Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty.


(2)	Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty.

In addition to the amounts included in the tables above, the Company also has balance sheet netting related to derivatives, refer to Note 7 — Derivatives to the Consolidated Financial Statements for additional information.

Securities

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Securities

The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of available-for-sale investment securities carried at fair value, as of March 31, 2018 and December 31, 2017:




	As of March 31, 2018
($ in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale investment securities:
U.S. Treasury securities	$	668,670	$	93	$	(16,933	)	$	651,830
U.S. government agency and U.S. government sponsored enterprise debt securities	235,776		175		(2,935		)	233,016
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	352,980		170		(13,316		)	339,834
Residential mortgage-backed securities	1,008,235		1,844		(20,626		)	989,453
Municipal securities	74,942		251		(1,117		)	74,076
Non-agency residential mortgage-backed securities:
Investment grade ⁽¹⁾	8,547		—		(143		)	8,404
Corporate debt securities:
Investment grade ⁽¹⁾	36,379		178		(699		)	35,858
Foreign bonds:
Investment grade ^{(1) (2)}	505,364		—		(26,419		)	478,945
Total available-for-sale investment securities	$	2,890,893	$	2,711	$	(82,188	)	$	2,811,416



	As of December 31, 2017
($ in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale investment securities:
U.S. Treasury securities	$	651,395	$	—	$	(11,115	)	$	640,280
U.S. government agency and U.S. government sponsored enterprise debt securities	206,815		62		(3,485		)	203,392
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	328,348		141		(9,532		)	318,957
Residential mortgage-backed securities	1,199,869		3,964		(13,562		)	1,190,271
Municipal securities	99,636		655		(309		)	99,982
Non-agency residential mortgage-backed securities:
Investment grade ⁽¹⁾	9,136		3		(22		)	9,117
Corporate debt securities:
Investment grade ⁽¹⁾	37,585		164		(746		)	37,003
Foreign bonds:
Investment grade ^{(1) (2)}	505,396		24		(19,012		)	486,408
Other securities ⁽³⁾	31,887		—		(545		)	31,342
Total available-for-sale investment securities	$	3,070,067	$	5,013	$	(58,328	)	$	3,016,752


(1)	Available-for-sale investment securities rated BBB- or higher by Standard & Poor’s (“S&P”) or Baa3 or higher by Moody’s are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody’s are considered non-investment grade. Classifications are based on the lower of the credit ratings by S&P or Moody’s.


(2)	Fair value of foreign bonds include $448.5 million and $456.1 million of multilateral development bank bonds as of March 31, 2018 and December 31, 2017, respectively.

(3)

Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities to Investments in tax credit and other investments, net, with changes in fair value recorded through net income.

Unrealized Losses

The following tables present the gross unrealized losses and related fair value of the Company’s investment portfolio, aggregated by investment category and the length of time that individual security has been in a continuous unrealized loss position, as of March 31, 2018 and December 31, 2017:




	As of March 31, 2018
($ in thousands)	Less Than 12 Months					12 Months or More					Total
($ in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-sale investment securities:
U.S. Treasury securities	$	170,103	$	(3,130	)	$	457,952	$	(13,803	)	$	628,055	$	(16,933	)
U.S. government agency and U.S. government sponsored enterprise debt securities	133,861		(2,157		)	86,549		(778		)	220,410		(2,935		)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	117,057		(3,255		)	192,874		(10,061		)	309,931		(13,316		)
Residential mortgage-backed securities	461,197		(8,362		)	339,157		(12,264		)	800,354		(20,626		)
Municipal securities	24,618		(671		)	8,323		(446		)	32,941		(1,117		)
Non-agency residential mortgage-backed securities:
Investment grade	8,404		(143		)	—		—			8,404		(143		)
Corporate debt securities:
Investment grade	—		—			10,742		(699		)	10,742		(699		)
Foreign bonds:
Investment grade	130,436		(5,010		)	348,510		(21,409		)	478,946		(26,419		)
Total available-for-sale investment securities	$	1,045,676	$	(22,728	)	$	1,444,107	$	(59,460	)	$	2,489,783	$	(82,188	)



	As of December 31, 2017
($ in thousands)	Less Than 12 Months					12 Months or More					Total
($ in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-sale investment securities:
U.S. Treasury securities	$	168,061	$	(1,005	)	$	472,219	$	(10,110	)	$	640,280	$	(11,115	)
U.S. government agency and U.S. government sponsored enterprise debt securities	99,935		(623		)	85,281		(2,862		)	185,216		(3,485		)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	113,775		(2,071		)	191,827		(7,461		)	305,602		(9,532		)
Residential mortgage-backed securities	413,621		(4,205		)	361,809		(9,357		)	775,430		(13,562		)
Municipal securities	8,490		(123		)	8,588		(186		)	17,078		(309		)
Non-agency residential mortgage-backed securities:
Investment grade	4,599		(22		)	—		—			4,599		(22		)
Corporate debt securities:
Investment grade	—		—			11,905		(746		)	11,905		(746		)
Foreign bonds:
Investment grade	103,149		(1,325		)	352,239		(17,687		)	455,388		(19,012		)
Other securities⁽¹⁾	31,215		(545		)	—		—			31,215		(545		)
Total available-for-sale investment securities	$	942,845	$	(9,919	)	$	1,483,868	$	(48,409	)	$	2,426,713	$	(58,328	)

(1)

Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities, at fair value to Investments in tax credit and other investments, net, with changes in fair value recorded through net income.

For each reporting period, the Company examines all individual securities that are in an unrealized loss position for Other-Than-Temporary-Impairment (“OTTI”). For a discussion of the factors and criteria the Company uses in analyzing securities for OTTI, see Note 1 — Summary of Significant Accounting Policies — Securities to the Consolidated Financial Statements of the Company’s 2017 Form 10-K.

The unrealized losses were primarily attributable to the yield curve movement, in addition to widened liquidity and credit spreads. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. These securities have fluctuated in value since their purchase dates as market interest rates have fluctuated. The Company believes that the gross unrealized losses detailed in the previous tables are temporary and no credit loss is expected. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, no impairment loss was recorded on the Company’s Consolidated Statement of Income for each of the three months ended March 31, 2018 and 2017. As of March 31, 2018, the Company had 192 available-for-sale investment securities in a gross unrealized loss position with no credit impairment, primarily comprised of 111 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 23 U.S. Treasury securities and 17 investment grade foreign bonds. In comparison, as of December 31, 2017, the Company had 165 available-for-sale investment securities in a gross unrealized loss position with no credit impairment, primarily comprised of 98 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 25 U.S. Treasury securities and 16 investment grade foreign bonds.

Other-Than-Temporary Impairment

No OTTI credit losses were recognized for each of the three months ended March 31, 2018 and 2017.

Realized Gains and Losses

The following table presents the proceeds, gross realized gains and tax expense related to the sales of available-for-sale investment securities for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Proceeds from sales	$	214,790	$	302,656
Gross realized gains	$	2,129	$	2,474
Related tax expense	$	628	$	1,040

Scheduled Maturities of Investment Securities

The following table presents the scheduled maturities of available-for-sale investment securities as of March 31, 2018:




($ in thousands)	Amortized Cost		Fair Value
Due within one year	$	573,138	$	549,190
Due after one year through five years	818,412		796,717
Due after five years through ten years	188,149		184,944
Due after ten years	1,311,194		1,280,565
Total available-for-sale investment securities	$	2,890,893	$	2,811,416

Actual maturities of mortgage-backed securities can differ from contractual maturities as the borrowers have the right to prepay obligations. In addition, factors such as prepayments and interest rates may affect the yields on the carrying values of mortgage-backed securities.

Available-for-sale investment securities with fair value of $498.7 million and $534.3 million as of March 31, 2018 and December 31, 2017, respectively, were primarily pledged to secure repurchase agreements, public deposits, the FRB’s discount window and for other purposes required or permitted by law.

Restricted Equity Securities

Restricted equity securities include stock of the FRB and of the FHLB. Restricted equity securities are carried at cost as these securities do not have a readily determinable fair value. The following table presents the restricted equity securities as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018		December 31, 2017
FRB stock	$	56,537	$	56,271
FHLB stock	17,250		17,250
Total	$	73,787	$	73,521

Derivatives

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

The Company uses derivatives to manage exposure to market risk, primarily interest rate risk and foreign currency risk, and to assist customers with their risk management objectives. The Company’s goal is to manage interest rate sensitivity and volatility so that movements in interest rates are not significant to earnings or capital. The Company also uses foreign exchange contracts to manage the foreign exchange rate risk associated with certain foreign currency-denominated assets and liabilities, as well as the Company’s investment in its China subsidiary, East West Bank (China) Limited. The Company recognizes all derivatives on the Consolidated Balance Sheet at fair value. While the Company designates certain derivatives as hedging instruments in a qualifying hedge accounting relationship, other derivatives consist of economic hedges. For additional information on the Company’s derivatives and hedging activities, see Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2017 Form 10-K.

The following table presents the total notional and gross fair value of the Company’s derivatives as of March 31, 2018 and December 31, 2017. The derivative asset and liability balances are presented on a gross basis, prior to the application of master netting arrangements, as included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheet.




($ in thousands)	March 31, 2018							December 31, 2017
	Notional Amount			Fair Value				Notional Amount			Fair Value
	Notional Amount			Derivative Assets		Derivative Liabilities		Notional Amount			Derivative Assets		Derivative Liabilities
Derivatives designated as hedging instruments:
Fair value hedges:
Interest rate swaps	$	35,811		$	—	$	8,251	$	35,811		$	—	$	6,799
Net investment hedges:
Foreign exchange forwards	97,464			—		1,154		—			—		—
Total derivatives designated as hedging instruments	$	133,275		$	—	$	9,405	$	35,811		$	—	$	6,799
Derivatives not designated as hedging instruments:
Interest rate swaps and options	$	10,155,401		$	51,933	$	72,893	$	9,333,860		$	58,633	$	57,958
Foreign exchange spot and forwards	895,788			6,087		4,066		770,215			5,840		10,170
Credit risk participation agreements	81,928			1		21		49,033			1		8
Equity warrants	—		⁽¹⁾	1,513		—		—		⁽¹⁾	1,672		—
Commodity options	—		⁽²⁾	297		288		—			—		—
Total derivatives not designated as hedging instruments	$	11,133,117		$	59,831	$	77,268	$	10,153,108		$	66,146	$	68,136


(1)	The Company held four warrants in public companies and 24 warrants in private companies as of March 31, 2018. The Company held four warrants in public companies and 23 warrants in private companies as of December 31, 2017.


(2)	The notional amount of the Company’s commodity option contracts entered with its customers and Chicago Mercantile Exchange (“CME”) totaled 216,000 barrels of oil each as of March 31, 2018.

Derivatives Designated as Hedging Instruments

Fair Value Hedges — The Company is exposed to changes in the fair value of certain fixed rate certificates of deposit due to changes in the benchmark interest rate, the London Interbank Offered Rate. The Company entered into interest rate swaps, which were designated as fair value hedges. The interest rate swaps involve the receipt of fixed rate amounts from a counterparty in exchange for the Company making variable rate payments over the life of the agreements without the exchange of the underlying notional amount.

The total notional amounts of the interest rate swaps on certificates of deposit were $35.8 million as of both March 31, 2018 and December 31, 2017. The fair value liabilities of the interest rate swaps were $8.3 million and $6.8 million as of March 31, 2018 and December 31, 2017, respectively.

The following table presents the net (losses) gains recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018			2017
(Losses) gains recorded in interest expense:
Recognized on interest rate swaps	$	(1,452	)	$	(817	)
Recognized on certificates of deposit	$	1,279		$	688

The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of March 31, 2018:




($ in thousands)	March 31, 2018
	Hedged Items Currently Designated
	Carrying Amount of the Hedged Assets (Liabilities) ⁽¹⁾			Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (Liabilities)
Certificates of deposit	$	(29,779	)	$	6,024


(1)	The balance represents the full carrying amount of the hedged certificates of deposit as of the balance sheet date.

Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions, and ASC 815, Derivatives and Hedging, allows hedging of the foreign currency risk of a net investment in a foreign operation. The Company enters into foreign currency forward contracts to hedge its investment in East West Bank (China) Limited, a non-USD functional currency subsidiary of the Company in China. The hedging instruments designated as net investment hedges, involve hedging the risk of changes in the USD equivalent value of a designated monetary amount of the Company’s net investment in East West Bank (China) Limited, against the risk of adverse changes in the foreign currency exchange rate. The Company may de-designate the net investment hedges when the Company expects the hedge will cease to be highly effective. During the first quarter of 2017, the Company discontinued hedge accounting of the foreign currency forward contracts and continued to economically hedge its foreign currency exposure in its China subsidiary through foreign exchange forward contracts, which were included as part of the Derivatives Not Designated as Hedging Instruments — Foreign Exchange Contracts section. The cumulative effective portion of the net investment hedges recorded through the point of de-designation remained in the Foreign currency translation adjustment account within AOCI and will be reclassified into earnings only upon the sale or liquidation of the China subsidiary. During the first quarter of 2018, the Company entered into new foreign currency forward contracts designated as net investment hedges to hedge against the foreign currency exchange rate risk in connection with its investment in East West Bank (China) Limited.

As of March 31, 2018, the total notional amount and fair value of the foreign currency forward contracts designated as the net investment hedges were $97.5 million and a $1.2 million liability, respectively. As of December 31, 2017, there were no derivative contracts designated as net investment hedges. As a result of the adoption of ASU 2017-12, the Company recorded the total fair value change of $1.2 million in the Foreign Currency Translation Adjustment account within AOCI during the three months ended March 31, 2018. During the three months ended March 31, 2017, before the adoption of ASU 2017-12, the Company recorded a loss of $648 thousand in the Foreign Currency Translation Adjustment account within AOCI related to the effective portion of the net investment hedges, and a loss of $2.0 million in the Letters of credit fees and foreign exchange income on the Consolidated Statement of Income related to the ineffective portion of the net investment hedges.

Derivatives Not Designated as Hedging Instruments

Interest Rate Swaps and Options — The Company enters into interest rate derivatives including interest rate swaps and options with its customers to allow them to hedge against the risk of rising interest rates on their variable rate loans. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored interest rate contracts with institutional counterparties such as LCH, as a central counterparty. As of March 31, 2018, the total notional amounts of interest rate swaps and options, including mirrored transactions with institutional counterparties and the Company’s customers, totaled $5.11 billion for derivatives that were in an asset valuation position and $5.05 billion for derivatives that were in a liability valuation position. As of December 31, 2017, the total notional amounts of interest rate swaps and options, including mirrored transactions with institutional counterparties and the Company’s customers, totaled $4.69 billion for derivatives that were in an asset valuation position and $4.65 billion for derivatives that were in a liability valuation position. The fair value of interest rate swap and option contracts with institutional counterparties and the Company’s customers amounted to a $51.9 million asset and a $72.9 million liability as of March 31, 2018. The fair value of interest rate swap and option contracts with institutional counterparties and the Company’s customers amounted to a $58.6 million asset and a $58.0 million liability as of December 31, 2017. Beginning in January 2018, LCH amended its rulebook to legally characterize variation margin payments made to and received from LCH as settlement of derivatives and not as collateral against derivatives. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative asset and liability fair values of $25.7 million and $3.0 million, respectively, as of March 31, 2018. Included in the total notional amount of $10.16 billion of interest rates swaps and options is a notional amount of $1.40 billion of interest rate swaps that cleared through LCH with a fair value of approximately zero as of March 31, 2018.

Foreign Exchange Spot and Forwards — The Company enters into foreign exchange contracts with its customers, primarily comprised of spot and forward contracts to enable its customers to hedge their transactions in foreign currencies against fluctuations in foreign exchange rates, and also to allow the Company to economically hedge against foreign currency fluctuations in certain foreign currency denominated deposits that it offers to its customers. For a majority of the foreign exchange transactions entered with its customers, the Company enters into offsetting foreign exchange contracts with institutional counterparties to mitigate the foreign exchange rate risk. A majority of these contracts have original maturities of one year or less. As of March 31, 2018 and December 31, 2017, the total notional amounts of the foreign exchange contracts were $895.8 million and $770.2 million, respectively. The fair value of the foreign exchange contracts recorded were a $6.1 million asset and a $4.1 million liability as of March 31, 2018. The fair value of the foreign exchange contracts recorded were a $5.8 million asset and a $10.2 million liability as of December 31, 2017.

Credit Risk Participation Agreements — The Company has entered into RPAs with institutional counterparties, under which the Company assumed its pro-rata share of the credit exposure associated with a borrower’s performance related to interest rate derivative contracts. The Company may or may not be a party to the interest rate derivative contract and enters into such RPAs in instances where the Company is a party to the related loan participation agreement with the borrower. The Company will make or receive payments under the RPAs if the borrower defaults on its obligation to perform under the interest rate derivative contract. The Company manages its credit risk on the RPAs by monitoring the credit worthiness of the borrowers, which is based on the normal credit review process. The notional amount of the RPAs reflects the Company’s pro-rata share of the derivative instrument. As of March 31, 2018, the notional amount and fair value of the RPAs purchased were $68.9 million and a $21 thousand liability, respectively. As of March 31, 2018, the notional amount and fair value of the RPAs sold were $13.0 million and a $1 thousand asset, respectively. As of December 31, 2017, the notional amount and fair value of the RPAs purchased were $35.2 million and an $8 thousand liability, respectively. As of December 31, 2017, the notional amount and fair value of the RPAs sold were $13.8 million and a $1 thousand asset, respectively. Assuming all underlying borrowers referenced in the interest rate derivative contracts defaulted as of March 31, 2018 and December 31, 2017, the exposures from the RPAs purchased would be $756 thousand and $419 thousand, respectively. As of March 31, 2018 and December 31, 2017, the weighted-average remaining maturities of the outstanding RPAs were 6.7 years and 6.0 years, respectively.

Equity Warrants — The Company has obtained warrants to purchase preferred and common stock of technology and life sciences companies, as part of the loan origination process. As of March 31, 2018, the Company held four warrants in public companies and 24 warrants in private companies. The fair value of the warrants for public and private companies were a $582 thousand asset and a $931 thousand asset, respectively, totaling $1.5 million as of March 31, 2018. As of December 31, 2017, the Company held four warrants in public companies and 23 warrants in private companies. The fair value of the warrants for public and private companies were a $993 thousand asset and a $679 thousand asset, respectively, totaling $1.7 million as of December 31, 2017.

Commodity Options — In 2018, the Company entered into energy commodity contracts in the form of options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. To economically hedge against the risk of fluctuation in commodity prices in the products offered to its customers, the Company entered into mirrored commodity contracts with CME. As of March 31, 2018, the total notional amount of the commodity contracts include 216,000 barrels of crude oil options with customers and 216,000 barrels of crude oil options with CME. The fair value of the commodity contracts recorded were a $297 thousand asset and a $288 thousand liability as of March 31, 2018. Beginning in January 2017, CME amended its rulebook to legally characterize variation margin payments made to and received from CME as settlement of derivatives and not as collateral against derivatives. Applying variation margin payments as settlement to CME cleared derivative transactions resulted in a reduction in derivative asset and liability fair values of $276 thousand and $297 thousand, respectively, as of March 31, 2018. As a result, the notional quantity totaling 216,000 barrels of oil that cleared through CME had an insignificant fair value as of March 31, 2018. The Company did not have any commodity contracts in 2017.

The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three months ended March 31, 2018 and 2017:




($ in thousands)	Location in Consolidated Statement of Income	Three Months Ended March 31,
($ in thousands)	Location in Consolidated Statement of Income	2018			2017
Derivatives not designated as hedging instruments:
Interest rate swaps and options	Derivative fees and other income	$	1,106		$	(1,066	)
Foreign exchange spot and forwards	Letters of credit fees and foreign exchange income	3,857			5,838
Credit risk participation agreements	Derivative fees and other income	(13		)	1
Equity warrants	Ancillary loan fees and other income	(159		)	—
Commodity options	Derivative fees and other income	—			—
Net gains		$	4,791		$	4,773

Credit-Risk-Related Contingent Features — Certain over-the-counter derivative contracts of the Company contain early termination provisions that may require the Company to settle any outstanding balances upon the occurrence of a specified credit-risk-related event. These events, which are defined by the existing derivative contracts, primarily relate to a downgrade in the credit rating of East West Bank to below investment grade. As of March 31, 2018 and December 31, 2017, the aggregate fair value of all derivative instruments with such credit-risk-related contingent features that are in a net liability position was $14.9 million and $6.3 million, respectively, with collateral posted of $12.3 million and $6.2 million, respectively. In the event that East West Bank’s credit rating had been downgraded to below investment grade, approximately $3.5 million of collateral would have been required to be posted as of March 31, 2018. Minimal additional collateral would have been required to be posted as of December 31, 2017.

Offsetting of Derivatives

The Company has entered into agreements with certain counterparty financial institutions, which include master netting agreements. However, the Company has elected to account for all derivatives with counterparty institutions on a gross basis. The following tables present gross derivatives on the Consolidated Balance Sheet and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities and/or cash. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability (after netting is applied); thus instances of overcollateralization are not shown:




($ in thousands)	As of March 31, 2018
($ in thousands)	Total		Contracts Not Subject to Master Netting Arrangements		Contracts Subject to Master Netting Arrangements
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amount				Collateral Received				Net Amount
Derivative Assets	$	59,831	$	20,954	$	38,877	$	—	$	38,877	$	(12,957	)	⁽¹⁾	$	(23,810	)	⁽²⁾	$	2,110

	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amount				Collateral Posted				Net Amount
Derivative Liabilities	$	86,673	$	61,135	$	25,538	$	—	$	25,538	$	(12,957	)	⁽¹⁾	$	(12,038	)	⁽³⁾	$	543




($ in thousands)	As of December 31, 2017
($ in thousands)	Total		Contracts Not Subject to Master Netting Arrangements		Contracts Subject to Master Netting Arrangements
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amounts				Collateral Received				Net Amount
Derivative Assets	$	66,146	$	36,941	$	29,205	$	—	$	29,205	$	(18,955	)	⁽¹⁾	$	(9,839	)	⁽²⁾	$	411

	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amounts				Collateral Posted				Net Amount
Derivative Liabilities	$	74,935	$	26,732	$	48,203	$	—	$	48,203	$	(18,955	)	⁽¹⁾	$	(28,796	)	⁽³⁾	$	452


(1)	Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable master netting arrangements if the Company has elected to net.


(2)	Represents cash and securities received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements, including $6.9 million and $8.6 million of cash collateral received as of March 31, 2018 and December 31, 2017, respectively.


(3)	Represents cash and securities pledged against derivative liabilities with the same counterparty that are subject to enforceable master netting arrangements, including $1.5 million and $10.7 million of cash collateral posted as of March 31, 2018 and December 31, 2017, respectively.

In addition to the amounts included in the tables above, the Company also has balance sheet netting related to resale and repurchase agreements. Refer to Note 5 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements for additional information. Refer to Note 4 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements for fair value measurement disclosures on derivatives.

Loans Receivable and Allowance for Credit Losses

3 Months Ended

Mar. 31, 2018

Loans and Leases Receivable Disclosure [Abstract]

Loans Receivable and Allowance for Credit Losses

The Company’s held-for-investment loan portfolio includes originated and purchased loans. Originated and purchased loans with no evidence of credit deterioration at their acquisition date are referred to collectively as non-PCI loans. PCI loans are loans acquired with evidence of credit deterioration since their origination and for which it is probable at the acquisition date that the Company would be unable to collect all contractually required payments. PCI loans are accounted for under ASC Subtopic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. The Company has elected to account for PCI loans on a pool level basis under ASC 310-30 at the time of acquisition.

The following table presents the composition of the Company’s non-PCI and PCI loans as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018									December 31, 2017
($ in thousands)	Non-PCI Loans ⁽¹⁾			PCI Loans ⁽²⁾			Total ⁽¹⁾⁽²⁾			Non-PCI Loans ⁽¹⁾			PCI Loans ⁽²⁾			Total ⁽¹⁾⁽²⁾
Commercial lending:
C&I	$	10,807,262		$	11,042		$	10,818,304		$	10,685,436		$	11,795		$	10,697,231
CRE	8,762,910			259,836			9,022,746			8,659,209			277,688			8,936,897
Multifamily residential	1,898,517			56,338			1,954,855			1,855,128			61,048			1,916,176
Construction and land	669,296			44			669,340			659,326			371			659,697
Total commercial lending	22,137,985			327,260			22,465,245			21,859,099			350,902			22,210,001
Consumer lending:
Single-family residential	4,818,094			112,486			4,930,580			4,528,911			117,378			4,646,289
Home equity lines of credit (“HELOCs”)	1,762,786			12,657			1,775,443			1,768,917			14,007			1,782,924
Other consumer	383,980			—			383,980			336,504			—			336,504
Total consumer lending	6,964,860			125,143			7,090,003			6,634,332			131,385			6,765,717
Total loans held-for-investment	$	29,102,845		$	452,403		$	29,555,248		$	28,493,431		$	482,287		$	28,975,718
Allowance for loan losses	(297,607		)	(47		)	(297,654		)	(287,070		)	(58		)	(287,128		)
Loans held-for-investment, net	$	28,805,238		$	452,356		$	29,257,594		$	28,206,361		$	482,229		$	28,688,590


(1)	Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(36.6) million and $(34.0) million as of March 31, 2018 and December 31, 2017, respectively.


(2)	Includes ASC 310-30 discount of $32.2 million and $35.3 million as of March 31, 2018 and December 31, 2017, respectively.

The commercial lending portfolio includes C&I, CRE, multifamily residential, and construction and land loans. Consumer lending portfolio includes single-family residential, HELOC and other consumer loans.

The C&I loan portfolio, which is comprised of commercial business and trade finance loans, provides financing to businesses in a wide spectrum of industries. The CRE loan portfolio includes income producing real estate loans where the interest rates may be fixed, variable or hybrid. Included in the CRE loan portfolio are owner occupied and non-owner occupied loans (where 50% or more of the debt service for the loan is provided by rental income). Construction loans in the construction and land loan portfolio mainly provide financing for the construction of hotels, multifamily and residential condominiums, as well as mixed use (residential and retail) structures.

Residential loans are comprised of multifamily residential loans in the commercial lending portfolio and single-family residential loans in the consumer lending portfolio. The Company offers a variety of first lien mortgage loan programs, including fixed rate conforming loans as well as adjustable rate mortgage loans with interest rates that adjust annually after the initial fixed rate periods of one to seven years.

The HELOC loan portfolio is largely comprised of loans originated through a reduced documentation loan program, where a substantial down payment is required, resulting in a low loan-to-value ratio, typically 60% or less at origination. The Company is in a first lien position for many of these reduced documentation HELOCs. These loans have historically experienced low delinquency and default rates. Other consumer loans are mainly comprised of insurance premium financing and credit card loans.

All loans originated are subject to the Company’s underwriting guidelines and loan origination standards. Management believes that the Company’s underwriting criteria and procedures adequately consider the unique risks associated with these products. The Company conducts a variety of quality control procedures and periodic audits, including the review of lending and legal requirements, to ensure that it is in compliance with these requirements.

As of March 31, 2018 and December 31, 2017, loans totaling $19.50 billion and $18.88 billion, respectively, were pledged to secure borrowings and to provide additional borrowing capacity from the FRB and the FHLB.

Credit Quality Indicators

All loans are subject to the Company’s internal and external credit review and monitoring. Loans are risk rated based on an analysis of the current state of the borrower’s credit quality. The analysis of credit quality includes a review of all repayment sources, the borrower’s current payment performance/delinquency, current financial and liquidity status and all other relevant information. For single-family residential loans, payment performance/delinquency is the driving indicator for the risk ratings. Risk ratings are the overall credit quality indicator for the Company and the credit quality indicator utilized for estimating the appropriate allowance for loan losses. The Company utilizes a risk rating system, which classifies loans within the following categories: Pass, Watch, Special Mention, Substandard, Doubtful and Loss. The risk ratings reflect the relative strength of the repayment sources.

Pass and Watch loans are loans that have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are loans that have potential weaknesses that warrant closer attention by management. Special Mention is a transitory grade. If potential weaknesses are resolved, the loan is upgraded to a Pass or Watch grade. If negative trends in the borrower’s financial status or other information indicate that the repayment sources may become inadequate, the loan is downgraded to a Substandard grade. Substandard loans are loans that have well-defined weaknesses that jeopardize the full and timely repayment of the loan. Substandard loans have a distinct possibility of loss, if the deficiencies are not corrected. Additionally, when management has assessed a potential for loss but a distinct possibility of loss is not recognizable, the loan remains classified as Substandard grade. Doubtful loans have insufficient sources of repayment and a high probability of loss. Loss loans are loans that are uncollectible and of such little value that they are no longer considered bankable assets. These internal risk ratings are reviewed routinely and adjusted based on changes in the borrowers’ financial status and the loans’ collectability.

The following tables present the credit risk ratings for non-PCI loans by portfolio segment as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total Non-PCI Loans
Commercial lending:
C&I	$	10,464,618	$	164,161	$	150,565	$	27,918	$	10,807,262
CRE	8,614,575		41,942		106,393		—		8,762,910
Multifamily residential	1,884,434		—		14,083		—		1,898,517
Construction and land	614,481		684		54,131		—		669,296
Total commercial lending	21,578,108		206,787		325,172		27,918		22,137,985
Consumer lending:
Single-family residential	4,803,472		7,563		7,059		—		4,818,094
HELOCs	1,753,398		2,451		6,937		—		1,762,786
Other consumer	381,487		2		2,491		—		383,980
Total consumer lending	6,938,357		10,016		16,487		—		6,964,860
Total	$	28,516,465	$	216,803	$	341,659	$	27,918	$	29,102,845




($ in thousands)	December 31, 2017
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total Non-PCI Loans
Commercial lending:
C&I	$	10,369,516	$	114,769	$	180,269	$	20,882	$	10,685,436
CRE	8,484,635		65,616		108,958		—		8,659,209
Multifamily residential	1,839,958		—		15,170		—		1,855,128
Construction and land	614,441		4,590		40,295		—		659,326
Total commercial lending	21,308,550		184,975		344,692		20,882		21,859,099
Consumer lending:
Single-family residential	4,490,672		16,504		21,735		—		4,528,911
HELOCs	1,744,903		11,900		12,114		—		1,768,917
Other consumer	333,895		111		2,498		—		336,504
Total consumer lending	6,569,470		28,515		36,347		—		6,634,332
Total	$	27,878,020	$	213,490	$	381,039	$	20,882	$	28,493,431

The following tables present the credit risk ratings for PCI loans by portfolio segment as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total PCI Loans
Commercial lending:
C&I	$	10,071	$	23	$	948	$	—	$	11,042
CRE	219,255		2,525		38,056		—		259,836
Multifamily residential	52,426		—		3,912		—		56,338
Construction and land	44		—		—		—		44
Total commercial lending	281,796		2,548		42,916		—		327,260
Consumer lending:
Single-family residential	111,567		748		171		—		112,486
HELOCs	12,435		212		10		—		12,657
Total consumer lending	124,002		960		181		—		125,143
Total ⁽¹⁾	$	405,798	$	3,508	$	43,097	$	—	$	452,403




($ in thousands)	December 31, 2017
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total PCI Loans
Commercial lending:
C&I	$	10,712	$	57	$	1,026	$	—	$	11,795
CRE	238,605		531		38,552		—		277,688
Multifamily residential	56,720		—		4,328		—		61,048
Construction and land	44		—		327		—		371
Total commercial lending	306,081		588		44,233		—		350,902
Consumer lending:
Single-family residential	113,905		1,543		1,930		—		117,378
HELOCs	12,642		—		1,365		—		14,007
Total consumer lending	126,547		1,543		3,295		—		131,385
Total ⁽¹⁾	$	432,628	$	2,131	$	47,528	$	—	$	482,287


(1)	Loans net of ASC 310-30 discount.

Nonaccrual and Past Due Loans

Non-PCI loans that are 90 or more days past due are generally placed on nonaccrual status, unless the loan is well-collateralized or guaranteed by government agencies, and in the process of collection. Non-PCI loans that are less than 90 days past due but have identified deficiencies, such as when the full collection of principal or interest becomes uncertain, are also placed on nonaccrual status. The following tables present the aging analysis on non-PCI loans as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Accruing Loans 30-59 Days Past Due		Accruing Loans 60-89 Days Past Due		Accruing Loans 90 or More Days Past Due		Total Accruing Past Due Loans		Nonaccrual Loans Less Than 90 Days Past Due		Nonaccrual Loans 90 or More Days Past Due		Total Nonaccrual Loans		Current Accruing Loans		Total Non-PCI Loans
Commercial lending:
C&I	$	16,767	$	1,649	$	2,381	$	20,797	$	38,609	$	42,198	$	80,807	$	10,705,658	$	10,807,262
CRE	6,872		2,095		—		8,967		5,321		21,175		26,496		8,727,447		8,762,910
Multifamily residential	2,958		14		—		2,972		1,000		1,050		2,050		1,893,495		1,898,517
Construction and land	1,804		—		—		1,804		—		3,973		3,973		663,519		669,296
Total commercial lending	28,401		3,758		2,381		34,540		44,930		68,396		113,326		21,990,119		22,137,985
Consumer lending:
Single-family residential	8,230		7,733		—		15,963		6		7,459		7,465		4,794,666		4,818,094
HELOCs	4,421		2,369		—		6,790		26		6,909		6,935		1,749,061		1,762,786
Other consumer	24		2		—		26		—		2,491		2,491		381,463		383,980
Total consumer lending	12,675		10,104		—		22,779		32		16,859		16,891		6,925,190		6,964,860
Total	$	41,076	$	13,862	$	2,381	$	57,319	$	44,962	$	85,255	$	130,217	$	28,915,309	$	29,102,845




($ in thousands)	December 31, 2017
($ in thousands)	Accruing Loans 30-59 Days Past Due		Accruing Loans 60-89 Days Past Due		Accruing Loans 90 or More Days Past Due		Total Accruing Past Due Loans		Nonaccrual Loans Less Than 90 Days Past Due		Nonaccrual Loans 90 or More Days Past Due		Total Nonaccrual Loans		Current Accruing Loans		Total Non-PCI Loans
Commercial lending:
C&I	$	30,964	$	82	$	—	$	31,046	$	27,408	$	41,805	$	69,213	$	10,585,177	$	10,685,436
CRE	3,414		466		—		3,880		5,430		21,556		26,986		8,628,343		8,659,209
Multifamily residential	4,846		14		—		4,860		1,418		299		1,717		1,848,551		1,855,128
Construction and land	758		—		—		758		—		3,973		3,973		654,595		659,326
Total commercial lending	39,982		562		—		40,544		34,256		67,633		101,889		21,716,666		21,859,099
Consumer lending:
Single-family residential	13,269		5,355		—		18,624		6		5,917		5,923		4,504,364		4,528,911
HELOCs	4,286		4,186		—		8,472		89		3,917		4,006		1,756,439		1,768,917
Other consumer	14		23		—		37		—		2,491		2,491		333,976		336,504
Total consumer lending	17,569		9,564		—		27,133		95		12,325		12,420		6,594,779		6,634,332
Total	$	57,551	$	10,126	$	—	$	67,677	$	34,351	$	79,958	$	114,309	$	28,311,445	$	28,493,431

For information on the policy for recording payments received and resuming accrual of interest on non-PCI loans that are placed on nonaccrual status, see Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2017 Form 10-K.

PCI loans are excluded from the above aging analysis tables as the Company has elected to account for these loans on a pool level basis under ASC 310-30 at the time of acquisition. Refer to the discussion on PCI loans within this note for additional details on interest income recognition. As of March 31, 2018 and December 31, 2017, PCI loans on nonaccrual status totaled $5.2 million and $5.3 million, respectively.

Loans in Process of Foreclosure

As of March 31, 2018 and December 31, 2017, residential and consumer mortgage loans of $8.3 million and $6.6 million, respectively, were secured by residential real estate properties, for which formal foreclosure proceedings were in process according to local requirements of the applicable jurisdictions. As of March 31, 2018, there were no foreclosed residential real estate properties included in total net OREO of $734 thousand. In comparison, a foreclosed residential real estate property with a carrying amount of $188 thousand was included in total net OREO of $830 thousand as of December 31, 2017.

Troubled Debt Restructurings

Potential troubled debt restructurings (“TDRs”) are individually evaluated and the type of restructuring is selected based on the loan type and the circumstances of the borrower’s financial difficulty. A TDR is a modification of the terms of a loan when the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower that it would not have otherwise considered.

There were no non-PCI TDR additions during the three months ended March 31, 2018. The following table presents the additions to non-PCI TDRs for the three months ended March 31, 2017:




($ in thousands)	Number of Loans	Pre- Modification Outstanding Recorded Investment		Post- Modification Outstanding Recorded Investment ⁽¹⁾		Financial Impact ⁽²⁾
Commercial lending:
C&I	2	$	6,448	$	4,914	$	1,273
CRE	1	1,526		1,505		—
Construction and land	2	86		—		—
Total	5	$	8,060	$	6,419	$	1,273


(1)	Includes subsequent payments after modification and reflects the balance as of March 31, 2017.


(2)	The financial impact includes charge-offs and specific reserves recorded at the modification date.

There were no non-PCI TDR modifications during the three months ended March 31, 2018. The following table presents the non-PCI TDR modifications for the three months ended March 31, 2017 by modification type:




($ in thousands)	Principal ⁽¹⁾		Principal and Interest ⁽²⁾		Total
Commercial lending:
C&I	$	—	$	4,914	$	4,914
CRE	1,505		—		1,505
Total	$	1,505	$	4,914	$	6,419


(1)	Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only.


(2)	Includes principal and interest deferments or reductions.

Subsequent to restructuring, a TDR that becomes delinquent, generally beyond 90 days, is considered to have defaulted. As TDRs are individually evaluated for impairment under the specific reserve methodology, subsequent defaults do not generally have a significant additional impact on the allowance for loan losses. The following table presents information on loans modified as TDRs within the previous 12 months that have subsequently defaulted during the three months ended March 31, 2018 and 2017, and were still in default at the respective period end:




($ in thousands)	Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended March 31,
	2018			2017
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
Commercial lending:
C&I	—	$	—	1	$	2,718
Consumer lending:
HELOCs	1	$	155	—	$	—

The amount of additional funds committed to lend to borrowers whose terms have been modified was $2.0 million and $5.1 million as of March 31, 2018 and December 31, 2017, respectively.

Impaired Loans

The following tables present information on non-PCI impaired loans as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Unpaid Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Commercial lending:
C&I	$	123,336	$	43,192	$	55,789	$	98,981	$	28,564
CRE	40,935		27,210		7,706		34,916		615
Multifamily residential	9,819		6,483		2,934		9,417		103
Construction and land	4,691		3,973		—		3,973		—
Total commercial lending	178,781		80,858		66,429		147,287		29,282
Consumer lending:
Single-family residential	16,983		2,600		13,219		15,819		541
HELOCs	8,277		4,774		3,360		8,134		5
Other consumer	2,491		—		2,491		2,491		2,491
Total consumer lending	27,751		7,374		19,070		26,444		3,037
Total non-PCI impaired loans	$	206,532	$	88,232	$	85,499	$	173,731	$	32,319




($ in thousands)	December 31, 2017
($ in thousands)	Unpaid Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Commercial lending:
C&I	$	130,773	$	36,086	$	62,599	$	98,685	$	16,094
CRE	41,248		28,699		6,857		35,556		684
Multifamily residential	11,164		8,019		2,617		10,636		88
Construction and land	4,781		3,973		—		3,973		—
Total commercial lending	187,966		76,777		72,073		148,850		16,866
Consumer lending:
Single-family residential	15,501		—		14,338		14,338		534
HELOCs	5,484		2,287		2,921		5,208		4
Other consumer	2,491		—		2,491		2,491		2,491
Total consumer lending	23,476		2,287		19,750		22,037		3,029
Total non-PCI impaired loans	$	211,442	$	79,064	$	91,823	$	170,887	$	19,895

The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
	2018				2017
	Average Recorded Investment		Recognized Interest Income ⁽¹⁾		Average Recorded Investment		Recognized Interest Income ⁽¹⁾
Commercial lending:
C&I	$	99,457	$	1,900	$	143,214	$	221
CRE	35,166		868		44,772		35
Multifamily residential	9,458		116		9,269		38
Construction and land	3,973		69		4,717		—
Total commercial lending	148,054		2,953		201,972		294
Consumer lending:
Single-family residential	15,628		206		15,096		22
HELOCs	8,141		111		4,532		12
Other consumer	2,491		45		1		—
Total consumer lending	26,260		362		19,629		34
Total non-PCI impaired loans	$	174,314	$	3,315	$	221,601	$	328


(1)	Includes interest recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income.

Allowance for Credit Losses

The following table presents a summary of activities in the allowance for loan losses by portfolio segment for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018			2017
Non-PCI Loans
Allowance for non-PCI loans, beginning of period	$	287,070		$	260,402
Provision for loan losses on non-PCI loans	19,933			8,046
Gross charge-offs:
Commercial lending:
C&I	(18,445		)	(7,057		)
Construction and land	—			(148		)
Consumer lending:
Single-family residential	(1		)	—
Other consumer	(17		)	(4		)
Total gross charge-offs	(18,463		)	(7,209		)
Gross recoveries:
Commercial lending:
C&I	7,687			455
CRE	427			569
Multifamily residential	333			567
Construction and land	435			24
Consumer lending:
Single-family residential	184			11
HELOCs	—			24
Other consumer	1			118
Total gross recoveries	9,067			1,768
Net charge-offs	(9,396		)	(5,441		)
Allowance for non-PCI loans, end of period	297,607			263,007

PCI Loans
Allowance for PCI loans, beginning of period	58			118
Reversal of loan losses on PCI loans	(11		)	(31		)
Allowance for PCI loans, end of period	47			87
Allowance for loan losses	$	297,654		$	263,094

For further information on accounting policies and the methodologies used to estimate the allowance for credit losses and loan charge-offs, see Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2017 Form 10-K.

The following table presents a summary of activities in the allowance for unfunded credit reserves for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Allowance for unfunded credit reserves, beginning of period	$	13,318	$	16,121
Provision for (reversal of) unfunded credit reserves	296		(947		)
Allowance for unfunded credit reserves, end of period	$	13,614	$	15,174

The allowance for unfunded credit reserves is maintained at a level management believes to be sufficient to absorb estimated probable losses related to unfunded credit facilities. The allowance for unfunded credit reserves is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. See Note 11 — Commitments and Contingencies to the Consolidated Financial Statements for additional information related to unfunded credit reserves.

The following tables present the Company’s allowance for loan losses and recorded investments by portfolio segment and impairment methodology as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
	Commercial Lending								Consumer Lending
	C&I		CRE		Multifamily Residential		Construction and Land		Single- Family Residential		HELOCs		Other Consumer		Total
Allowance for loan losses
Individually evaluated for impairment	$	28,564	$	615	$	103	$	—	$	541	$	5	$	2,491	$	32,319
Collectively evaluated for impairment	141,131		39,056		18,396		32,220		25,416		7,036		2,033		265,288
Acquired with deteriorated credit quality	—		47		—		—		—		—		—		47
Total	$	169,695	$	39,718	$	18,499	$	32,220	$	25,957	$	7,041	$	4,524	$	297,654

Recorded investment in loans
Individually evaluated for impairment	$	98,981	$	34,916	$	9,417	$	3,973	$	15,819	$	8,134	$	2,491	$	173,731
Collectively evaluated for impairment	10,708,281		8,727,994		1,889,100		665,323		4,802,275		1,754,652		381,489		28,929,114
Acquired with deteriorated credit quality ⁽¹⁾	11,042		259,836		56,338		44		112,486		12,657		—		452,403
Total ⁽¹⁾	$	10,818,304	$	9,022,746	$	1,954,855	$	669,340	$	4,930,580	$	1,775,443	$	383,980	$	29,555,248




($ in thousands)	December 31, 2017
	Commercial Lending								Consumer Lending
	C&I		CRE		Multifamily Residential		Construction and Land		Single- Family Residential		HELOCs		Other Consumer		Total
Allowance for loan losses
Individually evaluated for impairment	$	16,094	$	684	$	88	$	—	$	534	$	4	$	2,491	$	19,895
Collectively evaluated for impairment	146,964		40,495		19,021		26,881		25,828		7,350		636		267,175
Acquired with deteriorated credit quality	—		58		—		—		—		—		—		58
Total	$	163,058	$	41,237	$	19,109	$	26,881	$	26,362	$	7,354	$	3,127	$	287,128

Recorded investment in loans
Individually evaluated for impairment	$	98,685	$	35,556	$	10,636	$	3,973	$	14,338	$	5,208	$	2,491	$	170,887
Collectively evaluated for impairment	10,586,751		8,623,653		1,844,492		655,353		4,514,573		1,763,709		334,013		28,322,544
Acquired with deteriorated credit quality ⁽¹⁾	11,795		277,688		61,048		371		117,378		14,007		—		482,287
Total ⁽¹⁾	$	10,697,231	$	8,936,897	$	1,916,176	$	659,697	$	4,646,289	$	1,782,924	$	336,504	$	28,975,718


(1)	Loans net of ASC 310-30 discount.

Purchased Credit Impaired Loans

At the date of acquisition, PCI loans are pooled and accounted for at fair value, which represents the discounted value of the expected cash flows of the loan portfolio. A pool is accounted for as a single asset with a single interest rate, cumulative loss rate and cash flows expectation. The cash flows expected over the life of the pools are estimated by an internal cash flows model that projects cash flows and calculates the carrying values of the pools, book yields, effective interest income and impairment, if any, based on pool level events. Assumptions as to cumulative loss rates, loss curves and prepayment speeds are utilized to calculate the expected cash flows. The amount of expected cash flows over the initial investment in the loan represents the “accretable yield,” which is recognized as interest income on a level yield basis over the life of the loan. Prepayments affect the estimated life of PCI loans, which may change the amount of interest income, and possibly principal, expected to be collected. The excess of total contractual cash flows over the cash flows expected to be received at origination is deemed to be the “nonaccretable difference.”

The following table presents the changes in accretable yield for PCI loans for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018			2017
Accretable yield for PCI loans, beginning of period	$	101,977		$	136,247
Accretion	(9,134		)	(10,279		)
Changes in expected cash flows	3,021			2,022
Accretable yield for PCI loans, end of period	$	95,864		$	127,990

Loans Held-for-Sale

As of March 31, 2018, loans held-for-sale of $46.2 million were comprised of C&I and single-family residential loans. In comparison, as of December 31, 2017, loans held-for-sale of $85 thousand were comprised of single-family residential loans. Loans held-for-sale are carried at the lower of cost or fair value. When a determination is made at the time of commitment to originate or purchase loans as held-for-investment, it is the Company’s intent to hold these loans to maturity or for the “foreseeable future,” subject to periodic reviews under the Company’s management evaluation processes, including asset/liability management and credit risk management. When the Company subsequently changes its intent to hold certain loans, the loans are transferred from held-for-investment to held-for-sale at the lower of cost or fair value. From time to time, the Company purchases and sells loans in the secondary market. Certain purchased loans are transferred from held-for-investment to held-for-sale; and write-downs to allowance for loan losses are recorded, when appropriate.

The following tables present information on the loans transferred from held-for-investment to held-for-sale, and sales and purchases of loans, during the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31, 2018
	Commercial Lending						Consumer Lending
	C&I		CRE		Multifamily Residential		Single-Family Residential		Other Consumer		Total
Loans transferred from held-for-investment to held-for-sale	$	146,391	$	9,376	$	—	$	—	$	—	$	155,767	⁽¹⁾
Sales	$	102,365	$	9,376	$	—	$	2,546	$	—	$	114,287	^(2)(3)(4)
Purchases	$	64,747	$	—	$	186	$	15,113	$	—	$	80,046	⁽⁵⁾




($ in thousands)	Three Months Ended March 31, 2017
	Commercial Lending						Consumer Lending
	C&I		CRE		Multifamily Residential		Single-Family Residential		Other Consumer		Total
Loans transferred from held-for-investment to held-for-sale	$	265,259	$	12,765	$	—	$	—	$	—	$	278,024	⁽¹⁾
Sales	$	236,679	$	12,765	$	—	$	4,310	$	22,191	$	275,945	^(2)(3)(4)
Purchases	$	147,116	$	—	$	126	$	—	$	—	$	147,242	⁽⁵⁾


(1)	The Company recorded $85 thousand and $92 thousand in write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for the three months ended March 31, 2018 and 2017, respectively.


(2)	Includes originated loans sold of $89.7 million and $29.3 million for the three months ended March 31, 2018 and 2017, respectively. Originated loans sold were primarily comprised of C&I and CRE loans for each of the three months ended March 31, 2018, and 2017.


(3)	Includes purchased loans sold in the secondary market of $24.6 million and $246.6 million for the three months ended March 31, 2018 and 2017, respectively.

(4)

Net gains on sales of loans, excluding the lower of cost or fair value adjustments, were $1.6 million and $2.8 million for the three months ended March 31, 2018 and 2017, respectively. No lower of cost or fair value adjustments were recorded for the three months ended March 31, 2018. In comparison, the lower of cost or fair value adjustment of $69 thousand was recorded in Net gains on sales of loans on the Consolidated Statement of Income for the three months ended March 31, 2017.


(5)	C&I loan purchases for each of the three months ended March 31, 2018 and 2017 mainly represent C&I syndicated loans.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net

3 Months Ended

Mar. 31, 2018

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net

The Community Reinvestment Act (“CRA”) encourages banks to meet the credit needs of their communities for housing and other purposes, particularly in low or moderate income neighborhoods. The Company invests in certain affordable housing limited partnerships that qualify for CRA credits. Such limited partnerships are formed to develop and operate apartment complexes designed as high-quality affordable housing for lower income tenants throughout the U.S. Each of the partnerships must meet the regulatory requirements for affordable housing for a minimum 15-year compliance period to fully utilize the tax credits. In addition to affordable housing limited partnerships, the Company invests in new market tax credit projects that qualify for CRA credits and eligible projects that qualify for renewable energy and historic tax credits. Investments in renewable energy tax credits help promote the development of renewable energy sources, while the investments in historic tax credits promote the rehabilitation of historic buildings and economic revitalization of the surrounding areas.

Investments in Qualified Affordable Housing Partnerships, Net

The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income.

The following table presents the balances of the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018		December 31, 2017
Investments in qualified affordable housing partnerships, net	$	160,574	$	162,824
Accrued expenses and other liabilities — Unfunded commitments	$	54,801	$	55,815

The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Tax credits and other tax benefits recognized	$	9,155	$	9,621
Amortization expense included in income tax expense	$	7,073	$	6,950

Investments in Tax Credit and Other Investments, Net

Investments in tax credit and other investments, net, were $246.2 million and $224.6 million as of March 31, 2018 and December 31, 2017, respectively. As a result of the adoption of ASU 2016-01 in the first quarter of 2018, $31.0 million of equity securities with readily determinable fair values were included in Investments in tax credit and other investments, net, on the Consolidated Balance Sheet as of March 31, 2018. These equity securities are CRA investments and were measured at fair value with changes in fair value recorded through net income. The unrealized losses recognized during the three months ended March 31, 2018 on these equity securities totaled $454 thousand.

The Company is not the primary beneficiary of the investments in tax credit and other investments and, therefore, is not required to consolidate these investments on the Consolidated Financial Statements. Depending on the ownership percentage and the influence the Company has on the investments in tax credit and other investments, the Company applies the equity or cost method of accounting, or the measurement alternative as elected under ASU 2016-01 for equity investments without readily determinable fair value.

Total unfunded commitments for these investments were $107.8 million and $113.4 million as of March 31, 2018 and December 31, 2017, respectively, and are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Amortization of tax credit and other investments was $17.4 million and $14.4 million for the three months ended March 31, 2018 and 2017, respectively.

Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill

Total goodwill was $465.5 million and $469.4 million as of March 31, 2018 and December 31, 2017, respectively. The $3.9 million decrease in goodwill was due to the sale of the Bank’s DCB branches in March 2018, for which the associated allocated goodwill was written off. Goodwill is tested for impairment on an annual basis as of December 31, or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s three operating segments, Retail Banking, Commercial Banking and Other, are equivalent to the Company’s reporting units. For complete discussion and disclosure, see Note 16 — Business Segments to the Consolidated Financial Statements.

Impairment Analysis

The Company performed its annual impairment analysis as of December 31, 2017 and concluded that there was no goodwill impairment as the fair value of all reporting units exceeded their respective carrying value. There were no triggering events during the three months ended March 31, 2018 and therefore, no additional goodwill impairment analysis was performed. No assurance can be given that goodwill will not be written down in future periods. Refer to Note 9 — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2017 Form 10-K for additional details related to the Company’s annual goodwill impairment analysis.

Core Deposit Intangibles

Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant. Core deposit intangibles associated with the sale of the Bank’s DCB branches with a net carrying value of $1.0 million were written off. There were no impairment write-downs on the remaining core deposit intangibles for each of the three months ended March 31, 2018 and 2017.

The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018			December 31, 2017
Gross balance ⁽¹⁾	$	86,099		$	100,166
Accumulated amortization ⁽¹⁾	(67,562		)	(79,112		)
Net carrying balance	$	18,537		$	21,054


(1)	Excludes fully amortized core deposit intangible assets.

Amortization Expense

The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the core deposit intangible assets was $1.5 million and $1.8 million for the three months ended March 31, 2018 and 2017, respectively.

The following table presents the estimated future amortization expense of core deposit intangibles as of March 31, 2018:




Year Ended December 31,	Amount ($ in thousands)
Remainder of 2018	$	4,008
2019	4,518
2020	3,634
2021	2,749
2022	1,865
Thereafter	1,763
Total	$	18,537

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Credit Extensions — In the normal course of business, the Company has various outstanding commitments to extend credit that are not reflected in the accompanying Consolidated Financial Statements. While the Company does not anticipate losses as a result of these transactions, commitments to extend credit are included in determining the appropriate level of the allowance for unfunded commitments, and outstanding commercial and standby letters of credit (“SBLCs”).

The following table presents the Company’s credit-related commitments as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018		December 31, 2017
Loan commitments	$	4,818,815	$	5,075,480
Commercial letters of credit and SBLCs	$	1,632,585	$	1,655,897

Loan commitments are agreements to lend to a customer provided that there are no violations of any conditions established in the agreement. Commitments generally have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future funding requirements.

Commercial letters of credit are issued to facilitate domestic and foreign trade transactions, while SBLCs are generally contingent upon the failure of the customers to perform according to the terms of the underlying contract with the third party. As a result, the total contractual amounts do not necessarily represent future funding requirements. The Company’s historical experience is that SBLCs typically expire without being funded. Additionally, in many cases, the Company holds collateral in various forms against these SBLCs. As part of its risk management activities, the Company monitors the creditworthiness of customers in conjunction with its SBLC exposure. Customers are obligated to reimburse the Company for any payment made on the customers’ behalf. If the customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. As of March 31, 2018, total letters of credit, which amounted to $1.63 billion, were comprised of SBLCs of $1.57 billion and commercial letters of credit of $60.5 million.

The Company uses the same credit underwriting criteria in extending loans, commitments and conditional obligations to customers. Each customer’s creditworthiness is evaluated on a case-by-case basis. Collateral and financial guarantees may be obtained based on management’s assessment of the customer’s credit. Collateral may include cash, accounts receivable, inventory, property, plant and equipment, and income-producing commercial property.

Estimated exposure to loss from these commitments is included in the allowance for unfunded credit reserves, and amounted to $13.4 million as of March 31, 2018 and $12.7 million as of December 31, 2017. These amounts are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

Guarantees — The Company has sold or securitized loans with recourse in the ordinary course of business. The recourse component in the loans sold or securitized with recourse is considered a guarantee. As the guarantor, the Company is obligated to repurchase up to the recourse component of the loans when the loans default. The unpaid principal balance of total single-family and multifamily residential loans sold or securitized with recourse amounted to $108.7 million and $113.7 million as of March 31, 2018 and December 31, 2017, respectively. The maximum potential future payments up to the recourse component that the Company is obligated to repurchase amounted to $37.8 million and $38.7 million as of March 31, 2018 and December 31, 2017, respectively. The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit reserves and totaled $200 thousand and $214 thousand as of March 31, 2018 and December 31, 2017, respectively. The allowance for unfunded credit reserves is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. The Company continues to experience minimal losses from the single-family and multifamily residential loan portfolios sold or securitized with recourse.

Litigation — The Company is a party to various legal actions arising in the course of its business. In accordance with ASC 450, Contingencies, the Company accrues reserves for outstanding lawsuits, claims and proceedings when a loss contingency is probable and can be reasonably estimated. The Company estimates the amount of loss contingencies using current available information from legal proceedings, advice from legal counsel, and available insurance coverage. Due to the inherent subjectivity of the assessments and unpredictability of the outcomes of the legal proceedings, any amounts accrued or included in this aggregate amount may not represent the ultimate loss to the Company from the legal proceedings in question. Thus, the Company’s exposure and ultimate losses may be higher, and possibly significantly more than the amounts accrued.

Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships, tax credit and other investments as discussed in Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements. As of March 31, 2018 and December 31, 2017, these commitments were $162.6 million and $169.2 million, respectively. These commitments are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

On January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers - Topic 606 and all subsequent ASUs that modified ASC 606, Revenue from Contracts with Customers. The Company adopted ASC 606 using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. The new standard did not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s existing accounting for contracts within the scope of the new standard. There was no cumulative effect adjustment to retained earnings as a result of adopting this new standard.

The following table presents revenue from contracts with customers within the scope of ASC 606 and other noninterest income, segregated by operating segments for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31, 2018
($ in thousands)	Retail Banking		Commercial Banking		Other		Total
Noninterest income:
Revenue from contracts with customers ⁽¹⁾:
Branch fees:
Deposit service charges and related fee income	$	6,014	$	3,014	$	158	$	9,186
Card income	1,070		174		—		1,244
Wealth management fees	2,796		157		—		2,953
Total revenue from contracts with customers	$	9,880	$	3,345	$	158	$	13,383
Other sources of noninterest income ⁽²⁾	34,568		24,093		2,400		61,061
Total noninterest income	$	44,448	$	27,438	$	2,558	$	74,444




($ in thousands)	Three Months Ended March 31, 2017
($ in thousands)	Retail Banking		Commercial Banking		Other		Total
Noninterest income:
Revenue from contracts with customers ⁽¹⁾:
Branch fees:
Deposit service charges and related fee income	$	5,837	$	2,742	$	105	$	8,684
Card income	1,027		213		—		1,240
Wealth management fees	3,246		1,089		—		4,335
Total revenue from contracts with customers	$	10,110	$	4,044	$	105	$	14,259
Other sources of noninterest income ⁽²⁾	3,454		21,690		76,425		101,569
Total noninterest income	$	13,564	$	25,734	$	76,530	$	115,828


(1)	There were no adjustments to the Company’s financial statements recorded as a result of the adoption of ASC 606. For comparability, the Company has adjusted prior period amounts to conform to the current period’s presentation.


(2)	Primarily represents revenue from contracts with customers that are out of the scope of ASC 606.

Generally, the Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered. The Company generally records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services to customers and records contract assets when services are provided to customers before payment is received or before payment is due. Since the Company receives payments for its services during the period or at the time services are provided, there are no contract asset or receivable balances as of March 31, 2018 and December 31, 2017.

The major revenue streams by fee type that are within the scope of ASC 606 presented in the above tables are described in additional detail below:

Branch Fees — Deposit Service Charges and Related Fee Income

The Company offers a range of deposit products to individuals and businesses, which includes savings, money market, checking and time deposit accounts. The deposit account services include ongoing account maintenance, certain optional services, including banking services (e.g., automated teller machines, wire transfer services, and check orders), as well as treasury management and business account analysis services that are offered to business deposit customers. The Company may charge a fixed monthly account maintenance fee if certain average balances are not maintained, therefore making the fee variable. Additionally, each time a deposit customer selects an optional service, the Company may earn transactional fees. For arrangements where the Company charges ongoing account maintenance fees, it recognizes those fees each month the customer maintains its deposit account. When the customer selects an optional service, the Company generally recognizes the fee at the point in time when the transaction occurs. For business analysis accounts, business deposit customers receive an earnings credit based on their account balance which can be used to offset the cost of banking and treasury management services. Business analysis accounts that are assessed fees in excess of earnings credits received are typically charged at the end of each month after all transactions are known and the credits are calculated.

Branch Fees — Card Income

Card income is comprised of merchant referral fees and interchange income. For merchant referral fees, the Company provides marketing and referral services to acquiring banks for merchant card processing services and earns variable referral fees based on transaction activity. The Company satisfies its performance obligation over time as the Company identifies, solicits, and refers business customers who are provided such services. The Company receives monthly fees net of consideration it pays to the acquiring bank performing the merchant card processing services. The Company recognizes revenue on a monthly basis when the uncertainty associated with the variable referral fees is resolved at the time the Company receives monthly statements from the acquiring bank. For interchange income, the Company as a card issuer, has a stand ready performance obligation to authorize, clear, and settle card transactions. The Company earns, or pays, interchange fees which is a percentage-based fee on each transaction based on rates published by the corresponding payment network rates for transactions on their network. The Company measures its progress toward the satisfaction of its performance obligation over time, as services are rendered, and the Company provides continuous access to this service and settles transactions as its customer, the payment network, requires. Interchange income is presented net of direct costs paid to the customer and entities in their distribution chain, which are transaction based expenses such as rewards program expenses and certain network costs. Revenue is recognized when the net profit is determined by the payment networks at the end of each day.

Wealth Management Fees

The Company employs financial consultants to provide investment planning services for customers including wealth management services, asset allocation strategies, portfolio analysis and monitoring, investment strategies, and risk management strategies. The fees the Company earns are variable and are generally received monthly. The Company recognizes revenue for the services performed at quarter end based on actual transaction details received from the broker dealer the Company engages.

Practical Expedients and Exemptions

The Company applies the practical expedient in ASC 606-10-50-14 and does not disclose the value of unsatisfied performance obligations as the Company’s contracts with customers generally have a term that is less than one year, are open-ended with a cancellation period that is less than one year, or allow the Company to recognize revenue in the amount to which the Company has the right to invoice.

In addition, given the short term nature of the contracts, the Company also applies the practical expedient in ASC 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component, if at contract inception the period between when the entity transfers the goods or services and when the customer pays for that good or service is one year or less.

Stock Compensation Plans

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Compensation Plans

Pursuant to the Company’s 2016 Stock Incentive Plan, as amended, the Company may issue stock options, restricted stock awards (“RSAs”), restricted stock units (“RSUs”), stock appreciation rights, stock purchase warrants, phantom stock and dividend equivalents to certain employees and non-employee directors of the Company and its subsidiaries. There were no outstanding stock options or unvested RSAs as of March 31, 2018 and 2017.

RSUs are granted under the Company’s long-term incentive plan at no cost to the recipient. RSUs vest ratably over three years or cliff vest after three or five years of continued employment from the date of the grant. RSUs entitle the recipient to receive cash dividends equivalent to any dividends paid on the underlying common stock during the period the RSUs are outstanding. RSU dividends are accrued during the vesting period and are paid at the time of vesting. While a portion of RSUs are time-vesting awards, others vest subject to the attainment of specified performance goals referred to as “Performance-based RSUs.” All RSUs are subject to forfeiture until vested.

Performance-based RSUs are granted at the target amount of awards. Based on the Company’s attainment of specified performance goals and consideration of market conditions, the number of shares that vest can be adjusted to a minimum of zero and to a maximum of 200% of the target. The amount of performance-based RSUs that are eligible to vest is determined at the end of each performance period and is then added together to determine the total number of performance shares that are eligible to vest. Performance-based RSUs cliff vest three years from the date of grant.

Compensation costs for the time-based awards are based on the quoted market price of the Company’s stock at the grant date. Compensation costs associated with performance-based RSUs are based on grant date fair value which considers both market and performance conditions, and is subject to subsequent adjustments based on the changes in the Company’s stock price and the projected outcome of the performance criteria. Compensation costs of both time-based and performance-based awards are recognized on a straight-line basis from the grant date until the vesting date of each grant.

The following table presents a summary of the total share-based compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Stock compensation costs	$	6,158	$	5,151
Related net tax benefits for stock compensation plans	$	4,778	$	4,414

The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the three months ended March 31, 2018 based on the target amount of awards:




	Three Months Ended March 31, 2018
	Time-Based RSUs				Performance-Based RSUs
	Shares		Weighted-Average Grant Date Fair Value		Shares		Weighted-Average Grant Date Fair Value
Outstanding, at beginning of period	1,166,580		$	42.00	424,299		$	41.44
Granted	389,667		67.32		120,286		70.13
Vested	(312,413	)	39.97		(133,295	)	41.15
Forfeited	(29,223	)	44.62		—		—
Outstanding, at end of period	1,214,611		$	50.58	411,290		$	49.93

As of March 31, 2018, total unrecognized compensation costs related to time-based and performance-based RSUs amounted to $46.8 million and $26.0 million, respectively. These costs are expected to be recognized over a weighted-average period of 2.44 years and 2.37 years for time-based and performance-based RSUs, respectively.

Stockholders' Equity and Earnings Per Share

3 Months Ended

Mar. 31, 2018

Stockholders' Equity and Earnings Per Share [Abstract]

Stockholders' Equity and Earnings Per Share

Stockholders’ Equity and Earnings Per Share

Warrant — The Company acquired MetroCorp Bancshares, Inc., (“MetroCorp”) on January 17, 2014. Prior to the acquisition, MetroCorp had an outstanding warrant to purchase 771,429 shares of its common stock. Upon the acquisition, the rights of the warrant holder were converted into the right to acquire 230,282 shares of East West’s common stock until January 16, 2019. The warrant has not been exercised as of March 31, 2018.

Earnings Per Share — Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during each period, plus common share equivalents calculated for warrants and RSUs outstanding using the treasury stock method.

The following table presents the EPS calculations for the three months ended March 31, 2018 and 2017:




($ and shares in thousands, except per share data)	Three Months Ended March 31,
($ and shares in thousands, except per share data)	2018		2017
Basic
Net income	$	187,032	$	169,736

Basic weighted-average number of shares outstanding	144,664		144,249
Basic EPS	$	1.29	$	1.18

Diluted
Net income	$	187,032	$	169,736

Basic weighted-average number of shares outstanding	144,664		144,249
Diluted potential common shares ⁽¹⁾	1,275		1,483
Diluted weighted-average number of shares outstanding	145,939		145,732
Diluted EPS	$	1.28	$	1.16


(1)	Includes dilutive shares from RSUs and warrants for the three months ended March 31, 2018 and 2017.

For the three months ended March 31, 2018 and 2017, 177,807 and 193,916 weighted-average anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation.

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

The following table presents the changes in the components of AOCI balances for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
	2018									2017
	Available- for-Sale Investment Securities			Foreign Currency Translation Adjustments ⁽¹⁾			Total			Available- for-Sale Investment Securities			Foreign Currency Translation Adjustments ⁽¹⁾			Total
Beginning balance	$	(30,898	)	$	(6,621	)	$	(37,519	)	$	(28,772	)	$	(19,374	)	$	(48,146	)
Cumulative effect of change in accounting principle related to marketable equity securities⁽²⁾	385			—			385			—			—			—
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate⁽³⁾	(6,656		)	—			(6,656		)	—			—			—
Net unrealized (losses) gains arising during the period	(17,311		)	6,798			(10,513		)	5,055			1,007			6,062
Amounts reclassified from AOCI	(1,501		)	—			(1,501		)	(1,434		)	—			(1,434		)
Changes, net of taxes	(18,812		)	6,798			(12,014		)	3,621			1,007			4,628
Ending balance	$	(55,981	)	$	177		$	(55,804	)	$	(25,151	)	$	(18,367	)	$	(43,518	)


(1)	Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was Chinese Renminbi and USD, respectively.


(2)	Represents the impact of the adoption in the first quarter of 2018 of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.


(3)	Represents amounts reclassified from AOCI to retained earnings due to early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

The following table presents the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
	2018								2017
	Before-Tax			Tax Effect		Net-of-Tax			Before-Tax			Tax Effect			Net-of-Tax
Available-for-sale investment securities:
Net unrealized (losses) gains arising during the period	$	(24,577	)	$	7,266	$	(17,311	)	$	8,721		$	(3,666	)	$	5,055
Net realized gains reclassified into net income ⁽¹⁾	(2,129		)	628		(1,501		)	(2,474		)	1,040			(1,434		)
Net change	(26,706		)	7,894		(18,812		)	6,247			(2,626		)	3,621
Foreign currency translation adjustments:
Net unrealized gains arising during period	6,798			—		6,798			1,007			—			1,007
Net change	6,798			—		6,798			1,007			—			1,007
Other comprehensive (loss) income	$	(19,908	)	$	7,894	$	(12,014	)	$	7,254		$	(2,626	)	$	4,628


(1)	For the three months ended March 31, 2018 and 2017, pre-tax amounts were reported in Net gains on sales of available-for-sale investment securities on the Consolidated Statement of Income.

Business Segments

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Business Segments

The Company utilizes an internal reporting system to measure the performance of various operating segments within the Bank and the Company. The Company has identified three operating segments for purposes of management reporting: (1) Retail Banking; (2) Commercial Banking; and (3) Other. These three business segments meet the criteria of an operating segment: the segment engages in business activities from which it earns revenues and incurs expenses; its operating results are regularly reviewed by the Company’s chief operating decision maker to render decisions about resources to be allocated to the segments and assess its performance; and discrete financial information is available.

The Retail Banking segment focuses primarily on deposit operations through the Bank’s branch network. The Commercial Banking segment primarily generates commercial loans and deposits through domestic commercial lending offices located in the U.S. and foreign commercial lending offices in China and Hong Kong. Furthermore, the Commercial Banking segment offers a wide variety of international finance, trade finance, and cash management services and products. The remaining centralized functions, including treasury activities of the Company and eliminations of inter-segment amounts have been aggregated and included in the Other segment, which provides broad administrative support to the two core segments.

Operating segment results are based on the Company’s internal management reporting process, which reflects assignments and allocations of certain operating and administrative costs and the provision for credit losses. Net interest income is allocated based on the Company’s internal funds transfer pricing system, which assigns a cost of funds or a credit for funds to assets or liabilities based on their type, maturity or repricing characteristics. Noninterest income and noninterest expense directly attributable to a segment is assigned to the related business segment. Indirect costs, including technology related costs and corporate overhead, are allocated based on that segment’s estimated usage using factors, including, but not limited to, full-time equivalent employees, net interest margin, and loan and deposit volume. The provision for credit losses is based on charge-offs for the period as well as an allocation of the remaining consolidated provision expense based on the average loan balances for each segment during the period.

The Company’s internal funds transfer pricing process is formulated with the goal of encouraging loan and deposit growth that is consistent with the Company’s overall profitability objectives, as well as to provide a reasonable and consistent basis for the measurement of its business segments’ net interest margins and profitability. The Company’s internal funds transfer pricing assumptions and methodologies are reviewed at least annually to ensure that the process is reflective of current market conditions. The Company’s internal reporting process utilizes a full-allocation methodology. Under this methodology, corporate expenses and expenses incurred by the Other segment are allocated to the Retail Banking and Commercial Banking segments, except certain treasury-related expenses and an insignificant amount of other residual unallocated expenses.

In reporting segment income after taxes prior to the fourth quarter of 2017, the Company applied the consolidated effective tax rate to all of its business segments, and allocated the amortization of tax credit and other investments from the Other segment to the Retail Banking and Commercial Banking segments. In the fourth quarter of 2017, the Company has recently changed its methodology to measure the after-tax income of the Retail Banking and Commercial Banking segments using the applicable statutory tax rates, with the Other segment receiving the residual tax expense or benefit to arrive at the consolidated effective tax rate. With this change, the amortization of tax credit and other investments which had previously been allocated to each segment is now allocated to the Other segment only, along with the tax benefit. The Company has also allocated indirect costs to noninterest expense by segment for management reporting. In addition, operating segment profitability, which had previously been presented on an income before income tax basis only, has now been revised to be presented both on income before and income after tax basis.

Changes in the Company’s management structure and allocation or reporting methodologies may result in changes in the measurement of operating segment results. Results for prior year periods are generally reclassified for such changes for comparability unless it is deemed not practicable to do so.

The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three months ended March 31, 2018 and 2017:




($ in thousands)	Retail Banking			Commercial Banking			Other			Total
Three Months Ended March 31, 2018
Interest income	$	104,710		$	239,577		$	27,586		$	371,873
Charge for funds used	(49,273		)	(111,366		)	(18,327		)	(178,966		)
Interest spread on funds used	55,437			128,211			9,259			192,907
Interest expense	(24,940		)	(9,179		)	(11,061		)	(45,180		)
Credit on funds provided	145,451			25,448			8,067			178,966
Interest spread on funds provided (used)	120,511			16,269			(2,994		)	133,786
Net interest income before provision for credit losses	$	175,948		$	144,480		$	6,265		$	326,693
Provision for credit losses	$	3,093		$	17,125		$	—		$	20,218
Noninterest income	$	44,448		$	27,438		$	2,558		$	74,444
Noninterest expense	$	81,968		$	65,020		$	22,147		$	169,135
Segment income (loss) before income taxes	$	135,335		$	89,773		$	(13,324	)	$	211,784
Segment income after income taxes	$	96,968		$	64,362		$	25,702		$	187,032
As of March 31, 2018:
Segment assets	$	9,345,892		$	21,992,393		$	6,354,873		$	37,693,158




($ in thousands)	Retail Banking			Commercial Banking			Other			Total
Three Months Ended March 31, 2017
Interest income	$	81,025		$	192,419		$	29,225		$	302,669
Charge for funds used	(27,738		)	(64,509		)	(28,167		)	(120,414		)
Interest spread on funds used	53,287			127,910			1,058			182,255
Interest expense	(16,183		)	(5,098		)	(9,266		)	(30,547		)
Credit on funds provided	102,546			12,043			5,825			120,414
Interest spread on funds provided (used)	86,363			6,945			(3,441		)	89,867
Net interest income (loss) before provision for credit losses	$	139,650		$	134,855		$	(2,383	)	$	272,122
Provision for credit losses	$	378		$	6,690		$	—		$	7,068
Noninterest income	$	13,564		$	25,734		$	76,530		$	115,828
Noninterest expense	$	72,844		$	54,373		$	25,661		$	152,878
Segment income before income taxes	$	79,992		$	99,526		$	48,486		$	228,004
Segment income after income taxes	$	47,035		$	58,796		$	63,905		$	169,736
As of March 31, 2017:
Segment assets	$	8,213,268		$	19,624,237		$	7,504,621		$	35,342,126

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 19, 2018, the Company’s Board of Directors declared second quarter 2018 cash dividends on the Company’s common stock. The common stock cash dividend of $0.20 per share is payable on May 15, 2018 to stockholders of record as of May 1, 2018.

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank and East West’s various subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of March 31, 2018, East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, the Trusts are not included on the Consolidated Financial Statements.
Basis of Presentation	The unaudited interim Consolidated Financial Statements presented in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry, reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim period Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation.
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements	New Accounting Pronouncements Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which clarifies the principles for recognizing revenue for contracts to provide goods or services to customers. ASU 2014-09 also requires new quantitative and qualitative disclosures including the disaggregation of revenues and descriptions of performance obligations. The Company’s revenue is comprised of net interest income and noninterest income. The scope of this new guidance explicitly excludes net interest income, as well as other revenues from financial instruments including loans, leases, securities and derivatives. Accordingly, the majority of the Company’s revenues will not be affected. In addition, the new standard does not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s existing accounting for contracts within the scope of the new standard. The Company adopted this guidance as of January 1, 2018 using the modified retrospective method where there was no cumulative effect adjustment to retained earnings as a result of adopting this new standard. In addition, the standard did not have a material impact on our consolidated financial statements. The Company has provided a disaggregation of the significant categories of revenues within the scope of this guidance and expanded the qualitative disclosures of the Company’s noninterest income. See Note 12 — Revenue from Contracts with Customers for additional information. In January 2016, the FASB issued ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. With the exception of the amendments related to equity investments without readily determinable fair values and the use of exit price to measure the fair value of financial instruments for disclosure purposes that will be adopted prospectively, the Company adopted all the other amendments of the standard effective January 1, 2018 on a modified retrospective basis. ASU 2016-01 requires investments in marketable equity securities to be accounted for at fair value with unrealized gains or losses reflected in earnings. As of the date of adoption, the Company reclassified approximately $31.9 million of marketable equity securities that were previously classified as Available-for-sale investment securities, at fair value to Investment in tax credits and other investments, net. In addition, the Company recorded a cumulative-effect adjustment as of January 1, 2018 that reduced retained earnings by $545 thousand and increased AOCI by $385 thousand. The guidance also provides a measurement alternative for equity securities without readily determinable fair values to be measured at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer. Such price changes (if any) are reflected in earnings beginning in the period of adoption. The Company elected the measurement alternative for its privately held cost method investments of $11.4 million. No cumulative-effect adjustment to retained earnings was recorded related to the adoption of this guidance. The Company’s investments in the Federal Reserve Bank of San Francisco (“FRB”) and FHLB stock are not subject to this guidance and continue to be accounted for at cost. In addition, ASU 2016-01 eliminated the requirement to disclose methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost on the Consolidated Balance Sheet. Furthermore, for purposes of disclosing the fair value of financial instruments carried at amortized cost, the Company has updated its valuation methods as necessary to conform to an exit price concept as required by ASU 2016-01. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, to provide guidance on eight specific issues related to classification on the Consolidated Statement of Cash Flows. The specific issues cover cash payments for debt prepayment or debt extinguishment costs; cash outflows for settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments that are not made soon after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; and beneficial interests received in securitization transactions. The guidance also clarifies that in instances of cash flows with multiple aspects that cannot be separately identified, the classification should be based on the activity that is likely to be the predominant source or use of the cash flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the Company to include those amounts that are deemed to be restricted cash and restricted cash equivalents in its cash and cash equivalents balances on the Consolidated Statement of Cash Flows. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Consolidated Statement of Cash Flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 narrows the definition of a business by adding an initial screen to determine if substantially all of the fair value of the gross assets acquired is concentrated in a single asset or group of similar assets. If the screen is met, the set is not a business. ASU 2017-01 also specifies the minimum required inputs and processes necessary to be a business, and it removes the requirement to evaluate a market participant’s ability to replace missing elements when all of the inputs or processes that the seller used in operating a business were not obtained. ASU 2017-01 became effective on January 1, 2018. The Company adopted this guidance in the first quarter of 2018. This guidance is to be applied prospectively and did not have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU 2017-08, Receivables — Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities, which amends the amortization period for certain purchased callable debt securities held at a premium, shortening such period to the earliest call date. The guidance does not require any accounting changes for debt securities held at a discount; the discount continues to be amortized as an adjustment of yield over the contractual life (to maturity) of the instrument. ASU 2017-08 is effective on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method, with the cumulative-effect adjustment recognized to retained earnings as of the beginning of the period of adoption. The Company has elected to early adopt this guidance in the first quarter of 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In May 2017, the FASB issued ASU 2017-09, Compensation — Stock Compensation (Topic 718): Scope of Modification Accounting, which amends the scope of modification accounting for share-based payment arrangements. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification. ASU 2017-09 was effective on January 1, 2018, with early adoption permitted. The Company adopted the guidance in the first quarter of 2018 prospectively. The adoption did not have an impact on the Company’s Consolidated Financial Statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This guidance better aligns the Company’s risk management activities and financial reporting for hedging relationships through changes to both the description and measurement guidance for qualifying hedging relationships. The guidance also changes the presentation of hedge results, expands and refines hedge accounting for both nonfinancial and financial risk components, and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item on the Consolidated Financial Statements. ASU 2017-12 is effective on January 1, 2019 by modified retrospective method, with early adoption permitted. The Company has elected to early adopt this guidance in the first quarter of 2018, and the adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In February 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Under current U.S. GAAP, deferred tax assets and liabilities are to be adjusted for the effect of a change in tax laws or rates included in net income of the reporting period that includes the enactment date. This accounting treatment resulted in the tax effect of items within AOCI not reflecting the appropriate tax rate. This guidance permits companies to reclassify the stranded tax effects resulting from the Tax Act from AOCI to retained earnings. The guidance is effective on January 1, 2019 with early adoption permitted. The Company has elected to early adopt this guidance in the first quarter of 2018 retrospectively. The Company has identified the unrealized losses for available-for-sale securities to be the only item in AOCI with stranded tax effects, and made a policy election to reclassify the related stranded tax effects using the “investment-by-investment” approach. The adoption of the guidance resulted in a cumulative-effect adjustment as of January 1, 2018 that increased retained earnings by $6.7 million and reduced AOCI by the same amount. Recent Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which is intended to increase transparency and comparability in the accounting for lease transactions. The guidance requires lessees to recognize right-of-use assets and related lease liabilities for all leases with lease terms of more than 12 months on the Consolidated Balance Sheet, and provide quantitative and qualitative disclosures regarding key information about the leasing arrangements. For short-term leases with a term of 12 months or less, lessees can make a policy election not to recognize lease assets and lease liabilities. Lessor accounting is largely unchanged. ASU 2016-02 is effective on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method through a cumulative-effect adjustment. The Company has completed its review of its existing lease contracts and service contracts that may include embedded leases and is in the process of implementing a new system to address this guidance. The Company expects the adoption of ASU 2016-02 to result in additional assets and liabilities, as the Company will be required to recognize operating leases on its Consolidated Balance Sheet. The Company does not expect a material impact to its recognition of operating lease expense on its Consolidated Statement of Income and is in the process of evaluating the impacts of adopting the new accounting guidance on its disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new current expected credit loss (“CECL”) impairment model applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loan receivables, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). ASU 2016-13 is effective on January 1, 2020, with early adoption permitted on January 1, 2019. The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. While the Company is still evaluating the impact on its Consolidated Financial Statements, the Company expects that ASU 2016-13 may result in an increase in the allowance for credit losses due to the following factors: 1) the allowance for credit losses provides for expected credit losses over the remaining expected life of the loan portfolio, and will consider expected future changes in macroeconomic conditions; 2) the nonaccretable difference on the purchased credit impaired (“PCI”) loans will be recognized as an allowance, offset by an increase in the carrying value of the PCI loans; and 3) an allowance may be established for estimated credit losses on available-for-sale debt securities. The Company has begun its implementation efforts by identifying key interpretive issues, assessing its processes and identifying the system requirements against the new guidance to determine what modifications may be required. The implementation efforts also involve, but are not limited to, assessing potential macroeconomic factors that will be used to determine the reasonable and supportable forecast period. In January 2017, the FASB issued ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, to simplify the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. ASU 2017-04 is effective on January 1, 2020 and should be applied prospectively. Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The Company does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements.
Held-For-Sale Classification	The Company reports a business as held-for-sale when management has approved or received approval to sell the business and is committed to a formal plan, the business is available for immediate sale, the business is being actively marketed, the sale is anticipated to occur during the next 12 months and certain other specific criteria are met. A business classified as held-for-sale is recorded at the lower of its carrying amount or estimated fair value less costs to sell. If the carrying amount of the business exceeds its estimated fair value, a loss is recognized. Depreciation and amortization expense are not recorded with respect to the assets of a business after it is classified as held-for-sale.
Credit Quality Indicators	All loans are subject to the Company’s internal and external credit review and monitoring. Loans are risk rated based on an analysis of the current state of the borrower’s credit quality. The analysis of credit quality includes a review of all repayment sources, the borrower’s current payment performance/delinquency, current financial and liquidity status and all other relevant information. For single-family residential loans, payment performance/delinquency is the driving indicator for the risk ratings. Risk ratings are the overall credit quality indicator for the Company and the credit quality indicator utilized for estimating the appropriate allowance for loan losses. The Company utilizes a risk rating system, which classifies loans within the following categories: Pass, Watch, Special Mention, Substandard, Doubtful and Loss. The risk ratings reflect the relative strength of the repayment sources. Pass and Watch loans are loans that have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are loans that have potential weaknesses that warrant closer attention by management. Special Mention is a transitory grade. If potential weaknesses are resolved, the loan is upgraded to a Pass or Watch grade. If negative trends in the borrower’s financial status or other information indicate that the repayment sources may become inadequate, the loan is downgraded to a Substandard grade. Substandard loans are loans that have well-defined weaknesses that jeopardize the full and timely repayment of the loan. Substandard loans have a distinct possibility of loss, if the deficiencies are not corrected. Additionally, when management has assessed a potential for loss but a distinct possibility of loss is not recognizable, the loan remains classified as Substandard grade. Doubtful loans have insufficient sources of repayment and a high probability of loss. Loss loans are loans that are uncollectible and of such little value that they are no longer considered bankable assets. These internal risk ratings are reviewed routinely and adjusted based on changes in the borrowers’ financial status and the loans’ collectability.
Loans held-for-sale	Loans held-for-sale are carried at the lower of cost or fair value. When a determination is made at the time of commitment to originate or purchase loans as held-for-investment, it is the Company’s intent to hold these loans to maturity or for the “foreseeable future,” subject to periodic reviews under the Company’s management evaluation processes, including asset/liability management and credit risk management. When the Company subsequently changes its intent to hold certain loans, the loans are transferred from held-for-investment to held-for-sale at the lower of cost or fair value. From time to time, the Company purchases and sells loans in the secondary market. Certain purchased loans are transferred from held-for-investment to held-for-sale; and write-downs to allowance for loan losses are recorded, when appropriate.
Investments in Qualified Affordable Housing Partnerships, Net	The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income.
Goodwill and Core Deposit Intangibles	Goodwill is tested for impairment on an annual basis as of December 31, or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant.
Amortization Expense of Core Deposit Intangibles	The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits.
Earnings Per Share	Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during each period, plus common share equivalents calculated for warrants and RSUs outstanding using the treasury stock method.

Fair Value Measurement and Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis

Schedule of assets (liabilities) measured at fair value on a recurring basis

The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017:




($ in thousands)	Assets (Liabilities) Measured at Fair Value on a Recurring Basis as of March 31, 2018
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available-for-sale investment securities ⁽¹⁾:
U.S. Treasury securities	$	651,830	$	651,830	$	—	$	—
U.S. government agency and U.S. government sponsored enterprise debt securities	233,016		—		233,016		—
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	339,834		—		339,834		—
Residential mortgage-backed securities	989,453		—		989,453		—
Municipal securities	74,076		—		74,076		—
Non-agency residential mortgage-backed securities:
Investment grade	8,404		—		8,404		—
Corporate debt securities:
Investment grade	35,858		—		35,858		—
Foreign bonds:
Investment grade	478,945		—		478,945		—
Total available-for-sale investment securities	$	2,811,416	$	651,830	$	2,159,586	$	—

Investments in tax credit and other investments:
Equity securities with readily determinable fair value ⁽²⁾	$	30,987	$	20,489	$	10,498	$	—
Total investments in tax credit and other investments	$	30,987	$	20,489	$	10,498	$	—

Derivative assets⁽³⁾:
Interest rate swaps and options	$	51,933	$	—	$	51,933	$	—
Foreign exchange spot and forwards	6,087		—		6,087		—
RPAs	1		—		1		—
Equity warrants	1,513		—		582		931
Commodity options	297		—		297		—
Total derivative assets	$	59,831	$	—	$	58,900	$	931

Derivative liabilities:
Interest rate swaps ⁽³⁾	$	8,251	$	—	$	8,251	$	—
Foreign exchange forwards ⁽¹⁾	1,154		—		1,154		—
Interest rate swaps and options ⁽³⁾	72,893		—		72,893		—
Foreign exchange spot and forwards ⁽³⁾	4,066		—		4,066		—
RPAs ⁽³⁾	21		—		21		—
Commodity options ⁽³⁾	288		—		288		—
Total derivative liabilities	$	86,673	$	—	$	86,673	$	—


(1)	Changes in fair value of these financial instruments are recorded through other comprehensive income.


(2)	Equity securities with readily determinable fair value were comprised of mutual funds as of March 31, 2018. These securities are held at NAV and changes in fair value are recorded through net income.

(3) Changes in fair value of these financial instruments are recorded through net income.




($ in thousands)	Assets (Liabilities) Measured at Fair Value on a Recurring Basis as of December 31, 2017
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available-for-sale investment securities ⁽¹⁾:
U.S. Treasury securities	$	640,280	$	640,280	$	—	$	—
U.S. government agency and U.S. government sponsored enterprise debt securities	203,392		—		203,392		—
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	318,957		—		318,957		—
Residential mortgage-backed securities	1,190,271		—		1,190,271		—
Municipal securities	99,982		—		99,982		—
Non-agency residential mortgage-backed securities:
Investment grade	9,117		—		9,117		—
Corporate debt securities:
Investment grade	37,003		—		37,003		—
Foreign bonds:
Investment grade	486,408		—		486,408		—
Other securities	31,342		20,735		10,607		—
Total available-for-sale investment securities	$	3,016,752	$	661,015	$	2,355,737	$	—

Derivative assets ⁽²⁾:
Interest rate swaps and options	$	58,633	$	—	$	58,633	$	—
Foreign exchange spot and forwards	5,840		—		5,840		—
RPAs	1		—		1		—
Equity warrants	1,672		—		993		679
Total derivative assets	$	66,146	$	—	$	65,467	$	679

Derivative liabilities ⁽²⁾:
Interest rate swaps	$	6,799	$	—	$	6,799	$	—
Interest rate swaps and options	57,958		—		57,958		—
Foreign exchange spot and forwards	10,170		—		10,170		—
RPAs	8		—		8		—
Total derivative liabilities	$	74,935	$	—	$	74,935	$	—


(1)	Changes in fair value of these financial instruments are recorded through other comprehensive income.


(2)	Changes in fair value of these financial instruments are recorded through net income.

Reconciliation of the beginning and ending balances for warrants measured at fair value on a recurring basis using significant unobservable inputs (Level 3)

The following table presents a reconciliation of the beginning and ending balances for these warrants for the three months ended March 31, 2018:




($ in thousands)	Three Months Ended March 31, 2018
Equity warrants
Beginning balance	$	679
Total gains for the period included in earnings⁽¹⁾:	244
Issuances	8
Ending balance	$	931


(1)	Unrealized gains of warrant income are included in Ancillary loan fees and other income on the Consolidated Statement of Income.

Schedule of assets with fair value changes measured on a nonrecurring basis

The following tables present the carrying amounts of assets included on the Consolidated Balance Sheet that had fair value changes measured on a nonrecurring basis as of March 31, 2018 and December 31, 2017:




	Assets Measured at Fair Value on a Nonrecurring Basis as of March 31, 2018
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Non-PCI impaired loans:
Commercial lending:
Commercial and industrial (“C&I”)	$	29,403	$	—	$	—	$	29,403
Commercial real estate (“CRE”)	5,171		—		—		5,171
Consumer lending:
Single-family residential	2,600		—		—		2,600
Total non-PCI impaired loans	$	37,174	$	—	$	—	$	37,174




	Assets Measured at Fair Value on a Nonrecurring Basis as of December 31, 2017
($ in thousands)	Fair Value Measurements		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Non-PCI impaired loans:
Commercial lending:
C&I	$	31,404	$	—	$	—	$	31,404
CRE	2,667		—		—		2,667
Construction and land	3,973		—		—		3,973
Consumer lending:
Single-family residential	144		—		—		144
Total non-PCI impaired loans	$	38,188	$	—	$	—	$	38,188
OREO	$	9	$	—	$	—	$	9

Schedule of fair value adjustments of assets measured on a nonrecurring basis recognized

The following table presents the fair value adjustments of assets measured on a nonrecurring basis recognized during the three months ended and included on the Consolidated Balance Sheet as of March 31, 2018 and 2017:




	Three Months Ended March 31,
($ in thousands)	2018			2017
Non-PCI impaired loans:
Commercial lending:
C&I	$	13,899		$	32
CRE	95			(64		)
Consumer lending:
Single-family residential	(15		)	82
Other consumer	—			(1		)
Total non-PCI impaired loans	$	13,979		$	49
OREO	$	—		$	(285	)

Schedule of the carrying and fair values per the fair value hierarchy of certain financial instruments

The following tables present the fair value estimates for financial instruments as of March 31, 2018 and December 31, 2017, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in Note 4 — Fair Value Measurement and Fair Value of Financial Instruments. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable, accrued interest payable and mortgage servicing rights, which are included in Other assets. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. During the first quarter of 2018, the Company adopted ASU 2016-01 and has updated its valuation methods as necessary to conform to an “exit price” concept as required by ASU 2016-01.




($ in thousands)	March 31, 2018
($ in thousands)	Carrying Amount		Level 1		Level 2		Level 3		Estimated Fair Value
Financial assets:
Cash and cash equivalents	$	2,314,938	$	2,314,938	$	—	$	—	$	2,314,938
Interest-bearing deposits with banks	$	478,871	$	—	$	478,871	$	—	$	478,871
Resale agreements ⁽¹⁾	$	1,050,000	$	—	$	1,026,415	$	—	$	1,026,415
Restricted equity securities	$	73,787	$	—	$	73,787	$	—	$	73,787
Loans held-for-sale	$	46,181	$	—	$	46,181	$	—	$	46,181
Loans held-for-investment, net	$	29,257,594	$	—	$	—	$	29,503,038	$	29,503,038
Mortgage servicing rights	$	7,659	$	—	$	—	$	12,626	$	12,626
Accrued interest receivable	$	127,905	$	—	$	127,905	$	—	$	127,905
Financial liabilities:
Customer deposits:
Demand, checking, savings and money market deposits	$	26,407,708	$	—	$	26,407,708	$	—	$	26,407,708
Time deposits	$	6,201,069	$	—	$	6,177,010	$	—	$	6,177,010
Short-term borrowings	$	30,277	$	—	$	30,277	$	—	$	30,277
FHLB advances	$	324,451	$	—	$	335,788	$	—	$	335,788
Repurchase agreements ⁽¹⁾	$	50,000	$	—	$	114,260	$	—	$	114,260
Long-term debt	$	166,640	$	—	$	172,521	$	—	$	172,521
Accrued interest payable	$	12,686	$	—	$	12,686	$	—	$	12,686


(1)	Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of March 31, 2018, $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements.




($ in thousands)	December 31, 2017
($ in thousands)	Carrying Amount		Level 1		Level 2		Level 3		Estimated Fair Value
Financial assets:
Cash and cash equivalents	$	2,174,592	$	2,174,592	$	—	$	—	$	2,174,592
Interest-bearing deposits with banks	$	398,422	$	—	$	398,422	$	—	$	398,422
Resale agreements ⁽¹⁾	$	1,050,000	$	—	$	1,035,158	$	—	$	1,035,158
Restricted equity securities	$	73,521	$	—	$	73,521	$	—	$	73,521
Loans held-for-sale	$	85	$	—	$	85	$	—	$	85
Loans held-for-investment, net	$	28,688,590	$	—	$	—	$	28,956,349	$	28,956,349
Branch assets held-for-sale	$	91,318	$	5,143	$	10,970	$	78,132	$	94,245
Mortgage servicing rights	$	7,771	$	—	$	—	$	11,324	$	11,324
Accrued interest receivable	$	121,719	$	—	$	121,719	$	—	$	121,719
Financial liabilities:
Customer deposits:
Demand, checking, savings and money market deposits	$	25,974,314	$	—	$	25,974,314	$	—	$	25,974,314
Time deposits	$	5,640,749	$	—	$	5,626,855	$	—	$	5,626,855
Branch liability held-for-sale	$	605,111	$	—	$	—	$	643,937	$	643,937
FHLB advances	$	323,891	$	—	$	335,901	$	—	$	335,901
Repurchase agreements ⁽¹⁾	$	50,000	$	—	$	104,830	$	—	$	104,830
Long-term debt	$	171,577	$	—	$	171,673	$	—	$	171,673
Accrued interest payable	$	10,724	$	—	$	10,724	$	—	$	10,724


(1)	Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of December 31, 2017, $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements.

Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis

Schedule of quantitative information about significant unobservable inputs used in the valuation of assets classified as Level 3

The following table presents quantitative information about significant unobservable inputs used in the valuation of assets measured on a recurring basis classified as Level 3 as of March 31, 2018. Significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets or liabilities. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets or liabilities would be impacted by a predetermined percentage change.




($ in thousands)	Fair Value Measurements (Level 3)		Valuation Technique	Unobservable Input(s)	Weighted- Average
Derivative assets:
Equity warrants	$	931	Black-Scholes option pricing model	Volatility	48%
				Liquidity discount	47%

Fair Value, Measurements, Nonrecurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis

Schedule of quantitative information about significant unobservable inputs used in the valuation of assets classified as Level 3

The following table presents the quantitative information about the significant unobservable inputs used in the valuation of assets measured on a nonrecurring basis classified as Level 3 as of March 31, 2018 and December 31, 2017:




($ in thousands)	Fair Value Measurements (Level 3)		Valuation Technique(s)	Unobservable Input(s)	Range of Input(s)	Weighted-Average
March 31, 2018
Non-PCI impaired loans	$	28,596	Discounted cash flows	Discount	4% — 7%	5%
	$	3,114	Fair value of property	Selling cost	8%	8%
	$	4,849	Fair value of collateral	Discount	15% — 50%	39%
	$	615	Fair value of collateral	Contract value	NM	NM
December 31, 2017
Non-PCI impaired loans	$	22,802	Discounted cash flows	Discount	4% — 10%	6%
	$	9,773	Fair value of property	Selling cost	8%	8%
	$	3,207	Fair value of collateral	Discount	20% — 32%	29%
	$	2,406	Fair value of collateral	Contract value	NM	NM
OREO	$	9	Fair value of property	Selling cost	8%	8%

NM — Not meaningful.

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Tables)

3 Months Ended

Mar. 31, 2018

Resale and Repurchase Agreements [Abstract]

Schedule of balance sheet offsetting for resale and repurchase agreements

The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of March 31, 2018 and December 31, 2017:




($ in thousands)	As of March 31, 2018
	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Assets Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Received				Net Amount
Resale agreements	$	1,450,000	$	(400,000	)	$	1,050,000	$	—	$	(1,037,413	)	⁽¹⁾	$	12,587

	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Liabilities Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Pledged				Net Amount
Repurchase agreements	$	450,000	$	(400,000	)	$	50,000	$	—	$	(50,000	)	⁽²⁾	$	—




($ in thousands)	As of December 31, 2017
	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Assets Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Received				Net Amount
Resale agreements	$	1,450,000	$	(400,000	)	$	1,050,000	$	—	$	(1,045,696	)	⁽¹⁾	$	4,304

	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet			Net Amounts of Liabilities Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset on the Consolidated Balance Sheet					Financial Instruments		Collateral Pledged				Net Amount
Repurchase agreements	$	450,000	$	(400,000	)	$	50,000	$	—	$	(50,000	)	⁽²⁾	$	—


(1)	Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty.


(2)	Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty.

Securities (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of available-for-sale investment securities

The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of available-for-sale investment securities carried at fair value, as of March 31, 2018 and December 31, 2017:




	As of March 31, 2018
($ in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale investment securities:
U.S. Treasury securities	$	668,670	$	93	$	(16,933	)	$	651,830
U.S. government agency and U.S. government sponsored enterprise debt securities	235,776		175		(2,935		)	233,016
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	352,980		170		(13,316		)	339,834
Residential mortgage-backed securities	1,008,235		1,844		(20,626		)	989,453
Municipal securities	74,942		251		(1,117		)	74,076
Non-agency residential mortgage-backed securities:
Investment grade ⁽¹⁾	8,547		—		(143		)	8,404
Corporate debt securities:
Investment grade ⁽¹⁾	36,379		178		(699		)	35,858
Foreign bonds:
Investment grade ^{(1) (2)}	505,364		—		(26,419		)	478,945
Total available-for-sale investment securities	$	2,890,893	$	2,711	$	(82,188	)	$	2,811,416



	As of December 31, 2017
($ in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale investment securities:
U.S. Treasury securities	$	651,395	$	—	$	(11,115	)	$	640,280
U.S. government agency and U.S. government sponsored enterprise debt securities	206,815		62		(3,485		)	203,392
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	328,348		141		(9,532		)	318,957
Residential mortgage-backed securities	1,199,869		3,964		(13,562		)	1,190,271
Municipal securities	99,636		655		(309		)	99,982
Non-agency residential mortgage-backed securities:
Investment grade ⁽¹⁾	9,136		3		(22		)	9,117
Corporate debt securities:
Investment grade ⁽¹⁾	37,585		164		(746		)	37,003
Foreign bonds:
Investment grade ^{(1) (2)}	505,396		24		(19,012		)	486,408
Other securities ⁽³⁾	31,887		—		(545		)	31,342
Total available-for-sale investment securities	$	3,070,067	$	5,013	$	(58,328	)	$	3,016,752


(1)	Available-for-sale investment securities rated BBB- or higher by Standard & Poor’s (“S&P”) or Baa3 or higher by Moody’s are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody’s are considered non-investment grade. Classifications are based on the lower of the credit ratings by S&P or Moody’s.


(2)	Fair value of foreign bonds include $448.5 million and $456.1 million of multilateral development bank bonds as of March 31, 2018 and December 31, 2017, respectively.

(3)

Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities to Investments in tax credit and other investments, net, with changes in fair value recorded through net income.

Schedule of gross unrealized losses and related fair value of investment securities

The following tables present the gross unrealized losses and related fair value of the Company’s investment portfolio, aggregated by investment category and the length of time that individual security has been in a continuous unrealized loss position, as of March 31, 2018 and December 31, 2017:




	As of March 31, 2018
($ in thousands)	Less Than 12 Months					12 Months or More					Total
($ in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-sale investment securities:
U.S. Treasury securities	$	170,103	$	(3,130	)	$	457,952	$	(13,803	)	$	628,055	$	(16,933	)
U.S. government agency and U.S. government sponsored enterprise debt securities	133,861		(2,157		)	86,549		(778		)	220,410		(2,935		)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	117,057		(3,255		)	192,874		(10,061		)	309,931		(13,316		)
Residential mortgage-backed securities	461,197		(8,362		)	339,157		(12,264		)	800,354		(20,626		)
Municipal securities	24,618		(671		)	8,323		(446		)	32,941		(1,117		)
Non-agency residential mortgage-backed securities:
Investment grade	8,404		(143		)	—		—			8,404		(143		)
Corporate debt securities:
Investment grade	—		—			10,742		(699		)	10,742		(699		)
Foreign bonds:
Investment grade	130,436		(5,010		)	348,510		(21,409		)	478,946		(26,419		)
Total available-for-sale investment securities	$	1,045,676	$	(22,728	)	$	1,444,107	$	(59,460	)	$	2,489,783	$	(82,188	)



	As of December 31, 2017
($ in thousands)	Less Than 12 Months					12 Months or More					Total
($ in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-sale investment securities:
U.S. Treasury securities	$	168,061	$	(1,005	)	$	472,219	$	(10,110	)	$	640,280	$	(11,115	)
U.S. government agency and U.S. government sponsored enterprise debt securities	99,935		(623		)	85,281		(2,862		)	185,216		(3,485		)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities	113,775		(2,071		)	191,827		(7,461		)	305,602		(9,532		)
Residential mortgage-backed securities	413,621		(4,205		)	361,809		(9,357		)	775,430		(13,562		)
Municipal securities	8,490		(123		)	8,588		(186		)	17,078		(309		)
Non-agency residential mortgage-backed securities:
Investment grade	4,599		(22		)	—		—			4,599		(22		)
Corporate debt securities:
Investment grade	—		—			11,905		(746		)	11,905		(746		)
Foreign bonds:
Investment grade	103,149		(1,325		)	352,239		(17,687		)	455,388		(19,012		)
Other securities⁽¹⁾	31,215		(545		)	—		—			31,215		(545		)
Total available-for-sale investment securities	$	942,845	$	(9,919	)	$	1,483,868	$	(48,409	)	$	2,426,713	$	(58,328	)

(1)

Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities, at fair value to Investments in tax credit and other investments, net, with changes in fair value recorded through net income.

Schedule of the proceeds, gross realized gains and losses, and tax expense related to the sales of available-for-sale investment securities

The following table presents the proceeds, gross realized gains and tax expense related to the sales of available-for-sale investment securities for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Proceeds from sales	$	214,790	$	302,656
Gross realized gains	$	2,129	$	2,474
Related tax expense	$	628	$	1,040

Schedule of maturities of available-for-sale investment securities

The following table presents the scheduled maturities of available-for-sale investment securities as of March 31, 2018:




($ in thousands)	Amortized Cost		Fair Value
Due within one year	$	573,138	$	549,190
Due after one year through five years	818,412		796,717
Due after five years through ten years	188,149		184,944
Due after ten years	1,311,194		1,280,565
Total available-for-sale investment securities	$	2,890,893	$	2,811,416

Schedule of restricted equity securities

The following table presents the restricted equity securities as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018		December 31, 2017
FRB stock	$	56,537	$	56,271
FHLB stock	17,250		17,250
Total	$	73,787	$	73,521

Derivatives (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional and gross fair values of derivatives

The following table presents the total notional and gross fair value of the Company’s derivatives as of March 31, 2018 and December 31, 2017. The derivative asset and liability balances are presented on a gross basis, prior to the application of master netting arrangements, as included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheet.




($ in thousands)	March 31, 2018							December 31, 2017
	Notional Amount			Fair Value				Notional Amount			Fair Value
	Notional Amount			Derivative Assets		Derivative Liabilities		Notional Amount			Derivative Assets		Derivative Liabilities
Derivatives designated as hedging instruments:
Fair value hedges:
Interest rate swaps	$	35,811		$	—	$	8,251	$	35,811		$	—	$	6,799
Net investment hedges:
Foreign exchange forwards	97,464			—		1,154		—			—		—
Total derivatives designated as hedging instruments	$	133,275		$	—	$	9,405	$	35,811		$	—	$	6,799
Derivatives not designated as hedging instruments:
Interest rate swaps and options	$	10,155,401		$	51,933	$	72,893	$	9,333,860		$	58,633	$	57,958
Foreign exchange spot and forwards	895,788			6,087		4,066		770,215			5,840		10,170
Credit risk participation agreements	81,928			1		21		49,033			1		8
Equity warrants	—		⁽¹⁾	1,513		—		—		⁽¹⁾	1,672		—
Commodity options	—		⁽²⁾	297		288		—			—		—
Total derivatives not designated as hedging instruments	$	11,133,117		$	59,831	$	77,268	$	10,153,108		$	66,146	$	68,136


(1)	The Company held four warrants in public companies and 24 warrants in private companies as of March 31, 2018. The Company held four warrants in public companies and 23 warrants in private companies as of December 31, 2017.


(2)	The notional amount of the Company’s commodity option contracts entered with its customers and Chicago Mercantile Exchange (“CME”) totaled 216,000 barrels of oil each as of March 31, 2018.

Schedule of net gains (losses) recognized on the Consolidated Statement of Income related to derivatives designated as fair value hedge

The following table presents the net (losses) gains recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018			2017
(Losses) gains recorded in interest expense:
Recognized on interest rate swaps	$	(1,452	)	$	(817	)
Recognized on certificates of deposit	$	1,279		$	688

Schedule of the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit

The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of March 31, 2018:




($ in thousands)	March 31, 2018
	Hedged Items Currently Designated
	Carrying Amount of the Hedged Assets (Liabilities) ⁽¹⁾			Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (Liabilities)
Certificates of deposit	$	(29,779	)	$	6,024


(1)	The balance represents the full carrying amount of the hedged certificates of deposit as of the balance sheet date.

Schedule of net gains (losses) recognized related to derivatives not designated on the Consolidated Statements of Income as hedging instruments

The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three months ended March 31, 2018 and 2017:




($ in thousands)	Location in Consolidated Statement of Income	Three Months Ended March 31,
($ in thousands)	Location in Consolidated Statement of Income	2018			2017
Derivatives not designated as hedging instruments:
Interest rate swaps and options	Derivative fees and other income	$	1,106		$	(1,066	)
Foreign exchange spot and forwards	Letters of credit fees and foreign exchange income	3,857			5,838
Credit risk participation agreements	Derivative fees and other income	(13		)	1
Equity warrants	Ancillary loan fees and other income	(159		)	—
Commodity options	Derivative fees and other income	—			—
Net gains		$	4,791		$	4,773

Schedule of gross derivatives on the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments

The following tables present gross derivatives on the Consolidated Balance Sheet and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities and/or cash. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability (after netting is applied); thus instances of overcollateralization are not shown:




($ in thousands)	As of March 31, 2018
($ in thousands)	Total		Contracts Not Subject to Master Netting Arrangements		Contracts Subject to Master Netting Arrangements
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amount				Collateral Received				Net Amount
Derivative Assets	$	59,831	$	20,954	$	38,877	$	—	$	38,877	$	(12,957	)	⁽¹⁾	$	(23,810	)	⁽²⁾	$	2,110

	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amount				Collateral Posted				Net Amount
Derivative Liabilities	$	86,673	$	61,135	$	25,538	$	—	$	25,538	$	(12,957	)	⁽¹⁾	$	(12,038	)	⁽³⁾	$	543




($ in thousands)	As of December 31, 2017
($ in thousands)	Total		Contracts Not Subject to Master Netting Arrangements		Contracts Subject to Master Netting Arrangements
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amounts				Collateral Received				Net Amount
Derivative Assets	$	66,146	$	36,941	$	29,205	$	—	$	29,205	$	(18,955	)	⁽¹⁾	$	(9,839	)	⁽²⁾	$	411

	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet
	Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Recognized		Gross Amounts Offset on the Consolidated Balance Sheet		Net Amounts Presented on the Consolidated Balance Sheet		Derivative Amounts				Collateral Posted				Net Amount
Derivative Liabilities	$	74,935	$	26,732	$	48,203	$	—	$	48,203	$	(18,955	)	⁽¹⁾	$	(28,796	)	⁽³⁾	$	452


(1)	Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable master netting arrangements if the Company has elected to net.


(2)	Represents cash and securities received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements, including $6.9 million and $8.6 million of cash collateral received as of March 31, 2018 and December 31, 2017, respectively.


(3)	Represents cash and securities pledged against derivative liabilities with the same counterparty that are subject to enforceable master netting arrangements, including $1.5 million and $10.7 million of cash collateral posted as of March 31, 2018 and December 31, 2017, respectively.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Loans Receivable and Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2018

Loans and Leases Receivable Disclosure [Abstract]

Schedule of composition of non-PCI and PCI loans

The following table presents the composition of the Company’s non-PCI and PCI loans as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018									December 31, 2017
($ in thousands)	Non-PCI Loans ⁽¹⁾			PCI Loans ⁽²⁾			Total ⁽¹⁾⁽²⁾			Non-PCI Loans ⁽¹⁾			PCI Loans ⁽²⁾			Total ⁽¹⁾⁽²⁾
Commercial lending:
C&I	$	10,807,262		$	11,042		$	10,818,304		$	10,685,436		$	11,795		$	10,697,231
CRE	8,762,910			259,836			9,022,746			8,659,209			277,688			8,936,897
Multifamily residential	1,898,517			56,338			1,954,855			1,855,128			61,048			1,916,176
Construction and land	669,296			44			669,340			659,326			371			659,697
Total commercial lending	22,137,985			327,260			22,465,245			21,859,099			350,902			22,210,001
Consumer lending:
Single-family residential	4,818,094			112,486			4,930,580			4,528,911			117,378			4,646,289
Home equity lines of credit (“HELOCs”)	1,762,786			12,657			1,775,443			1,768,917			14,007			1,782,924
Other consumer	383,980			—			383,980			336,504			—			336,504
Total consumer lending	6,964,860			125,143			7,090,003			6,634,332			131,385			6,765,717
Total loans held-for-investment	$	29,102,845		$	452,403		$	29,555,248		$	28,493,431		$	482,287		$	28,975,718
Allowance for loan losses	(297,607		)	(47		)	(297,654		)	(287,070		)	(58		)	(287,128		)
Loans held-for-investment, net	$	28,805,238		$	452,356		$	29,257,594		$	28,206,361		$	482,229		$	28,688,590


(1)	Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(36.6) million and $(34.0) million as of March 31, 2018 and December 31, 2017, respectively.


(2)	Includes ASC 310-30 discount of $32.2 million and $35.3 million as of March 31, 2018 and December 31, 2017, respectively.

Summary of credit risk rating for non-PCI and PCI loans by portfolio segment

The following tables present the credit risk ratings for non-PCI loans by portfolio segment as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total Non-PCI Loans
Commercial lending:
C&I	$	10,464,618	$	164,161	$	150,565	$	27,918	$	10,807,262
CRE	8,614,575		41,942		106,393		—		8,762,910
Multifamily residential	1,884,434		—		14,083		—		1,898,517
Construction and land	614,481		684		54,131		—		669,296
Total commercial lending	21,578,108		206,787		325,172		27,918		22,137,985
Consumer lending:
Single-family residential	4,803,472		7,563		7,059		—		4,818,094
HELOCs	1,753,398		2,451		6,937		—		1,762,786
Other consumer	381,487		2		2,491		—		383,980
Total consumer lending	6,938,357		10,016		16,487		—		6,964,860
Total	$	28,516,465	$	216,803	$	341,659	$	27,918	$	29,102,845




($ in thousands)	December 31, 2017
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total Non-PCI Loans
Commercial lending:
C&I	$	10,369,516	$	114,769	$	180,269	$	20,882	$	10,685,436
CRE	8,484,635		65,616		108,958		—		8,659,209
Multifamily residential	1,839,958		—		15,170		—		1,855,128
Construction and land	614,441		4,590		40,295		—		659,326
Total commercial lending	21,308,550		184,975		344,692		20,882		21,859,099
Consumer lending:
Single-family residential	4,490,672		16,504		21,735		—		4,528,911
HELOCs	1,744,903		11,900		12,114		—		1,768,917
Other consumer	333,895		111		2,498		—		336,504
Total consumer lending	6,569,470		28,515		36,347		—		6,634,332
Total	$	27,878,020	$	213,490	$	381,039	$	20,882	$	28,493,431

The following tables present the credit risk ratings for PCI loans by portfolio segment as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total PCI Loans
Commercial lending:
C&I	$	10,071	$	23	$	948	$	—	$	11,042
CRE	219,255		2,525		38,056		—		259,836
Multifamily residential	52,426		—		3,912		—		56,338
Construction and land	44		—		—		—		44
Total commercial lending	281,796		2,548		42,916		—		327,260
Consumer lending:
Single-family residential	111,567		748		171		—		112,486
HELOCs	12,435		212		10		—		12,657
Total consumer lending	124,002		960		181		—		125,143
Total ⁽¹⁾	$	405,798	$	3,508	$	43,097	$	—	$	452,403




($ in thousands)	December 31, 2017
($ in thousands)	Pass/Watch		Special Mention		Substandard		Doubtful		Total PCI Loans
Commercial lending:
C&I	$	10,712	$	57	$	1,026	$	—	$	11,795
CRE	238,605		531		38,552		—		277,688
Multifamily residential	56,720		—		4,328		—		61,048
Construction and land	44		—		327		—		371
Total commercial lending	306,081		588		44,233		—		350,902
Consumer lending:
Single-family residential	113,905		1,543		1,930		—		117,378
HELOCs	12,642		—		1,365		—		14,007
Total consumer lending	126,547		1,543		3,295		—		131,385
Total ⁽¹⁾	$	432,628	$	2,131	$	47,528	$	—	$	482,287


(1)	Loans net of ASC 310-30 discount.

Schedule of aging analysis on non-PCI loans

The following tables present the aging analysis on non-PCI loans as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Accruing Loans 30-59 Days Past Due		Accruing Loans 60-89 Days Past Due		Accruing Loans 90 or More Days Past Due		Total Accruing Past Due Loans		Nonaccrual Loans Less Than 90 Days Past Due		Nonaccrual Loans 90 or More Days Past Due		Total Nonaccrual Loans		Current Accruing Loans		Total Non-PCI Loans
Commercial lending:
C&I	$	16,767	$	1,649	$	2,381	$	20,797	$	38,609	$	42,198	$	80,807	$	10,705,658	$	10,807,262
CRE	6,872		2,095		—		8,967		5,321		21,175		26,496		8,727,447		8,762,910
Multifamily residential	2,958		14		—		2,972		1,000		1,050		2,050		1,893,495		1,898,517
Construction and land	1,804		—		—		1,804		—		3,973		3,973		663,519		669,296
Total commercial lending	28,401		3,758		2,381		34,540		44,930		68,396		113,326		21,990,119		22,137,985
Consumer lending:
Single-family residential	8,230		7,733		—		15,963		6		7,459		7,465		4,794,666		4,818,094
HELOCs	4,421		2,369		—		6,790		26		6,909		6,935		1,749,061		1,762,786
Other consumer	24		2		—		26		—		2,491		2,491		381,463		383,980
Total consumer lending	12,675		10,104		—		22,779		32		16,859		16,891		6,925,190		6,964,860
Total	$	41,076	$	13,862	$	2,381	$	57,319	$	44,962	$	85,255	$	130,217	$	28,915,309	$	29,102,845




($ in thousands)	December 31, 2017
($ in thousands)	Accruing Loans 30-59 Days Past Due		Accruing Loans 60-89 Days Past Due		Accruing Loans 90 or More Days Past Due		Total Accruing Past Due Loans		Nonaccrual Loans Less Than 90 Days Past Due		Nonaccrual Loans 90 or More Days Past Due		Total Nonaccrual Loans		Current Accruing Loans		Total Non-PCI Loans
Commercial lending:
C&I	$	30,964	$	82	$	—	$	31,046	$	27,408	$	41,805	$	69,213	$	10,585,177	$	10,685,436
CRE	3,414		466		—		3,880		5,430		21,556		26,986		8,628,343		8,659,209
Multifamily residential	4,846		14		—		4,860		1,418		299		1,717		1,848,551		1,855,128
Construction and land	758		—		—		758		—		3,973		3,973		654,595		659,326
Total commercial lending	39,982		562		—		40,544		34,256		67,633		101,889		21,716,666		21,859,099
Consumer lending:
Single-family residential	13,269		5,355		—		18,624		6		5,917		5,923		4,504,364		4,528,911
HELOCs	4,286		4,186		—		8,472		89		3,917		4,006		1,756,439		1,768,917
Other consumer	14		23		—		37		—		2,491		2,491		333,976		336,504
Total consumer lending	17,569		9,564		—		27,133		95		12,325		12,420		6,594,779		6,634,332
Total	$	57,551	$	10,126	$	—	$	67,677	$	34,351	$	79,958	$	114,309	$	28,311,445	$	28,493,431

Summary of additions and modifications to non-PCI troubled debt restructurings

The following table presents the additions to non-PCI TDRs for the three months ended March 31, 2017:




($ in thousands)	Number of Loans	Pre- Modification Outstanding Recorded Investment		Post- Modification Outstanding Recorded Investment ⁽¹⁾		Financial Impact ⁽²⁾
Commercial lending:
C&I	2	$	6,448	$	4,914	$	1,273
CRE	1	1,526		1,505		—
Construction and land	2	86		—		—
Total	5	$	8,060	$	6,419	$	1,273


(1)	Includes subsequent payments after modification and reflects the balance as of March 31, 2017.


(2)	The financial impact includes charge-offs and specific reserves recorded at the modification date.

There were no non-PCI TDR modifications during the three months ended March 31, 2018. The following table presents the non-PCI TDR modifications for the three months ended March 31, 2017 by modification type:




($ in thousands)	Principal ⁽¹⁾		Principal and Interest ⁽²⁾		Total
Commercial lending:
C&I	$	—	$	4,914	$	4,914
CRE	1,505		—		1,505
Total	$	1,505	$	4,914	$	6,419


(1)	Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only.


(2)	Includes principal and interest deferments or reductions.

The following table presents information on loans modified as TDRs within the previous 12 months that have subsequently defaulted during the three months ended March 31, 2018 and 2017, and were still in default at the respective period end:




($ in thousands)	Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended March 31,
	2018			2017
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
Commercial lending:
C&I	—	$	—	1	$	2,718
Consumer lending:
HELOCs	1	$	155	—	$	—

Summary of non-PCI impaired loans

The following tables present information on non-PCI impaired loans as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
($ in thousands)	Unpaid Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Commercial lending:
C&I	$	123,336	$	43,192	$	55,789	$	98,981	$	28,564
CRE	40,935		27,210		7,706		34,916		615
Multifamily residential	9,819		6,483		2,934		9,417		103
Construction and land	4,691		3,973		—		3,973		—
Total commercial lending	178,781		80,858		66,429		147,287		29,282
Consumer lending:
Single-family residential	16,983		2,600		13,219		15,819		541
HELOCs	8,277		4,774		3,360		8,134		5
Other consumer	2,491		—		2,491		2,491		2,491
Total consumer lending	27,751		7,374		19,070		26,444		3,037
Total non-PCI impaired loans	$	206,532	$	88,232	$	85,499	$	173,731	$	32,319




($ in thousands)	December 31, 2017
($ in thousands)	Unpaid Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Commercial lending:
C&I	$	130,773	$	36,086	$	62,599	$	98,685	$	16,094
CRE	41,248		28,699		6,857		35,556		684
Multifamily residential	11,164		8,019		2,617		10,636		88
Construction and land	4,781		3,973		—		3,973		—
Total commercial lending	187,966		76,777		72,073		148,850		16,866
Consumer lending:
Single-family residential	15,501		—		14,338		14,338		534
HELOCs	5,484		2,287		2,921		5,208		4
Other consumer	2,491		—		2,491		2,491		2,491
Total consumer lending	23,476		2,287		19,750		22,037		3,029
Total non-PCI impaired loans	$	211,442	$	79,064	$	91,823	$	170,887	$	19,895

Schedule of average recorded investment and interest income recognized on non-PCI impaired loans

The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
	2018				2017
	Average Recorded Investment		Recognized Interest Income ⁽¹⁾		Average Recorded Investment		Recognized Interest Income ⁽¹⁾
Commercial lending:
C&I	$	99,457	$	1,900	$	143,214	$	221
CRE	35,166		868		44,772		35
Multifamily residential	9,458		116		9,269		38
Construction and land	3,973		69		4,717		—
Total commercial lending	148,054		2,953		201,972		294
Consumer lending:
Single-family residential	15,628		206		15,096		22
HELOCs	8,141		111		4,532		12
Other consumer	2,491		45		1		—
Total consumer lending	26,260		362		19,629		34
Total non-PCI impaired loans	$	174,314	$	3,315	$	221,601	$	328


(1)	Includes interest recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income.

Summary of activities in the allowance for credit losses

The following table presents a summary of activities in the allowance for loan losses by portfolio segment for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018			2017
Non-PCI Loans
Allowance for non-PCI loans, beginning of period	$	287,070		$	260,402
Provision for loan losses on non-PCI loans	19,933			8,046
Gross charge-offs:
Commercial lending:
C&I	(18,445		)	(7,057		)
Construction and land	—			(148		)
Consumer lending:
Single-family residential	(1		)	—
Other consumer	(17		)	(4		)
Total gross charge-offs	(18,463		)	(7,209		)
Gross recoveries:
Commercial lending:
C&I	7,687			455
CRE	427			569
Multifamily residential	333			567
Construction and land	435			24
Consumer lending:
Single-family residential	184			11
HELOCs	—			24
Other consumer	1			118
Total gross recoveries	9,067			1,768
Net charge-offs	(9,396		)	(5,441		)
Allowance for non-PCI loans, end of period	297,607			263,007

PCI Loans
Allowance for PCI loans, beginning of period	58			118
Reversal of loan losses on PCI loans	(11		)	(31		)
Allowance for PCI loans, end of period	47			87
Allowance for loan losses	$	297,654		$	263,094

The following table presents a summary of activities in the allowance for unfunded credit reserves for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Allowance for unfunded credit reserves, beginning of period	$	13,318	$	16,121
Provision for (reversal of) unfunded credit reserves	296		(947		)
Allowance for unfunded credit reserves, end of period	$	13,614	$	15,174

Summary of allowance for loan losses and recorded investments by portfolio segment and impairment methodology

The following tables present the Company’s allowance for loan losses and recorded investments by portfolio segment and impairment methodology as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018
	Commercial Lending								Consumer Lending
	C&I		CRE		Multifamily Residential		Construction and Land		Single- Family Residential		HELOCs		Other Consumer		Total
Allowance for loan losses
Individually evaluated for impairment	$	28,564	$	615	$	103	$	—	$	541	$	5	$	2,491	$	32,319
Collectively evaluated for impairment	141,131		39,056		18,396		32,220		25,416		7,036		2,033		265,288
Acquired with deteriorated credit quality	—		47		—		—		—		—		—		47
Total	$	169,695	$	39,718	$	18,499	$	32,220	$	25,957	$	7,041	$	4,524	$	297,654

Recorded investment in loans
Individually evaluated for impairment	$	98,981	$	34,916	$	9,417	$	3,973	$	15,819	$	8,134	$	2,491	$	173,731
Collectively evaluated for impairment	10,708,281		8,727,994		1,889,100		665,323		4,802,275		1,754,652		381,489		28,929,114
Acquired with deteriorated credit quality ⁽¹⁾	11,042		259,836		56,338		44		112,486		12,657		—		452,403
Total ⁽¹⁾	$	10,818,304	$	9,022,746	$	1,954,855	$	669,340	$	4,930,580	$	1,775,443	$	383,980	$	29,555,248




($ in thousands)	December 31, 2017
	Commercial Lending								Consumer Lending
	C&I		CRE		Multifamily Residential		Construction and Land		Single- Family Residential		HELOCs		Other Consumer		Total
Allowance for loan losses
Individually evaluated for impairment	$	16,094	$	684	$	88	$	—	$	534	$	4	$	2,491	$	19,895
Collectively evaluated for impairment	146,964		40,495		19,021		26,881		25,828		7,350		636		267,175
Acquired with deteriorated credit quality	—		58		—		—		—		—		—		58
Total	$	163,058	$	41,237	$	19,109	$	26,881	$	26,362	$	7,354	$	3,127	$	287,128

Recorded investment in loans
Individually evaluated for impairment	$	98,685	$	35,556	$	10,636	$	3,973	$	14,338	$	5,208	$	2,491	$	170,887
Collectively evaluated for impairment	10,586,751		8,623,653		1,844,492		655,353		4,514,573		1,763,709		334,013		28,322,544
Acquired with deteriorated credit quality ⁽¹⁾	11,795		277,688		61,048		371		117,378		14,007		—		482,287
Total ⁽¹⁾	$	10,697,231	$	8,936,897	$	1,916,176	$	659,697	$	4,646,289	$	1,782,924	$	336,504	$	28,975,718


(1)	Loans net of ASC 310-30 discount.

Summary of changes in accretable yield for PCI loans

The following table presents the changes in accretable yield for PCI loans for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018			2017
Accretable yield for PCI loans, beginning of period	$	101,977		$	136,247
Accretion	(9,134		)	(10,279		)
Changes in expected cash flows	3,021			2,022
Accretable yield for PCI loans, end of period	$	95,864		$	127,990

Schedule of sales, purchases and securitization of loans, and reclassification of loans held-for-investment to(from) loans held-for-sale

The following tables present information on the loans transferred from held-for-investment to held-for-sale, and sales and purchases of loans, during the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31, 2018
	Commercial Lending						Consumer Lending
	C&I		CRE		Multifamily Residential		Single-Family Residential		Other Consumer		Total
Loans transferred from held-for-investment to held-for-sale	$	146,391	$	9,376	$	—	$	—	$	—	$	155,767	⁽¹⁾
Sales	$	102,365	$	9,376	$	—	$	2,546	$	—	$	114,287	^(2)(3)(4)
Purchases	$	64,747	$	—	$	186	$	15,113	$	—	$	80,046	⁽⁵⁾




($ in thousands)	Three Months Ended March 31, 2017
	Commercial Lending						Consumer Lending
	C&I		CRE		Multifamily Residential		Single-Family Residential		Other Consumer		Total
Loans transferred from held-for-investment to held-for-sale	$	265,259	$	12,765	$	—	$	—	$	—	$	278,024	⁽¹⁾
Sales	$	236,679	$	12,765	$	—	$	4,310	$	22,191	$	275,945	^(2)(3)(4)
Purchases	$	147,116	$	—	$	126	$	—	$	—	$	147,242	⁽⁵⁾


(1)	The Company recorded $85 thousand and $92 thousand in write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for the three months ended March 31, 2018 and 2017, respectively.


(2)	Includes originated loans sold of $89.7 million and $29.3 million for the three months ended March 31, 2018 and 2017, respectively. Originated loans sold were primarily comprised of C&I and CRE loans for each of the three months ended March 31, 2018, and 2017.


(3)	Includes purchased loans sold in the secondary market of $24.6 million and $246.6 million for the three months ended March 31, 2018 and 2017, respectively.

(4)

Net gains on sales of loans, excluding the lower of cost or fair value adjustments, were $1.6 million and $2.8 million for the three months ended March 31, 2018 and 2017, respectively. No lower of cost or fair value adjustments were recorded for the three months ended March 31, 2018. In comparison, the lower of cost or fair value adjustment of $69 thousand was recorded in Net gains on sales of loans on the Consolidated Statement of Income for the three months ended March 31, 2017.


(5)	C&I loan purchases for each of the three months ended March 31, 2018 and 2017 mainly represent C&I syndicated loans.

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Tables)

3 Months Ended

Mar. 31, 2018

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]

Schedule of investments in qualified affordable housing partnerships, net and related unfunded commitments

The following table presents the balances of the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018		December 31, 2017
Investments in qualified affordable housing partnerships, net	$	160,574	$	162,824
Accrued expenses and other liabilities — Unfunded commitments	$	54,801	$	55,815

Schedule of additional information related to investments in qualified affordable housing partnerships, net

The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Tax credits and other tax benefits recognized	$	9,155	$	9,621
Amortization expense included in income tax expense	$	7,073	$	6,950

Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018			December 31, 2017
Gross balance ⁽¹⁾	$	86,099		$	100,166
Accumulated amortization ⁽¹⁾	(67,562		)	(79,112		)
Net carrying balance	$	18,537		$	21,054


(1)	Excludes fully amortized core deposit intangible assets.

Schedule of estimated future amortization expense of core deposit intangibles

The following table presents the estimated future amortization expense of core deposit intangibles as of March 31, 2018:




Year Ended December 31,	Amount ($ in thousands)
Remainder of 2018	$	4,008
2019	4,518
2020	3,634
2021	2,749
2022	1,865
Thereafter	1,763
Total	$	18,537

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of credit-related commitments

The following table presents the Company’s credit-related commitments as of March 31, 2018 and December 31, 2017:




($ in thousands)	March 31, 2018		December 31, 2017
Loan commitments	$	4,818,815	$	5,075,480
Commercial letters of credit and SBLCs	$	1,632,585	$	1,655,897

Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents revenue from contracts with customers within the scope of ASC 606 and other noninterest income, segregated by operating segments for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31, 2018
($ in thousands)	Retail Banking		Commercial Banking		Other		Total
Noninterest income:
Revenue from contracts with customers ⁽¹⁾:
Branch fees:
Deposit service charges and related fee income	$	6,014	$	3,014	$	158	$	9,186
Card income	1,070		174		—		1,244
Wealth management fees	2,796		157		—		2,953
Total revenue from contracts with customers	$	9,880	$	3,345	$	158	$	13,383
Other sources of noninterest income ⁽²⁾	34,568		24,093		2,400		61,061
Total noninterest income	$	44,448	$	27,438	$	2,558	$	74,444




($ in thousands)	Three Months Ended March 31, 2017
($ in thousands)	Retail Banking		Commercial Banking		Other		Total
Noninterest income:
Revenue from contracts with customers ⁽¹⁾:
Branch fees:
Deposit service charges and related fee income	$	5,837	$	2,742	$	105	$	8,684
Card income	1,027		213		—		1,240
Wealth management fees	3,246		1,089		—		4,335
Total revenue from contracts with customers	$	10,110	$	4,044	$	105	$	14,259
Other sources of noninterest income ⁽²⁾	3,454		21,690		76,425		101,569
Total noninterest income	$	13,564	$	25,734	$	76,530	$	115,828


(1)	There were no adjustments to the Company’s financial statements recorded as a result of the adoption of ASC 606. For comparability, the Company has adjusted prior period amounts to conform to the current period’s presentation.


(2)	Primarily represents revenue from contracts with customers that are out of the scope of ASC 606.

Stock Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of stock compensation expense and related net tax benefit

The following table presents a summary of the total share-based compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
($ in thousands)	2018		2017
Stock compensation costs	$	6,158	$	5,151
Related net tax benefits for stock compensation plans	$	4,778	$	4,414

Summary of activity for time-based and performance-based restricted stock units

The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the three months ended March 31, 2018 based on the target amount of awards:




	Three Months Ended March 31, 2018
	Time-Based RSUs				Performance-Based RSUs
	Shares		Weighted-Average Grant Date Fair Value		Shares		Weighted-Average Grant Date Fair Value
Outstanding, at beginning of period	1,166,580		$	42.00	424,299		$	41.44
Granted	389,667		67.32		120,286		70.13
Vested	(312,413	)	39.97		(133,295	)	41.15
Forfeited	(29,223	)	44.62		—		—
Outstanding, at end of period	1,214,611		$	50.58	411,290		$	49.93

Stockholders' Equity and Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity and Earnings Per Share [Abstract]

Schedule of earnings per share calculations

The following table presents the EPS calculations for the three months ended March 31, 2018 and 2017:




($ and shares in thousands, except per share data)	Three Months Ended March 31,
($ and shares in thousands, except per share data)	2018		2017
Basic
Net income	$	187,032	$	169,736

Basic weighted-average number of shares outstanding	144,664		144,249
Basic EPS	$	1.29	$	1.18

Diluted
Net income	$	187,032	$	169,736

Basic weighted-average number of shares outstanding	144,664		144,249
Diluted potential common shares ⁽¹⁾	1,275		1,483
Diluted weighted-average number of shares outstanding	145,939		145,732
Diluted EPS	$	1.28	$	1.16


(1)	Includes dilutive shares from RSUs and warrants for the three months ended March 31, 2018 and 2017.

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of the changes in components of accumulated other comprehensive income (loss) balances

The following table presents the changes in the components of AOCI balances for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
	2018									2017
	Available- for-Sale Investment Securities			Foreign Currency Translation Adjustments ⁽¹⁾			Total			Available- for-Sale Investment Securities			Foreign Currency Translation Adjustments ⁽¹⁾			Total
Beginning balance	$	(30,898	)	$	(6,621	)	$	(37,519	)	$	(28,772	)	$	(19,374	)	$	(48,146	)
Cumulative effect of change in accounting principle related to marketable equity securities⁽²⁾	385			—			385			—			—			—
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate⁽³⁾	(6,656		)	—			(6,656		)	—			—			—
Net unrealized (losses) gains arising during the period	(17,311		)	6,798			(10,513		)	5,055			1,007			6,062
Amounts reclassified from AOCI	(1,501		)	—			(1,501		)	(1,434		)	—			(1,434		)
Changes, net of taxes	(18,812		)	6,798			(12,014		)	3,621			1,007			4,628
Ending balance	$	(55,981	)	$	177		$	(55,804	)	$	(25,151	)	$	(18,367	)	$	(43,518	)


(1)	Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was Chinese Renminbi and USD, respectively.


(2)	Represents the impact of the adoption in the first quarter of 2018 of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.


(3)	Represents amounts reclassified from AOCI to retained earnings due to early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Schedule of components of other comprehensive income (loss), reclassifications to net income and the related tax effects

The following table presents the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three months ended March 31, 2018 and 2017:




($ in thousands)	Three Months Ended March 31,
	2018								2017
	Before-Tax			Tax Effect		Net-of-Tax			Before-Tax			Tax Effect			Net-of-Tax
Available-for-sale investment securities:
Net unrealized (losses) gains arising during the period	$	(24,577	)	$	7,266	$	(17,311	)	$	8,721		$	(3,666	)	$	5,055
Net realized gains reclassified into net income ⁽¹⁾	(2,129		)	628		(1,501		)	(2,474		)	1,040			(1,434		)
Net change	(26,706		)	7,894		(18,812		)	6,247			(2,626		)	3,621
Foreign currency translation adjustments:
Net unrealized gains arising during period	6,798			—		6,798			1,007			—			1,007
Net change	6,798			—		6,798			1,007			—			1,007
Other comprehensive (loss) income	$	(19,908	)	$	7,894	$	(12,014	)	$	7,254		$	(2,626	)	$	4,628


(1)	For the three months ended March 31, 2018 and 2017, pre-tax amounts were reported in Net gains on sales of available-for-sale investment securities on the Consolidated Statement of Income.

Business Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of operating results and other key financial measures by operating segments

The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three months ended March 31, 2018 and 2017:




($ in thousands)	Retail Banking			Commercial Banking			Other			Total
Three Months Ended March 31, 2018
Interest income	$	104,710		$	239,577		$	27,586		$	371,873
Charge for funds used	(49,273		)	(111,366		)	(18,327		)	(178,966		)
Interest spread on funds used	55,437			128,211			9,259			192,907
Interest expense	(24,940		)	(9,179		)	(11,061		)	(45,180		)
Credit on funds provided	145,451			25,448			8,067			178,966
Interest spread on funds provided (used)	120,511			16,269			(2,994		)	133,786
Net interest income before provision for credit losses	$	175,948		$	144,480		$	6,265		$	326,693
Provision for credit losses	$	3,093		$	17,125		$	—		$	20,218
Noninterest income	$	44,448		$	27,438		$	2,558		$	74,444
Noninterest expense	$	81,968		$	65,020		$	22,147		$	169,135
Segment income (loss) before income taxes	$	135,335		$	89,773		$	(13,324	)	$	211,784
Segment income after income taxes	$	96,968		$	64,362		$	25,702		$	187,032
As of March 31, 2018:
Segment assets	$	9,345,892		$	21,992,393		$	6,354,873		$	37,693,158




($ in thousands)	Retail Banking			Commercial Banking			Other			Total
Three Months Ended March 31, 2017
Interest income	$	81,025		$	192,419		$	29,225		$	302,669
Charge for funds used	(27,738		)	(64,509		)	(28,167		)	(120,414		)
Interest spread on funds used	53,287			127,910			1,058			182,255
Interest expense	(16,183		)	(5,098		)	(9,266		)	(30,547		)
Credit on funds provided	102,546			12,043			5,825			120,414
Interest spread on funds provided (used)	86,363			6,945			(3,441		)	89,867
Net interest income (loss) before provision for credit losses	$	139,650		$	134,855		$	(2,383	)	$	272,122
Provision for credit losses	$	378		$	6,690		$	—		$	7,068
Noninterest income	$	13,564		$	25,734		$	76,530		$	115,828
Noninterest expense	$	72,844		$	54,373		$	25,661		$	152,878
Segment income before income taxes	$	79,992		$	99,526		$	48,486		$	228,004
Segment income after income taxes	$	47,035		$	58,796		$	63,905		$	169,736
As of March 31, 2017:
Segment assets	$	8,213,268		$	19,624,237		$	7,504,621		$	35,342,126

Basis of Presentation (Details)	Mar. 31, 2018 trust
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned subsidiaries that are statutory business trusts (the Trusts)	6

Current Accounting Developments Current Accounting Developments (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Dec. 31, 2017

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Marketable equity securities

$ 31,900

Cumulative effect of a change in accounting principle

^[1]

(160)

Private Equity Funds

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cost method investments

$ 11,400

Retained Earnings

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect of a change in accounting principle

^[1]

(545)

Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate

^[2]

6,656

AOCI, Net of Tax

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect of a change in accounting principle

^[1]

385

Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate

^[2]

$ (6,656)

ASU 2016-01 | Retained Earnings

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect of a change in accounting principle

(545)

ASU 2016-01 | AOCI, Net of Tax

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect of a change in accounting principle

$ 385

[1]

Represents the impact of the adoption in the first quarter of 2018 of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

[2]

Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income during the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Dispositions and Held-for-Sale (Sales Leaseback) (Details) - Commercial Property In San Francisco $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Sale Leaseback Transaction [Line Items]
Sales price	$ 120.6
Net book value	31.6
Pre-tax profit from sale	85.4
Selling costs	3.6
Current period gain recognized	71.7
Deferred gain	$ 13.7

Dispositions and Held-for-Sale (Held-for-Sale) (Details) $ in Thousands	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 11, 2017 banking_branch
Long Lived Assets Held-for-sale [Line Items]
Branch assets held-for-sale	$ 0	$ 91,318
Branch liability held-for-sale	$ 0	605,111
Desert Community Bank
Long Lived Assets Held-for-sale [Line Items]
Branch liability held-for-sale		605,100
Desert Community Bank \| California
Long Lived Assets Held-for-sale [Line Items]
Number of branches to be sold \| banking_branch			8
Loans held-for-sale \| Desert Community Bank
Long Lived Assets Held-for-sale [Line Items]
Branch assets held-for-sale		78,100
Premises and equipment held-for-sale \| Desert Community Bank
Long Lived Assets Held-for-sale [Line Items]
Branch assets held-for-sale		$ 8,000

Dispositions and Held-for-Sale (Dispositions) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 17, 2018 banking_branch	Mar. 16, 2018 USD ($)
Disposition [Line Items]
Net gain on sale of business	$ 31,470	$ 0
Desert Community Bank
Disposition [Line Items]
Net cash payment in sale of branches	499,900
Net gain on sale of business	$ 31,500
Desert Community Bank \| California
Disposition [Line Items]
Number of branches sold \| banking_branch			8
Loans \| Desert Community Bank
Disposition [Line Items]
Branch assets sold				$ 59,100
Cash and cash equivalents \| Desert Community Bank
Disposition [Line Items]
Branch assets sold				9,000
Premises and equipment \| Desert Community Bank
Disposition [Line Items]
Branch assets sold				7,900
Deposits \| Desert Community Bank
Disposition [Line Items]
Branch liabilities sold				$ 613,700

Fair Value Measurement and Fair Value of Financial Instruments (Financial Assets and Liabilities Measurement on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment securities available-for-sale
Equity securities		$ 31,900
Derivative
Derivative assets	$ 59,831	66,146
Derivative liabilities	86,673	74,935
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Investment securities available-for-sale
Available-for-sale investment securities	651,830	661,015
Equity securities	20,489
Total investments in tax credit and other investments	20,489
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Interest rate swaps and options
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign exchange spot and forwards
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| RPAs
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Equity warrants
Derivative
Derivative assets	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commodity options
Derivative
Derivative assets	0
Derivative liabilities	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Interest rate swaps
Derivative
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign exchange forwards
Derivative
Derivative liabilities	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	651,830	640,280
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-agency residential mortgage-backed securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate debt securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign bonds \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other securities
Investment securities available-for-sale
Available-for-sale investment securities		20,735
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Investment securities available-for-sale
Available-for-sale investment securities	2,159,586	2,355,737
Equity securities	10,498
Total investments in tax credit and other investments	10,498
Derivative
Derivative assets	58,900	65,467
Derivative liabilities	86,673	74,935
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Interest rate swaps and options
Derivative
Derivative assets	51,933	58,633
Derivative liabilities	72,893	57,958
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign exchange spot and forwards
Derivative
Derivative assets	6,087	5,840
Derivative liabilities	4,066	10,170
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| RPAs
Derivative
Derivative assets	1	1
Derivative liabilities	21	8
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Equity warrants
Derivative
Derivative assets	582	993
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Commodity options
Derivative
Derivative assets	297
Derivative liabilities	288
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Interest rate swaps
Derivative
Derivative liabilities	8,251	6,799
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign exchange forwards
Derivative
Derivative liabilities	1,154
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	233,016	203,392
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	339,834	318,957
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	989,453	1,190,271
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	74,076	99,982
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Non-agency residential mortgage-backed securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	8,404	9,117
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate debt securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	35,858	37,003
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign bonds \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	478,945	486,408
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Other securities
Investment securities available-for-sale
Available-for-sale investment securities		10,607
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Equity securities	0
Total investments in tax credit and other investments	0
Derivative
Derivative assets	931	679
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Interest rate swaps and options
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Foreign exchange spot and forwards
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| RPAs
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Equity warrants
Derivative
Derivative assets	931	679
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Commodity options
Derivative
Derivative assets	0
Derivative liabilities	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Interest rate swaps
Derivative
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Foreign exchange forwards
Derivative
Derivative liabilities	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Non-agency residential mortgage-backed securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate debt securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Foreign bonds \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Other securities
Investment securities available-for-sale
Available-for-sale investment securities		0
Fair Value, Measurements, Recurring \| Fair Value Measurements
Investment securities available-for-sale
Available-for-sale investment securities	2,811,416	3,016,752
Equity securities	30,987
Total investments in tax credit and other investments	30,987
Derivative
Derivative assets	59,831	66,146
Derivative liabilities	86,673	74,935
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Interest rate swaps and options
Derivative
Derivative assets	51,933	58,633
Derivative liabilities	72,893	57,958
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Foreign exchange spot and forwards
Derivative
Derivative assets	6,087	5,840
Derivative liabilities	4,066	10,170
Fair Value, Measurements, Recurring \| Fair Value Measurements \| RPAs
Derivative
Derivative assets	1	1
Derivative liabilities	21	8
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Equity warrants
Derivative
Derivative assets	1,513	1,672
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Commodity options
Derivative
Derivative assets	297
Derivative liabilities	288
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Interest rate swaps
Derivative
Derivative liabilities	8,251	6,799
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Foreign exchange forwards
Derivative
Derivative liabilities	1,154
Fair Value, Measurements, Recurring \| Fair Value Measurements \| U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	651,830	640,280
Fair Value, Measurements, Recurring \| Fair Value Measurements \| U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	233,016	203,392
Fair Value, Measurements, Recurring \| Fair Value Measurements \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	339,834	318,957
Fair Value, Measurements, Recurring \| Fair Value Measurements \| U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	989,453	1,190,271
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	74,076	99,982
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Non-agency residential mortgage-backed securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	8,404	9,117
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Corporate debt securities \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	35,858	37,003
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Foreign bonds \| Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	$ 478,945	486,408
Fair Value, Measurements, Recurring \| Fair Value Measurements \| Other securities
Investment securities available-for-sale
Available-for-sale investment securities		$ 31,342

Fair Value Measurement and Fair Value of Financial Instruments (Reconciliation of Assets and Liabilities Measured on Recurring Basis) (Details) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) - Equity warrants $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 679
Included in earnings	244
Issuances	8
Ending balance	$ 931

Fair Value Measurement and Fair Value of Financial Instruments (Quantitative Information for Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Non-PCI Loans \| Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 37,174	$ 38,188
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	37,174	38,188
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Discounted cash flows \| Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 28,596	$ 22,802
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Discounted cash flows \| Fair Value, Measurements, Nonrecurring \| Weighted Average
Quantitative information
Discount	5.00%	6.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Discounted cash flows \| Fair Value, Measurements, Nonrecurring \| Minimum
Quantitative information
Discount	4.00%	4.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Discounted cash flows \| Fair Value, Measurements, Nonrecurring \| Maximum
Quantitative information
Discount	7.00%	10.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of property \| Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 3,114	$ 9,773
Selling cost	8.00%	8.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of property \| Fair Value, Measurements, Nonrecurring \| Weighted Average
Quantitative information
Selling cost	8.00%	8.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of collateral, discount \| Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 4,849	$ 3,207
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of collateral, discount \| Fair Value, Measurements, Nonrecurring \| Weighted Average
Quantitative information
Discount	39.00%	29.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of collateral, discount \| Fair Value, Measurements, Nonrecurring \| Minimum
Quantitative information
Discount	15.00%	20.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of collateral, discount \| Fair Value, Measurements, Nonrecurring \| Maximum
Quantitative information
Discount	50.00%	32.00%
Non-PCI Loans \| Significant Unobservable Inputs (Level 3) \| Fair value of collateral, contract value \| Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 615	$ 2,406
OREO \| Fair Value, Measurements, Nonrecurring
Quantitative information
OREO		9
OREO \| Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Nonrecurring
Quantitative information
OREO		9
OREO \| Significant Unobservable Inputs (Level 3) \| Fair value of property \| Fair Value, Measurements, Nonrecurring
Quantitative information
OREO		$ 9
Selling cost		8.00%
OREO \| Significant Unobservable Inputs (Level 3) \| Fair value of property \| Fair Value, Measurements, Nonrecurring \| Weighted Average
Quantitative information
Selling cost		8.00%
Equity warrants \| Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring
Quantitative information
Equity warrants	$ 931	$ 679
Equity warrants \| Significant Unobservable Inputs (Level 3) \| Black-Scholes option pricing model \| Fair Value, Measurements, Recurring \| Weighted Average
Quantitative information
Volatility	48.00%
Liquidity discount	47.00%

Fair Value Measurement and Fair Value of Financial Instruments (Carrying Amounts of Assets Included on the Consolidated Balance Sheets Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	$ 37,174	$ 38,188
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		9
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| OREO
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		0
Significant Other Observable Inputs (Level 2) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Significant Other Observable Inputs (Level 2) \| OREO
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		0
Significant Unobservable Inputs (Level 3) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	37,174	38,188
Significant Unobservable Inputs (Level 3) \| OREO
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		9
Commercial lending \| Commercial and industrial (“C&I”) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	29,403	31,404
Commercial lending \| Commercial and industrial (“C&I”) \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending \| Commercial and industrial (“C&I”) \| Significant Other Observable Inputs (Level 2) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending \| Commercial and industrial (“C&I”) \| Significant Unobservable Inputs (Level 3) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	29,403	31,404
Commercial lending \| Commercial real estate (“CRE”) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	5,171	2,667
Commercial lending \| Commercial real estate (“CRE”) \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending \| Commercial real estate (“CRE”) \| Significant Other Observable Inputs (Level 2) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending \| Commercial real estate (“CRE”) \| Significant Unobservable Inputs (Level 3) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	5,171	2,667
Commercial lending \| Construction and land \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		3,973
Commercial lending \| Construction and land \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		0
Commercial lending \| Construction and land \| Significant Other Observable Inputs (Level 2) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		0
Commercial lending \| Construction and land \| Significant Unobservable Inputs (Level 3) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		3,973
Consumer lending \| Real estate loan \| Single-family \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	2,600	144
Consumer lending \| Real estate loan \| Single-family \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Consumer lending \| Real estate loan \| Single-family \| Significant Other Observable Inputs (Level 2) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Consumer lending \| Real estate loan \| Single-family \| Significant Unobservable Inputs (Level 3) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	$ 2,600	$ 144

Fair Value Measurement and Fair Value of Financial Instruments (Fair Value Adjustments of Assets Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ 13,979	$ 49
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	(285)
Commercial lending \| Commercial and industrial (“C&I”) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	13,899	32
Commercial lending \| Commercial real estate (“CRE”) \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	95	(64)
Consumer lending \| Real estate loan \| Single-family \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	(15)	82
Consumer lending \| Other consumer \| Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ 0	$ (1)

Fair Value Measurement and Fair Value of Financial Instruments (Carrying and Fair Values per the Fair Value Hierarchy of Certain Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial assets:
Cash and cash equivalents	$ 2,314,938	$ 2,174,592	$ 2,434,643	$ 1,878,503
Interest-bearing deposits with banks	478,871	398,422
Resale agreements	1,050,000	1,050,000
Restricted equity securities	73,787	73,521
Loans held-for-sale	46,181	85
Loans held-for-investment, net	29,257,594	28,688,590
Branch assets held-for-sale	0	91,318
Financial liabilities:
Short-term borrowings	30,277	0
FHLB advances	324,451	323,891
Repurchase agreements	50,000	50,000
Long-term debt	166,640	171,577
Carrying amount of repurchase agreements eligible for netting against resale agreements	400,000	400,000
Gross repurchase agreements	450,000	450,000
Carrying Amount
Financial assets:
Cash and cash equivalents	2,314,938	2,174,592
Interest-bearing deposits with banks	478,871	398,422
Resale agreements	1,050,000	1,050,000
Restricted equity securities	73,787	73,521
Loans held-for-sale	46,181	85
Loans held-for-investment, net	29,257,594	28,688,590
Branch assets held-for-sale		91,318
Mortgage servicing rights	7,659	7,771
Accrued interest receivable	127,905	121,719
Financial liabilities:
Demand, checking, savings and money market deposits	26,407,708	25,974,314
Time deposits	6,201,069	5,640,749
Branch liability held-for-sale		605,111
Short-term borrowings	30,277
FHLB advances	324,451	323,891
Repurchase agreements	50,000	50,000
Long-term debt	166,640	171,577
Accrued interest payable	12,686	10,724
Estimated Fair Value
Financial assets:
Cash and cash equivalents	2,314,938	2,174,592
Interest-bearing deposits with banks	478,871	398,422
Resale agreements	1,026,415	1,035,158
Restricted equity securities	73,787	73,521
Loans held-for-sale	46,181	85
Loans held-for-investment, net	29,503,038	28,956,349
Branch assets held-for-sale		94,245
Mortgage servicing rights	12,626	11,324
Accrued interest receivable	127,905	121,719
Financial liabilities:
Demand, checking, savings and money market deposits	26,407,708	25,974,314
Time deposits	6,177,010	5,626,855
Branch liability held-for-sale		643,937
Short-term borrowings	30,277
FHLB advances	335,788	335,901
Repurchase agreements	114,260	104,830
Long-term debt	172,521	171,673
Accrued interest payable	12,686	10,724
Estimated Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	2,314,938	2,174,592
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	0	0
Branch assets held-for-sale		5,143
Mortgage servicing rights	0	0
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Branch liability held-for-sale		0
Short-term borrowings	0
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Estimated Fair Value \| Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	478,871	398,422
Resale agreements	1,026,415	1,035,158
Restricted equity securities	73,787	73,521
Loans held-for-sale	46,181	85
Loans held-for-investment, net	0	0
Branch assets held-for-sale		10,970
Mortgage servicing rights	0	0
Accrued interest receivable	127,905	121,719
Financial liabilities:
Demand, checking, savings and money market deposits	26,407,708	25,974,314
Time deposits	6,177,010	5,626,855
Branch liability held-for-sale		0
Short-term borrowings	30,277
FHLB advances	335,788	335,901
Repurchase agreements	114,260	104,830
Long-term debt	172,521	171,673
Accrued interest payable	12,686	10,724
Estimated Fair Value \| Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	29,503,038	28,956,349
Branch assets held-for-sale		78,132
Mortgage servicing rights	12,626	11,324
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Branch liability held-for-sale		643,937
Short-term borrowings	0
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Resale Agreements and Repurchase Agreements) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Resale agreements
Gross resale agreements	$ 1,450,000	$ 1,450,000
Weighted average interest rates (as a percent)	2.55%	2.43%
Repurchase agreements
Gross repurchase agreements	$ 450,000	$ 450,000
Weighted average interest rates (as a percent)	4.07%	3.65%

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 1,450,000	$ 1,450,000
Gross Amounts Offset on the Consolidated Balance Sheet	(400,000)	(400,000)
Net Amounts of Assets Presented on the Consolidated Balance Sheet	1,050,000	1,050,000
Gross Amounts Not Offset on the Consolidated Balance Sheet
Financial Instruments	0	0
Collateral Received	(1,037,413)	(1,045,696)
Net Amount	12,587	4,304
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	450,000	450,000
Gross Amounts Offset on the Consolidated Balance Sheet	(400,000)	(400,000)
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	50,000	50,000
Gross Amounts Not Offset on the Consolidated Balance Sheet
Financial Instruments	0	0
Collateral Pledged	(50,000)	(50,000)
Net Amount	$ 0	$ 0

Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale investment securities:
Amortized Cost	$ 2,890,893	$ 3,070,067
Gross Unrealized Gains	2,711	5,013
Gross Unrealized Losses	(82,188)	(58,328)
Fair Value	2,811,416	3,016,752
U.S. Treasury securities
Available-for-sale investment securities:
Amortized Cost	668,670	651,395
Gross Unrealized Gains	93	0
Gross Unrealized Losses	(16,933)	(11,115)
Fair Value	651,830	640,280
U.S. government agency and U.S. government sponsored enterprise debt securities
Available-for-sale investment securities:
Amortized Cost	235,776	206,815
Gross Unrealized Gains	175	62
Gross Unrealized Losses	(2,935)	(3,485)
Fair Value	233,016	203,392
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale investment securities:
Amortized Cost	352,980	328,348
Gross Unrealized Gains	170	141
Gross Unrealized Losses	(13,316)	(9,532)
Fair Value	339,834	318,957
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale investment securities:
Amortized Cost	1,008,235	1,199,869
Gross Unrealized Gains	1,844	3,964
Gross Unrealized Losses	(20,626)	(13,562)
Fair Value	989,453	1,190,271
Municipal securities
Available-for-sale investment securities:
Amortized Cost	74,942	99,636
Gross Unrealized Gains	251	655
Gross Unrealized Losses	(1,117)	(309)
Fair Value	74,076	99,982
Non-agency residential mortgage-backed securities \| Investment grade
Available-for-sale investment securities:
Amortized Cost	8,547	9,136
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(143)	(22)
Fair Value	8,404	9,117
Corporate debt securities \| Investment grade
Available-for-sale investment securities:
Amortized Cost	36,379	37,585
Gross Unrealized Gains	178	164
Gross Unrealized Losses	(699)	(746)
Fair Value	35,858	37,003
Foreign bonds \| Investment grade
Available-for-sale investment securities:
Amortized Cost	505,364	505,396
Gross Unrealized Gains	0	24
Gross Unrealized Losses	(26,419)	(19,012)
Fair Value	478,945	486,408
Foreign bonds \| Investment grade \| Multilateral development bank
Available-for-sale investment securities:
Fair Value	$ 448,500	456,100
Other securities
Available-for-sale investment securities:
Amortized Cost		31,887
Gross Unrealized Gains		0
Gross Unrealized Losses		(545)
Fair Value		$ 31,342

Securities (Continuous Unrealized Losses) (Details)	3 Months Ended
Securities (Continuous Unrealized Losses) (Details)	Mar. 31, 2018 USD ($) security	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) security
Fair Value
Less Than 12 Months	$ 1,045,676,000		$ 942,845,000
12 Months or More	1,444,107,000		1,483,868,000
Total	2,489,783,000		2,426,713,000
Gross Unrealized Losses
Less Than 12 Months	(22,728,000)		(9,919,000)
12 Months or More	(59,460,000)		(48,409,000)
Total	(82,188,000)		$ (58,328,000)
Impairment loss	$ 0	$ 0
Number of securities in an unrealized loss position \| security	192		165
U.S. Treasury securities
Fair Value
Less Than 12 Months	$ 170,103,000		$ 168,061,000
12 Months or More	457,952,000		472,219,000
Total	628,055,000		640,280,000
Gross Unrealized Losses
Less Than 12 Months	(3,130,000)		(1,005,000)
12 Months or More	(13,803,000)		(10,110,000)
Total	$ (16,933,000)		$ (11,115,000)
Number of securities in an unrealized loss position \| security	23		25
U.S. government agency and U.S. government sponsored enterprise debt securities
Fair Value
Less Than 12 Months	$ 133,861,000		$ 99,935,000
12 Months or More	86,549,000		85,281,000
Total	220,410,000		185,216,000
Gross Unrealized Losses
Less Than 12 Months	(2,157,000)		(623,000)
12 Months or More	(778,000)		(2,862,000)
Total	$ (2,935,000)		$ (3,485,000)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities
Gross Unrealized Losses
Number of securities in an unrealized loss position \| security	111		98
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Fair Value
Less Than 12 Months	$ 117,057,000		$ 113,775,000
12 Months or More	192,874,000		191,827,000
Total	309,931,000		305,602,000
Gross Unrealized Losses
Less Than 12 Months	(3,255,000)		(2,071,000)
12 Months or More	(10,061,000)		(7,461,000)
Total	(13,316,000)		(9,532,000)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Fair Value
Less Than 12 Months	461,197,000		413,621,000
12 Months or More	339,157,000		361,809,000
Total	800,354,000		775,430,000
Gross Unrealized Losses
Less Than 12 Months	(8,362,000)		(4,205,000)
12 Months or More	(12,264,000)		(9,357,000)
Total	(20,626,000)		(13,562,000)
Municipal securities
Fair Value
Less Than 12 Months	24,618,000		8,490,000
12 Months or More	8,323,000		8,588,000
Total	32,941,000		17,078,000
Gross Unrealized Losses
Less Than 12 Months	(671,000)		(123,000)
12 Months or More	(446,000)		(186,000)
Total	(1,117,000)		(309,000)
Non-agency residential mortgage-backed securities \| Investment grade
Fair Value
Less Than 12 Months	8,404,000		4,599,000
12 Months or More	0		0
Total	8,404,000		4,599,000
Gross Unrealized Losses
Less Than 12 Months	(143,000)		(22,000)
12 Months or More	0		0
Total	(143,000)		(22,000)
Corporate debt securities \| Investment grade
Fair Value
Less Than 12 Months	0		0
12 Months or More	10,742,000		11,905,000
Total	10,742,000		11,905,000
Gross Unrealized Losses
Less Than 12 Months	0		0
12 Months or More	(699,000)		(746,000)
Total	(699,000)		(746,000)
Foreign bonds \| Investment grade
Fair Value
Less Than 12 Months	130,436,000		103,149,000
12 Months or More	348,510,000		352,239,000
Total	478,946,000		455,388,000
Gross Unrealized Losses
Less Than 12 Months	(5,010,000)		(1,325,000)
12 Months or More	(21,409,000)		(17,687,000)
Total	$ (26,419,000)		$ (19,012,000)
Number of securities in an unrealized loss position \| security	17		16
Other securities
Fair Value
Less Than 12 Months			$ 31,215,000
12 Months or More			0
Total			31,215,000
Gross Unrealized Losses
Less Than 12 Months			(545,000)
12 Months or More			0
Total			$ (545,000)

Securities (Other-Than-Temporary Impairment) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investment securities available-for-sale
Other Than Temporary Impairment Credit Losses Recognized in Earnings
OTTI credit losses	$ 0	$ 0

Securities (Realized Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 214,790	$ 302,656
Gross realized gains	2,129	2,474
Related tax expense	$ 628	$ 1,040

Securities (Scheduled Maturities of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 573,138
Due after one year through five years	818,412
Due after five years through ten years	188,149
Due after ten years	1,311,194
Total available-for-sale investment securities	2,890,893
Fair Value
Due within one year	549,190
Due after one year through five years	796,717
Due after five years through ten years	184,944
Due after ten years	1,280,565
Total available-for-sale investment securities	2,811,416	$ 3,016,752
Fair values of available-for-sale investment securities pledged	$ 498,700	$ 534,300

Securities (Restricted Equity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
FRB stock	$ 56,537	$ 56,271
FHLB stock	17,250	17,250
Total	$ 73,787	$ 73,521

Derivatives (Notional and Fair Values) (Details) Boe in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Boe warrant	Dec. 31, 2017 USD ($) warrant
Fair Values of Derivative Instruments
Derivative Assets	$ 59,831	$ 66,146
Derivative Liabilities	86,673	74,935
Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	133,275	35,811
Derivative Assets	0	0
Derivative Liabilities	9,405	6,799
Derivatives designated as hedging instruments \| Interest rate swaps
Fair Values of Derivative Instruments
Notional Amount	35,811	35,811
Derivative Assets	0	0
Derivative Liabilities	8,251	6,799
Derivatives designated as hedging instruments \| Foreign exchange forwards
Fair Values of Derivative Instruments
Notional Amount	97,464	0
Derivative Assets	0	0
Derivative Liabilities	1,154	0
Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	11,133,117	10,153,108
Derivative Assets	59,831	66,146
Derivative Liabilities	77,268	68,136
Derivatives not designated as hedging instruments \| Interest rate swaps and options
Fair Values of Derivative Instruments
Notional Amount	10,155,401	9,333,860
Derivative Assets	51,933	58,633
Derivative Liabilities	72,893	57,958
Derivatives not designated as hedging instruments \| Foreign exchange spot and forwards
Fair Values of Derivative Instruments
Notional Amount	895,788	770,215
Derivative Assets	6,087	5,840
Derivative Liabilities	4,066	10,170
Derivatives not designated as hedging instruments \| Credit risk participation agreements
Fair Values of Derivative Instruments
Notional Amount	81,928	49,033
Derivative Assets	1	1
Derivative Liabilities	21	8
Derivatives not designated as hedging instruments \| Equity warrants
Fair Values of Derivative Instruments
Notional Amount	0	0
Derivative Assets	1,513	1,672
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments \| Warrant, Public Companies
Fair Values of Derivative Instruments
Derivative Assets	$ 582	$ 993
Number of warrants held \| warrant	4	4
Derivatives not designated as hedging instruments \| Warrant, Private Companies
Fair Values of Derivative Instruments
Derivative Assets	$ 931	$ 679
Number of warrants held \| warrant	24	23
Derivatives not designated as hedging instruments \| Commodity options
Fair Values of Derivative Instruments
Notional Amount	$ 0	$ 0
Derivative Assets	297	0
Derivative Liabilities	$ 288	$ 0
Derivatives not designated as hedging instruments \| Commodity options \| Customers
Fair Values of Derivative Instruments
Notional amount of commodity contracts in number of barrels of oil \| Boe	216
Derivatives not designated as hedging instruments \| Commodity options \| Chicago Mercantile Exchange (CME)
Fair Values of Derivative Instruments
Notional amount of commodity contracts in number of barrels of oil \| Boe	216

Derivatives (Narrative) (Details) Boe in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) Boe warrant	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) warrant
Derivative [Line Items]
Derivative liabilities	$ 86,673		$ 74,935
Derivative assets	59,831		66,146
Derivative asset, reduction in fair value	38,877		29,205
Derivative liability, reduction in fair value	25,538		48,203
Collateral posted	12,038		28,796
Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	133,275		35,811
Derivative liabilities	9,405		6,799
Derivative assets	0		0
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	11,133,117		10,153,108
Derivative liabilities	77,268		68,136
Derivative assets	59,831		66,146
Interest rate swaps \| Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	35,811		35,811
Derivative liabilities	8,251		6,799
Derivative assets	0		0
Interest rate swaps \| Derivatives designated as hedging instruments \| Fair Value Hedges
Derivative [Line Items]
Notional amount	35,800		35,800
Derivative liabilities	8,300		6,800
Foreign exchange forwards \| Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	97,464		0
Derivative liabilities	1,154		0
Derivative assets	0		0
Foreign exchange forwards \| Derivatives designated as hedging instruments \| Net investment hedges
Derivative [Line Items]
Notional amount	97,500
Derivative liabilities	1,200
Total fair value change in Foreign Currency Translation Adjustment with AOCI	(1,200)
Loss recognized in AOCI on net investment hedges (effective portion)		$ 648
(Losses) gains recognized in foreign exchange income (ineffective portion)		$ (2,000)
Interest rate swaps and options
Derivative [Line Items]
Notional amount of derivative assets	5,110,000		4,690,000
Notional amount of derivative liabilities	5,050,000		4,650,000
Interest rate swaps and options \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	10,155,401		9,333,860
Derivative liabilities	72,893		57,958
Derivative assets	51,933		58,633
Interest rate swaps and options \| Derivatives not designated as hedging instruments \| LCH
Derivative [Line Items]
Notional amount of derivative assets	1,400,000
Fair value of interest rate swaps cleared through LCH	0
Derivative asset, reduction in fair value	(25,700)
Derivative liability, reduction in fair value	(3,000)
Foreign exchange spot and forwards \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	895,788		770,215
Derivative liabilities	4,066		10,170
Derivative assets	6,087		5,840
Credit risk participation agreements \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	81,928		49,033
Derivative liabilities	21		8
Derivative assets	$ 1		$ 1
Weighted average remaining maturity (in years)	6 years 8 months 12 days		6 years
Credit risk participation agreements \| Derivatives not designated as hedging instruments \| Long
Derivative [Line Items]
Notional amount	$ 68,900		$ 35,200
Derivative liabilities	21		8
Interest rate derivative exposure	756		419
Credit risk participation agreements \| Derivatives not designated as hedging instruments \| Short
Derivative [Line Items]
Notional amount	13,000		13,800
Derivative assets	1		1
Equity warrants \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	0		0
Derivative liabilities	0		0
Derivative assets	1,513		1,672
Warrant, Public Companies \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets	$ 582		$ 993
Number of warrants held \| warrant	4		4
Warrant, Private Companies \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets	$ 931		$ 679
Number of warrants held \| warrant	24		23
Commodity options \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 0		$ 0
Derivative liabilities	288		0
Derivative assets	$ 297		0
Commodity options \| Derivatives not designated as hedging instruments \| Customers
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil \| Boe	216
Commodity options \| Derivatives not designated as hedging instruments \| Chicago Mercantile Exchange (CME)
Derivative [Line Items]
Derivative asset, reduction in fair value	$ (276)
Derivative liability, reduction in fair value	$ (297)
Notional amount of commodity contracts in number of barrels of oil \| Boe	216
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	$ 14,900		6,300
Collateral posted	12,300		$ 6,200
Additional collateral required to be posted if credit rating is downgraded	$ 3,500

Derivatives (Net Gains (Losses) on Derivatives Designated as Hedges) (Details) - Fair Value Hedges - Derivatives designated as hedging instruments - Interest Expense - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Certificates of deposits
Derivative [Line Items]
Recognized on certificates of deposit	$ 1,279	$ 688
Interest rate swaps
Derivative [Line Items]
Recognized on interest rate swaps	$ (1,452)	$ (817)

Derivatives (Hedged Items Currently Designated) (Details) - Certificates of deposits - Fair Value Hedges - Interest rate swaps - Derivatives designated as hedging instruments $ in Thousands	Mar. 31, 2018 USD ($)
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ (29,779)
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (Liabilities)	$ 6,024

Derivatives (Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 4,791	$ 4,773
Interest rate swaps and options \| Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	1,106	(1,066)
Foreign exchange spot and forwards \| Letters of credit fees and foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	3,857	5,838
Credit risk participation agreements \| Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(13)	1
Equity warrants \| Ancillary loan fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(159)	0
Commodity options \| Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 0	$ 0

Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives Assets
Total Gross Amounts	$ 59,831	$ 66,146
Gross Amounts of Contracts Not Subject to Master Netting Arrangements	20,954	36,941
Gross Amounts of Contracts Subject to Master Netting Arrangements	38,877	29,205
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts Presented on the Consolidated Balance Sheet	38,877	29,205
Gross Amounts Not Offset on the Consolidated Balance Sheet
Derivative Amount	(12,957)	(18,955)
Collateral Received	(23,810)	(9,839)
Net Amount	2,110	411
Cash collateral received	6,900	8,600
Derivatives Liabilities
Total Gross Amounts	86,673	74,935
Gross Amounts of Contracts Not Subject to Master Netting Arrangements	61,135	26,732
Gross Amounts of Contracts Subject to Master Netting Arrangements	25,538	48,203
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts Presented on the Consolidated Balance Sheet	25,538	48,203
Gross Amounts Not Offset on the Consolidated Balance Sheet
Derivative Amounts	(12,957)	(18,955)
Collateral Posted	(12,038)	(28,796)
Net Amount	543	452
Cash collateral posted	$ 1,500	$ 10,700

Loans Receivable and Allowance for Credit Losses (Composition of Non-PCI and PCI Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 29,555,248	$ 28,975,718
Allowance for loan losses	(297,654)	(287,128)
Loans held-for-investment, net	29,257,594	28,688,590
Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	22,465,245	22,210,001
Commercial lending \| Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	10,818,304	10,697,231
Commercial lending \| Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	9,022,746	8,936,897
Commercial lending \| Real estate loan \| Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,954,855	1,916,176
Commercial lending \| Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	669,340	659,697
Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	7,090,003	6,765,717
Consumer lending \| Real estate loan \| Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	4,930,580	4,646,289
Consumer lending \| Home equity lines of credit (“HELOCs”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,775,443	1,782,924
Consumer lending \| Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	383,980	336,504
PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	452,403	482,287
Allowance for loan losses	(47)	(58)
Loans held-for-investment, net	452,356	482,229
Discount related to ASC 310-30	32,200	35,300
PCI Loans \| Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	327,260	350,902
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	11,042	11,795
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	259,836	277,688
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	56,338	61,048
PCI Loans \| Commercial lending \| Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	44	371
PCI Loans \| Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	125,143	131,385
PCI Loans \| Consumer lending \| Real estate loan \| Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	112,486	117,378
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	12,657	14,007
PCI Loans \| Consumer lending \| Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	0	0
Non-PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	29,102,845	28,493,431
Allowance for loan losses	(297,607)	(287,070)
Loans held-for-investment, net	28,805,238	28,206,361
Unearned fees, premiums and discounts, net	(36,600)	(34,000)
Non-PCI Loans \| Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	22,137,985	21,859,099
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	10,807,262	10,685,436
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	8,762,910	8,659,209
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,898,517	1,855,128
Non-PCI Loans \| Commercial lending \| Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	669,296	659,326
Non-PCI Loans \| Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	6,964,860	6,634,332
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	4,818,094	4,528,911
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,762,786	1,768,917
Non-PCI Loans \| Consumer lending \| Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 383,980	$ 336,504

Loans Receivable and Allowance for Credit Losses (Composition of Non-PCI and PCI Loans - Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment pledged as collateral	$ 19,495,480	$ 18,880,598
Minimum
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Adjustable rate mortgage, initial fixed periods	1 year
Maximum
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Adjustable rate mortgage, initial fixed periods	7 years
Consumer lending \| Home equity lines of credit (“HELOCs”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loan-to-value ratio (or less at origination)	60.00%

Loans Receivable and Allowance for Credit Losses (Credit Risk Ratings for Non-PCI Loans by Portfolio Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	$ 29,555,248	$ 28,975,718
Commercial lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	22,465,245	22,210,001
Commercial lending \| Commercial and industrial (“C&I”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,818,304	10,697,231
Commercial lending \| Commercial real estate (“CRE”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	9,022,746	8,936,897
Commercial lending \| Real estate loan \| Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,954,855	1,916,176
Commercial lending \| Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	669,340	659,697
Consumer lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7,090,003	6,765,717
Consumer lending \| Real estate loan \| Single-family
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	4,930,580	4,646,289
Consumer lending \| Home equity lines of credit (“HELOCs”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,775,443	1,782,924
Consumer lending \| Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	383,980	336,504
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	29,102,845	28,493,431
Non-PCI Loans \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	28,516,465	27,878,020
Non-PCI Loans \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	216,803	213,490
Non-PCI Loans \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	341,659	381,039
Non-PCI Loans \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	27,918	20,882
Non-PCI Loans \| Commercial lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	22,137,985	21,859,099
Non-PCI Loans \| Commercial lending \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	21,578,108	21,308,550
Non-PCI Loans \| Commercial lending \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	206,787	184,975
Non-PCI Loans \| Commercial lending \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	325,172	344,692
Non-PCI Loans \| Commercial lending \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	27,918	20,882
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,807,262	10,685,436
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,464,618	10,369,516
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	164,161	114,769
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	150,565	180,269
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	27,918	20,882
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	8,762,910	8,659,209
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	8,614,575	8,484,635
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	41,942	65,616
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	106,393	108,958
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,898,517	1,855,128
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,884,434	1,839,958
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	14,083	15,170
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Commercial lending \| Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	669,296	659,326
Non-PCI Loans \| Commercial lending \| Construction and land \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	614,481	614,441
Non-PCI Loans \| Commercial lending \| Construction and land \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	684	4,590
Non-PCI Loans \| Commercial lending \| Construction and land \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	54,131	40,295
Non-PCI Loans \| Commercial lending \| Construction and land \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Consumer lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	6,964,860	6,634,332
Non-PCI Loans \| Consumer lending \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	6,938,357	6,569,470
Non-PCI Loans \| Consumer lending \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,016	28,515
Non-PCI Loans \| Consumer lending \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	16,487	36,347
Non-PCI Loans \| Consumer lending \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	4,818,094	4,528,911
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	4,803,472	4,490,672
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7,563	16,504
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7,059	21,735
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,762,786	1,768,917
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,753,398	1,744,903
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,451	11,900
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	6,937	12,114
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans \| Consumer lending \| Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	383,980	336,504
Non-PCI Loans \| Consumer lending \| Other consumer \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	381,487	333,895
Non-PCI Loans \| Consumer lending \| Other consumer \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2	111
Non-PCI Loans \| Consumer lending \| Other consumer \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,491	2,498
Non-PCI Loans \| Consumer lending \| Other consumer \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	452,403	482,287
PCI Loans \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	405,798	432,628
PCI Loans \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	3,508	2,131
PCI Loans \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	43,097	47,528
PCI Loans \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	327,260	350,902
PCI Loans \| Commercial lending \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	281,796	306,081
PCI Loans \| Commercial lending \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,548	588
PCI Loans \| Commercial lending \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	42,916	44,233
PCI Loans \| Commercial lending \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	11,042	11,795
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,071	10,712
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	23	57
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	948	1,026
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”) \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	259,836	277,688
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	219,255	238,605
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,525	531
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	38,056	38,552
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”) \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	56,338	61,048
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	52,426	56,720
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	3,912	4,328
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending \| Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	44	371
PCI Loans \| Commercial lending \| Construction and land \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	44	44
PCI Loans \| Commercial lending \| Construction and land \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Commercial lending \| Construction and land \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	327
PCI Loans \| Commercial lending \| Construction and land \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Consumer lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	125,143	131,385
PCI Loans \| Consumer lending \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	124,002	126,547
PCI Loans \| Consumer lending \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	960	1,543
PCI Loans \| Consumer lending \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	181	3,295
PCI Loans \| Consumer lending \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Consumer lending \| Real estate loan \| Single-family
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	112,486	117,378
PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	111,567	113,905
PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	748	1,543
PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	171	1,930
PCI Loans \| Consumer lending \| Real estate loan \| Single-family \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	12,657	14,007
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	12,435	12,642
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	212	0
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10	1,365
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”) \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans \| Consumer lending \| Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	$ 0	$ 0

Loans Receivable and Allowance for Credit Losses (Aging Analysis on Non-PCI Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Nonaccrual and Past Due Loans
Number of days beyond loan classified nonaccrual	90 days
Total loans	$ 29,555,248	$ 28,975,718
Commercial lending
Nonaccrual and Past Due Loans
Total loans	22,465,245	22,210,001
Commercial lending \| Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total loans	10,818,304	10,697,231
Commercial lending \| Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total loans	9,022,746	8,936,897
Commercial lending \| Real estate loan \| Multifamily
Nonaccrual and Past Due Loans
Total loans	1,954,855	1,916,176
Commercial lending \| Construction and land
Nonaccrual and Past Due Loans
Total loans	669,340	659,697
Consumer lending
Nonaccrual and Past Due Loans
Total loans	7,090,003	6,765,717
Consumer lending \| Real estate loan \| Single-family
Nonaccrual and Past Due Loans
Total loans	4,930,580	4,646,289
Consumer lending \| Home equity lines of credit (“HELOCs”)
Nonaccrual and Past Due Loans
Total loans	1,775,443	1,782,924
Consumer lending \| Other consumer
Nonaccrual and Past Due Loans
Total loans	383,980	336,504
Non-PCI Loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	57,319	67,677
Total Nonaccrual Loans	130,217	114,309
Current Accruing Loans	28,915,309	28,311,445
Total loans	29,102,845	28,493,431
Non-PCI Loans \| Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	41,076	57,551
Non-PCI Loans \| Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	13,862	10,126
Non-PCI Loans \| Accruing Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,381	0
Total Nonaccrual Loans	85,255	79,958
Non-PCI Loans \| Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	44,962	34,351
Non-PCI Loans \| Commercial lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	34,540	40,544
Total Nonaccrual Loans	113,326	101,889
Current Accruing Loans	21,990,119	21,716,666
Total loans	22,137,985	21,859,099
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	20,797	31,046
Total Nonaccrual Loans	80,807	69,213
Current Accruing Loans	10,705,658	10,585,177
Total loans	10,807,262	10,685,436
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,967	3,880
Total Nonaccrual Loans	26,496	26,986
Current Accruing Loans	8,727,447	8,628,343
Total loans	8,762,910	8,659,209
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,972	4,860
Total Nonaccrual Loans	2,050	1,717
Current Accruing Loans	1,893,495	1,848,551
Total loans	1,898,517	1,855,128
Non-PCI Loans \| Commercial lending \| Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,804	758
Total Nonaccrual Loans	3,973	3,973
Current Accruing Loans	663,519	654,595
Total loans	669,296	659,326
Non-PCI Loans \| Commercial lending \| Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	28,401	39,982
Non-PCI Loans \| Commercial lending \| Accruing Loans 30-59 Days Past Due \| Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	16,767	30,964
Non-PCI Loans \| Commercial lending \| Accruing Loans 30-59 Days Past Due \| Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,872	3,414
Non-PCI Loans \| Commercial lending \| Accruing Loans 30-59 Days Past Due \| Real estate loan \| Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,958	4,846
Non-PCI Loans \| Commercial lending \| Accruing Loans 30-59 Days Past Due \| Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,804	758
Non-PCI Loans \| Commercial lending \| Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,758	562
Non-PCI Loans \| Commercial lending \| Accruing Loans 60-89 Days Past Due \| Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,649	82
Non-PCI Loans \| Commercial lending \| Accruing Loans 60-89 Days Past Due \| Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,095	466
Non-PCI Loans \| Commercial lending \| Accruing Loans 60-89 Days Past Due \| Real estate loan \| Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	14	14
Non-PCI Loans \| Commercial lending \| Accruing Loans 60-89 Days Past Due \| Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans \| Commercial lending \| Accruing Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,381	0
Total Nonaccrual Loans	68,396	67,633
Non-PCI Loans \| Commercial lending \| Accruing Loans 90 or More Days Past Due \| Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,381	0
Total Nonaccrual Loans	42,198	41,805
Non-PCI Loans \| Commercial lending \| Accruing Loans 90 or More Days Past Due \| Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	21,175	21,556
Non-PCI Loans \| Commercial lending \| Accruing Loans 90 or More Days Past Due \| Real estate loan \| Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	1,050	299
Non-PCI Loans \| Commercial lending \| Accruing Loans 90 or More Days Past Due \| Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	3,973	3,973
Non-PCI Loans \| Commercial lending \| Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	44,930	34,256
Non-PCI Loans \| Commercial lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	38,609	27,408
Non-PCI Loans \| Commercial lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	5,321	5,430
Non-PCI Loans \| Commercial lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Real estate loan \| Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,000	1,418
Non-PCI Loans \| Commercial lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI Loans \| Consumer lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	22,779	27,133
Total Nonaccrual Loans	16,891	12,420
Current Accruing Loans	6,925,190	6,594,779
Total loans	6,964,860	6,634,332
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	15,963	18,624
Total Nonaccrual Loans	7,465	5,923
Current Accruing Loans	4,794,666	4,504,364
Total loans	4,818,094	4,528,911
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,790	8,472
Total Nonaccrual Loans	6,935	4,006
Current Accruing Loans	1,749,061	1,756,439
Total loans	1,762,786	1,768,917
Non-PCI Loans \| Consumer lending \| Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	26	37
Total Nonaccrual Loans	2,491	2,491
Current Accruing Loans	381,463	333,976
Total loans	383,980	336,504
Non-PCI Loans \| Consumer lending \| Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	12,675	17,569
Non-PCI Loans \| Consumer lending \| Accruing Loans 30-59 Days Past Due \| Real estate loan \| Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,230	13,269
Non-PCI Loans \| Consumer lending \| Accruing Loans 30-59 Days Past Due \| Home equity lines of credit (“HELOCs”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,421	4,286
Non-PCI Loans \| Consumer lending \| Accruing Loans 30-59 Days Past Due \| Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	24	14
Non-PCI Loans \| Consumer lending \| Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	10,104	9,564
Non-PCI Loans \| Consumer lending \| Accruing Loans 60-89 Days Past Due \| Real estate loan \| Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,733	5,355
Non-PCI Loans \| Consumer lending \| Accruing Loans 60-89 Days Past Due \| Home equity lines of credit (“HELOCs”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,369	4,186
Non-PCI Loans \| Consumer lending \| Accruing Loans 60-89 Days Past Due \| Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2	23
Non-PCI Loans \| Consumer lending \| Accruing Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	16,859	12,325
Non-PCI Loans \| Consumer lending \| Accruing Loans 90 or More Days Past Due \| Real estate loan \| Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	7,459	5,917
Non-PCI Loans \| Consumer lending \| Accruing Loans 90 or More Days Past Due \| Home equity lines of credit (“HELOCs”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	6,909	3,917
Non-PCI Loans \| Consumer lending \| Accruing Loans 90 or More Days Past Due \| Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	2,491	2,491
Non-PCI Loans \| Consumer lending \| Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	32	95
Non-PCI Loans \| Consumer lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Real estate loan \| Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	6	6
Non-PCI Loans \| Consumer lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Home equity lines of credit (“HELOCs”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	26	89
Non-PCI Loans \| Consumer lending \| Nonaccrual Loans Less Than 90 Days Past Due \| Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 0	$ 0

Loans Receivable and Allowance for Credit Losses (Narrative) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Loans in process of foreclosure
Other real estate owned, net	$ 734,000	$ 830,000
Residential real estate properties
Loans in process of foreclosure
Carrying amount of foreclosed residential real estate properties included in total net OREO	0	188,000
Residential
Loans in process of foreclosure
Recorded investment in residential and consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process	8,300,000	6,600,000
PCI Loans
Nonaccrual loans
Loans on nonaccrual status	$ 5,200,000	$ 5,300,000

Loans Receivable and Allowance for Credit Losses (Additions to Non-PCI TDRs) (Details) - Non-PCI Loans $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) loan
Loans Modified as TDRs
Post- Modification Outstanding Recorded Investment	$ 6,419
Commercial lending
Loans Modified as TDRs
Number of Loans \| loan	5
Pre- Modification Outstanding Recorded Investment	$ 8,060
Post- Modification Outstanding Recorded Investment	6,419
Financial Impact	$ 1,273
Commercial lending \| Commercial and industrial (“C&I”)
Loans Modified as TDRs
Number of Loans \| loan	2
Pre- Modification Outstanding Recorded Investment	$ 6,448
Post- Modification Outstanding Recorded Investment	4,914
Financial Impact	$ 1,273
Commercial lending \| Commercial real estate (“CRE”)
Loans Modified as TDRs
Number of Loans \| loan	1
Pre- Modification Outstanding Recorded Investment	$ 1,526
Post- Modification Outstanding Recorded Investment	1,505
Financial Impact	$ 0
Commercial lending \| Construction and land
Loans Modified as TDRs
Number of Loans \| loan	2
Pre- Modification Outstanding Recorded Investment	$ 86
Post- Modification Outstanding Recorded Investment	0
Financial Impact	$ 0

Loans Receivable and Allowance for Credit Losses (Non-PCI TDR Modifications) (Details) - Non-PCI Loans $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	$ 6,419
Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,505
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	4,914
Commercial lending
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	6,419
Commercial lending \| Commercial and industrial (“C&I”)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	4,914
Commercial lending \| Commercial and industrial (“C&I”) \| Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0
Commercial lending \| Commercial and industrial (“C&I”) \| Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	4,914
Commercial lending \| Commercial real estate (“CRE”)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,505
Commercial lending \| Commercial real estate (“CRE”) \| Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,505
Commercial lending \| Commercial real estate (“CRE”) \| Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0
Commercial lending \| Construction and land
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	$ 0

Loans Receivable and Allowance for Credit Losses (Loans Modified as TDRs that Subsequently Defaulted) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Period beyond which a TDR generally becomes delinquent	90 days
Additional funds committed to lend to borrowers whose terms have been modified	$ 2,000		$ 5,100
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan	0	1
Recorded Investment	$ 0	$ 2,718
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan	1	0
Recorded Investment	$ 155	$ 0

Loans Receivable and Allowance for Credit Losses (Non-PCI Impaired Loans) (Details) - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Impaired loans disclosures
Unpaid Principal Balance	$ 206,532		$ 211,442
Recorded Investment With No Allowance	88,232		79,064
Recorded Investment With Allowance	85,499		91,823
Total Recorded Investment	173,731		170,887
Related Allowance	32,319		19,895
Average Recorded Investment	174,314	$ 221,601
Recognized Interest Income	3,315	328
Commercial lending
Impaired loans disclosures
Unpaid Principal Balance	178,781		187,966
Recorded Investment With No Allowance	80,858		76,777
Recorded Investment With Allowance	66,429		72,073
Total Recorded Investment	147,287		148,850
Related Allowance	29,282		16,866
Average Recorded Investment	148,054	201,972
Recognized Interest Income	2,953	294
Commercial lending \| Commercial and industrial (“C&I”)
Impaired loans disclosures
Unpaid Principal Balance	123,336		130,773
Recorded Investment With No Allowance	43,192		36,086
Recorded Investment With Allowance	55,789		62,599
Total Recorded Investment	98,981		98,685
Related Allowance	28,564		16,094
Average Recorded Investment	99,457	143,214
Recognized Interest Income	1,900	221
Commercial lending \| Commercial real estate (“CRE”)
Impaired loans disclosures
Unpaid Principal Balance	40,935		41,248
Recorded Investment With No Allowance	27,210		28,699
Recorded Investment With Allowance	7,706		6,857
Total Recorded Investment	34,916		35,556
Related Allowance	615		684
Average Recorded Investment	35,166	44,772
Recognized Interest Income	868	35
Commercial lending \| Real estate loan \| Multifamily
Impaired loans disclosures
Unpaid Principal Balance	9,819		11,164
Recorded Investment With No Allowance	6,483		8,019
Recorded Investment With Allowance	2,934		2,617
Total Recorded Investment	9,417		10,636
Related Allowance	103		88
Average Recorded Investment	9,458	9,269
Recognized Interest Income	116	38
Commercial lending \| Construction and land
Impaired loans disclosures
Unpaid Principal Balance	4,691		4,781
Recorded Investment With No Allowance	3,973		3,973
Recorded Investment With Allowance	0		0
Total Recorded Investment	3,973		3,973
Related Allowance	0		0
Average Recorded Investment	3,973	4,717
Recognized Interest Income	69	0
Consumer lending
Impaired loans disclosures
Unpaid Principal Balance	27,751		23,476
Recorded Investment With No Allowance	7,374		2,287
Recorded Investment With Allowance	19,070		19,750
Total Recorded Investment	26,444		22,037
Related Allowance	3,037		3,029
Average Recorded Investment	26,260	19,629
Recognized Interest Income	362	34
Consumer lending \| Real estate loan \| Single-family
Impaired loans disclosures
Unpaid Principal Balance	16,983		15,501
Recorded Investment With No Allowance	2,600		0
Recorded Investment With Allowance	13,219		14,338
Total Recorded Investment	15,819		14,338
Related Allowance	541		534
Average Recorded Investment	15,628	15,096
Recognized Interest Income	206	22
Consumer lending \| Home equity lines of credit (“HELOCs”)
Impaired loans disclosures
Unpaid Principal Balance	8,277		5,484
Recorded Investment With No Allowance	4,774		2,287
Recorded Investment With Allowance	3,360		2,921
Total Recorded Investment	8,134		5,208
Related Allowance	5		4
Average Recorded Investment	8,141	4,532
Recognized Interest Income	111	12
Consumer lending \| Other consumer
Impaired loans disclosures
Unpaid Principal Balance	2,491		2,491
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	2,491		2,491
Total Recorded Investment	2,491		2,491
Related Allowance	2,491		$ 2,491
Average Recorded Investment	2,491	1
Recognized Interest Income	$ 45	$ 0

Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for loan losses
Beginning balance	$ 287,128
Ending balance	297,654	$ 263,094
Commercial lending \| Commercial and industrial (“C&I”)
Allowance for loan losses
Beginning balance	163,058
Ending balance	169,695
Commercial lending \| Commercial real estate (“CRE”)
Allowance for loan losses
Beginning balance	41,237
Ending balance	39,718
Commercial lending \| Real estate loan \| Multifamily
Allowance for loan losses
Beginning balance	19,109
Ending balance	18,499
Commercial lending \| Construction and land
Allowance for loan losses
Beginning balance	26,881
Ending balance	32,220
Consumer lending \| Real estate loan \| Single-family
Allowance for loan losses
Beginning balance	26,362
Ending balance	25,957
Consumer lending \| Home equity lines of credit (“HELOCs”)
Allowance for loan losses
Beginning balance	7,354
Ending balance	7,041
Consumer lending \| Other consumer
Allowance for loan losses
Beginning balance	3,127
Ending balance	4,524
Non-PCI Loans
Allowance for loan losses
Beginning balance	287,070	260,402
(Reversal of) provision for loan losses	19,933	8,046
Charge-offs	(18,463)	(7,209)
Recoveries	9,067	1,768
Net recoveries (charge-offs)	(9,396)	(5,441)
Ending balance	297,607	263,007
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Allowance for loan losses
Charge-offs	(18,445)	(7,057)
Recoveries	7,687	455
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
Allowance for loan losses
Recoveries	427	569
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
Allowance for loan losses
Recoveries	333	567
Non-PCI Loans \| Commercial lending \| Construction and land
Allowance for loan losses
Charge-offs	0	(148)
Recoveries	435	24
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family
Allowance for loan losses
Charge-offs	(1)	0
Recoveries	184	11
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Allowance for loan losses
Recoveries	0	24
Non-PCI Loans \| Consumer lending \| Other consumer
Allowance for loan losses
Charge-offs	17	(4)
Recoveries	1	118
PCI Loans
Allowance for loan losses
Beginning balance	58	118
(Reversal of) provision for loan losses	(11)	(31)
Ending balance	47	$ 87
PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Allowance for loan losses
Beginning balance	0
Ending balance	0
PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
Allowance for loan losses
Beginning balance	58
Ending balance	47
PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
Allowance for loan losses
Beginning balance	0
Ending balance	0
PCI Loans \| Commercial lending \| Construction and land
Allowance for loan losses
Beginning balance	0
Ending balance	0
PCI Loans \| Consumer lending \| Real estate loan \| Single-family
Allowance for loan losses
Beginning balance	0
Ending balance	0
PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Allowance for loan losses
Beginning balance	0
Ending balance	0
PCI Loans \| Consumer lending \| Other consumer
Allowance for loan losses
Beginning balance	0
Ending balance	$ 0

Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Unfunded Credit Reserves) (Details) - Allowance for Unfunded Credit Reserves - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for unfunded credit reserves
Allowance for unfunded credit reserves, beginning of period	$ 13,318	$ 16,121
Provision for (reversal of) unfunded credit reserves	296	(947)
Allowance for unfunded credit reserves, end of period	$ 13,614	$ 15,174

Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Allowance for loan losses
Allowance for loan losses	$ 297,654	$ 287,128	$ 263,094
Recorded investment in loans
Loans held-for-investment	29,555,248	28,975,718
Commercial lending
Recorded investment in loans
Loans held-for-investment	22,465,245	22,210,001
Commercial lending \| Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses	169,695	163,058
Recorded investment in loans
Loans held-for-investment	10,818,304	10,697,231
Commercial lending \| Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses	39,718	41,237
Recorded investment in loans
Loans held-for-investment	9,022,746	8,936,897
Commercial lending \| Real estate loan \| Multifamily
Allowance for loan losses
Allowance for loan losses	18,499	19,109
Recorded investment in loans
Loans held-for-investment	1,954,855	1,916,176
Commercial lending \| Construction and land
Allowance for loan losses
Allowance for loan losses	32,220	26,881
Recorded investment in loans
Loans held-for-investment	669,340	659,697
Consumer lending
Recorded investment in loans
Loans held-for-investment	7,090,003	6,765,717
Consumer lending \| Real estate loan \| Single-family
Allowance for loan losses
Allowance for loan losses	25,957	26,362
Recorded investment in loans
Loans held-for-investment	4,930,580	4,646,289
Consumer lending \| Home equity lines of credit (“HELOCs”)
Allowance for loan losses
Allowance for loan losses	7,041	7,354
Recorded investment in loans
Loans held-for-investment	1,775,443	1,782,924
Consumer lending \| Other consumer
Allowance for loan losses
Allowance for loan losses	4,524	3,127
Recorded investment in loans
Loans held-for-investment	383,980	336,504
Non-PCI Loans
Allowance for loan losses
Individually evaluated for impairment	32,319	19,895
Collectively evaluated for impairment	265,288	267,175
Allowance for loan losses	297,607	287,070	263,007	$ 260,402
Recorded investment in loans
Individually evaluated for impairment	173,731	170,887
Collectively evaluated for impairment	28,929,114	28,322,544
Loans held-for-investment	29,102,845	28,493,431
Non-PCI Loans \| Commercial lending
Recorded investment in loans
Loans held-for-investment	22,137,985	21,859,099
Non-PCI Loans \| Commercial lending \| Commercial and industrial (“C&I”)
Allowance for loan losses
Individually evaluated for impairment	28,564	16,094
Collectively evaluated for impairment	141,131	146,964
Recorded investment in loans
Individually evaluated for impairment	98,981	98,685
Collectively evaluated for impairment	10,708,281	10,586,751
Loans held-for-investment	10,807,262	10,685,436
Non-PCI Loans \| Commercial lending \| Commercial real estate (“CRE”)
Allowance for loan losses
Individually evaluated for impairment	615	684
Collectively evaluated for impairment	39,056	40,495
Recorded investment in loans
Individually evaluated for impairment	34,916	35,556
Collectively evaluated for impairment	8,727,994	8,623,653
Loans held-for-investment	8,762,910	8,659,209
Non-PCI Loans \| Commercial lending \| Real estate loan \| Multifamily
Allowance for loan losses
Individually evaluated for impairment	103	88
Collectively evaluated for impairment	18,396	19,021
Recorded investment in loans
Individually evaluated for impairment	9,417	10,636
Collectively evaluated for impairment	1,889,100	1,844,492
Loans held-for-investment	1,898,517	1,855,128
Non-PCI Loans \| Commercial lending \| Construction and land
Allowance for loan losses
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	32,220	26,881
Recorded investment in loans
Individually evaluated for impairment	3,973	3,973
Collectively evaluated for impairment	665,323	655,353
Loans held-for-investment	669,296	659,326
Non-PCI Loans \| Consumer lending
Recorded investment in loans
Loans held-for-investment	6,964,860	6,634,332
Non-PCI Loans \| Consumer lending \| Real estate loan \| Single-family
Allowance for loan losses
Individually evaluated for impairment	541	534
Collectively evaluated for impairment	25,416	25,828
Recorded investment in loans
Individually evaluated for impairment	15,819	14,338
Collectively evaluated for impairment	4,802,275	4,514,573
Loans held-for-investment	4,818,094	4,528,911
Non-PCI Loans \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Allowance for loan losses
Individually evaluated for impairment	5	4
Collectively evaluated for impairment	7,036	7,350
Recorded investment in loans
Individually evaluated for impairment	8,134	5,208
Collectively evaluated for impairment	1,754,652	1,763,709
Loans held-for-investment	1,762,786	1,768,917
Non-PCI Loans \| Consumer lending \| Other consumer
Allowance for loan losses
Individually evaluated for impairment	2,491	2,491
Collectively evaluated for impairment	2,033	636
Recorded investment in loans
Individually evaluated for impairment	2,491	2,491
Collectively evaluated for impairment	381,489	334,013
Loans held-for-investment	383,980	336,504
Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	47	58	$ 87	$ 118
Recorded investment in loans
Loans held-for-investment	452,403	482,287
Acquired with deteriorated credit quality \| Commercial lending
Recorded investment in loans
Loans held-for-investment	327,260	350,902
Acquired with deteriorated credit quality \| Commercial lending \| Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses	0	0
Recorded investment in loans
Loans held-for-investment	11,042	11,795
Acquired with deteriorated credit quality \| Commercial lending \| Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses	47	58
Recorded investment in loans
Loans held-for-investment	259,836	277,688
Acquired with deteriorated credit quality \| Commercial lending \| Real estate loan \| Multifamily
Allowance for loan losses
Allowance for loan losses	0	0
Recorded investment in loans
Loans held-for-investment	56,338	61,048
Acquired with deteriorated credit quality \| Commercial lending \| Construction and land
Allowance for loan losses
Allowance for loan losses	0	0
Recorded investment in loans
Loans held-for-investment	44	371
Acquired with deteriorated credit quality \| Consumer lending
Recorded investment in loans
Loans held-for-investment	125,143	131,385
Acquired with deteriorated credit quality \| Consumer lending \| Real estate loan \| Single-family
Allowance for loan losses
Allowance for loan losses	0	0
Recorded investment in loans
Loans held-for-investment	112,486	117,378
Acquired with deteriorated credit quality \| Consumer lending \| Home equity lines of credit (“HELOCs”)
Allowance for loan losses
Allowance for loan losses	0	0
Recorded investment in loans
Loans held-for-investment	12,657	14,007
Acquired with deteriorated credit quality \| Consumer lending \| Other consumer
Allowance for loan losses
Allowance for loan losses	0	0
Recorded investment in loans
Loans held-for-investment	$ 0	$ 0

Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in accretable yield for PCI loans
Accretable yield for PCI loans, beginning of period	$ 101,977	$ 136,247
Accretion	(9,134)	(10,279)
Changes in expected cash flows	3,021	2,022
Accretable yield for PCI loans, end of period	$ 95,864	$ 127,990

Loans Receivable and Allowance for Credit Losses (Loans Held-for-Sale Activity Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-sale	$ 46,181	$ 85

Loans Receivable and Allowance for Credit Losses (Loans Held-for-Sale Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	$ 155,767	$ 278,024
Sales	114,287	275,945
Purchases	80,046	147,242
Net gains from sales of loans held-for-sale during the period, excluding lower of cost or fair value adjustment	1,600	2,800
C & I and CRE \| Originated
Loans Held-for-Sale
Sales	89,700	29,300
Loans sold in secondary market \| Purchased
Loans Held-for-Sale
Sales	24,600	246,600
Commercial lending \| Commercial and industrial (“C&I”)
Loans Held-for-Sale
Sales	102,365	236,679
Purchases	64,747	147,116
Commercial lending \| Commercial real estate (“CRE”)
Loans Held-for-Sale
Sales	9,376	12,765
Purchases	0	0
Commercial lending \| Real estate loan \| Multifamily
Loans Held-for-Sale
Sales	0	0
Purchases	186	126
Consumer lending \| Real estate loan \| Single-family
Loans Held-for-Sale
Sales	2,546	4,310
Purchases	15,113	0
Consumer lending \| Other consumer
Loans Held-for-Sale
Sales	0	22,191
Purchases	0	0
Loans held-for-sale
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	155,767	278,024
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	85	92
Lower of cost or fair value adjustment		69
Loans held-for-sale \| Commercial lending \| Commercial and industrial (“C&I”)
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	146,391	265,259
Loans held-for-sale \| Commercial lending \| Commercial real estate (“CRE”)
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	9,376	12,765
Loans held-for-sale \| Commercial lending \| Real estate loan \| Multifamily
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	0	0
Loans held-for-sale \| Consumer lending \| Real estate loan \| Single-family
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	0	0
Loans held-for-sale \| Consumer lending \| Other consumer
Loans Held-for-Sale
Loans transferred from held-for-investment to held-for-sale	$ 0	$ 0

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Investments in Qualified Affordable Housing Partnerships, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]
Minimum compliance period for qualified affordable housing partnerships to fully utilize the tax credits (in years)	15 years
Investments in qualified affordable housing partnerships, net	$ 160,574		$ 162,824
Accrued expenses and other liabilities — Unfunded commitments	54,801		$ 55,815
Tax credits and other tax benefits recognized	9,155	$ 9,621
Amortization expense included in income tax expense	$ 7,073	$ 6,950

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Investments in Tax Credit and Other Investments, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments in Tax Credit and Other Investments, Net [Line Items]
Investments in tax credit and other investments, net	$ 246,183		$ 224,551
Marketable equity securities			31,900
Unrealized loss recognized on marketable equity securities held	(454)
Noninterest expense — amortization of tax credit and other investments	17,400	$ 14,360
Investments in tax credit and other investments, net
Investments in Tax Credit and Other Investments, Net [Line Items]
Marketable equity securities	31,000
Accrued expenses and other liabilities
Investments in Tax Credit and Other Investments, Net [Line Items]
Total unfunded commitments for investments in tax credit and other investments	$ 107,800		$ 113,400

Goodwill and Other Intangible Assets (Goodwill and Impairment) (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 465,547,000	$ 465,547,000	$ 469,433,000
Number of reporting units \| segment		3
Goodwill impairment			$ 0
Desert Community Bank
Goodwill [Line Items]
Decrease in goodwill	$ (3,900,000)

Goodwill and Other Intangible Assets (Core Deposit Intangibles) (Details) - Core Deposit Intangibles - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross balance	$ 86,099,000		$ 100,166,000
Accumulated amortization	67,562,000		79,112,000
Net carrying balance	18,537,000		$ 21,054,000
Write-off upon dispositions	0	$ 0
Desert Community Bank
Finite-Lived Intangible Assets [Line Items]
Write-off upon dispositions	$ 1,000,000

Goodwill and Other Intangible Assets (Amortization Expense of Core Deposit Intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,500	$ 1,800
Core Deposit Intangibles
Year Ended December 31,
Remainder of 2018	4,008
2019	4,518
2020	3,634
2021	2,749
2022	1,865
Thereafter	1,763
Net carrying balance	$ 18,537		$ 21,054

Commitments and Contingencies (Credit-related Commitments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 4,818,815	$ 5,075,480
Commercial letters of credit and SBLCs	$ 1,632,585	$ 1,655,897

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Guarantees
Commercial letters of credit and SBLCs	$ 1,632,585	$ 1,655,897
Accrued expenses and other liabilities
Guarantees
Allowance for unfunded credit reserves	13,400	12,700
Other Commitments
Unfunded commitments in investments in qualified affordable housing partnerships, tax credit and other investments	162,600	169,200
Single Family and Multi-family Residential \| Loans Sold or Securitized with Recourse
Guarantees
Principal amount outstanding on loans sold or securitized	108,700	113,700
Maximum potential future payments up to recourse component	37,800	38,700
Single Family and Multi-family Residential \| Loans Sold or Securitized with Recourse \| Accrued expenses and other liabilities
Guarantees
Allowance for unfunded credit reserves	200	$ 214
Standby Letters of Credit
Guarantees
Commercial letters of credit and SBLCs	1,570,000
Commercial Letters of Credit
Guarantees
Commercial letters of credit and SBLCs	$ 60,500

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 13,383	$ 14,259
Other sources of noninterest income	61,061	101,569
Total noninterest income	74,444	115,828
Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,880	10,110
Other sources of noninterest income	34,568	3,454
Total noninterest income	44,448	13,564
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,345	4,044
Other sources of noninterest income	24,093	21,690
Total noninterest income	27,438	25,734
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	105
Other sources of noninterest income	2,400	76,425
Total noninterest income	2,558	76,530
Deposit service charges and related fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,186	8,684
Deposit service charges and related fee income \| Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,014	5,837
Deposit service charges and related fee income \| Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,014	2,742
Deposit service charges and related fee income \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	105
Card income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,244	1,240
Card income \| Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,070	1,027
Card income \| Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	174	213
Card income \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,953	4,335
Wealth management fees \| Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,796	3,246
Wealth management fees \| Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	157	1,089
Wealth management fees \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0

Stock Compensation Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0	0
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	0	0
RSUs \| Ratably
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSUs \| Cliff \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSUs \| Cliff \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	411,290	424,299
Total unrecognized compensation cost	$ 26.0
Weighted average period to recognize unrecognized compensation cost	2 years 4 months 13 days
Performance-Based RSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	0.00%
Performance-Based RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	200.00%
Performance-Based RSUs \| Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	1,214,611	1,166,580
Total unrecognized compensation cost	$ 46.8
Weighted average period to recognize unrecognized compensation cost	2 years 5 months 8 days

Stock Compensation Plans (Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]
Stock compensation costs	$ 6,158	$ 5,151
Related net tax benefits for stock compensation plans	$ 4,778	$ 4,414

Stock Compensation Plans (Summary of Activity for Time-Based and Performance-Based RSUs) (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Time-Based RSUs
Shares
Outstanding, beginning of period (in shares) \| shares	1,166,580
Granted (in shares) \| shares	389,667
Vested (in shares) \| shares	(312,413)
Forfeited (in shares) \| shares	(29,223)
Outstanding, end of period (in shares) \| shares	1,214,611
Weighted-Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 42.00
Granted (in dollars per share) \| $ / shares	67.32
Vested (in dollars per share) \| $ / shares	39.97
Forfeited (in dollars per share) \| $ / shares	44.62
Outstanding, end of period (in dollars per share) \| $ / shares	$ 50.58
Performance-Based RSUs
Shares
Outstanding, beginning of period (in shares) \| shares	424,299
Granted (in shares) \| shares	120,286
Vested (in shares) \| shares	(133,295)
Forfeited (in shares) \| shares	0
Outstanding, end of period (in shares) \| shares	411,290
Weighted-Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 41.44
Granted (in dollars per share) \| $ / shares	70.13
Vested (in dollars per share) \| $ / shares	41.15
Forfeited (in dollars per share) \| $ / shares	0.00
Outstanding, end of period (in dollars per share) \| $ / shares	$ 49.93

Stockholders' Equity and Earnings Per Share (Warrants) (Details) - shares	Mar. 31, 2018	Jan. 17, 2014	Jan. 16, 2014
Class of Stock [Line Items]
Number of warrants exercised (in warrants)	0
Common Stock
Class of Stock [Line Items]
Shares of East West's common stock into which the warrant may be converted (in shares)		230,282
MetroCorp \| MetroCorp
Class of Stock [Line Items]
Shares of East West's common stock into which the warrant may be converted (in shares)			771,429

Stockholders' Equity and Earnings Per Share (Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic
Net income	$ 187,032	$ 169,736
Basic weighted average number of shares outstanding (in shares)	144,664	144,249
Basic EPS (in dollars per share)	$ 1.29	$ 1.18
Diluted
Net income	$ 187,032	$ 169,736
Basic weighted average number of shares outstanding (in shares)	144,664	144,249
Diluted potential common shares (in shares)	1,275	1,483
Diluted weighted average number of shares outstanding (in shares)	145,939	145,732
Diluted EPS (in dollars per share)	$ 1.28	$ 1.16

Stockholders' Equity and Earnings Per Share (Weighted Average Anti-dilutive Shares) (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average anti-dilutive shares (in shares)	177,807	193,916

Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Dec. 31, 2017

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

$ 3,841,951

$ 3,427,741

Cumulative effect of change in accounting principle related to marketable equity securities

^[1]

$ (160)

Net unrealized (losses) gains arising during the period

(10,513)

6,062

Amounts reclassified from AOCI

(1,501)

(1,434)

Other comprehensive (loss) income

(12,014)

4,628

Ending balance

3,978,755

3,565,954

Available- for-Sale Investment Securities

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

(30,898)

(28,772)

Net unrealized (losses) gains arising during the period

(17,311)

5,055

Amounts reclassified from AOCI

(1,501)

(1,434)

Other comprehensive (loss) income

(18,812)

3,621

Ending balance

(55,981)

(25,151)

Available- for-Sale Investment Securities | ASU 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of change in accounting principle related to marketable equity securities

385

Available- for-Sale Investment Securities | ASU 2018-02

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate

(6,656)

Foreign Currency Translation Adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

(6,621)

(19,374)

Net unrealized (losses) gains arising during the period

6,798

1,007

Amounts reclassified from AOCI

0

Other comprehensive (loss) income

6,798

1,007

Ending balance

177

(18,367)

AOCI, Net of Tax

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

(37,519)

(48,146)

Cumulative effect of change in accounting principle related to marketable equity securities

^[1]

385

Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate

^[2]

(6,656)

Other comprehensive (loss) income

(12,014)

4,628

Ending balance

(55,804)

$ (43,518)

AOCI, Net of Tax | ASU 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of change in accounting principle related to marketable equity securities

$ 385

AOCI, Net of Tax | ASU 2018-02

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate

$ (6,656)

[1]

Represents the impact of the adoption in the first quarter of 2018 of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

[2]

Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income during the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Before-Tax
Net change	$ (19,908)	$ 7,254
Tax Effect
Net change	7,894	(2,626)
Net-of-Tax
Net unrealized (losses) gains arising during the period	(10,513)	6,062
Net realized gains reclassified into net income	(1,501)	(1,434)
Other comprehensive (loss) income	(12,014)	4,628
Available- for-Sale Investment Securities
Before-Tax
Net unrealized (losses) gains arising during the period	(24,577)	8,721
Net realized gains reclassified into net income	(2,129)	(2,474)
Net change	(26,706)	6,247
Tax Effect
Net unrealized (losses) gains arising during the period	7,266	(3,666)
Net realized gains reclassified into net income	628	1,040
Net change	7,894	(2,626)
Net-of-Tax
Net unrealized (losses) gains arising during the period	(17,311)	5,055
Net realized gains reclassified into net income	(1,501)	(1,434)
Other comprehensive (loss) income	(18,812)	3,621
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized (losses) gains arising during the period	6,798	1,007
Net change	6,798	1,007
Tax Effect
Net unrealized (losses) gains arising during the period	0	0
Net change	0	0
Net-of-Tax
Net unrealized (losses) gains arising during the period	6,798	1,007
Net realized gains reclassified into net income	0	0
Other comprehensive (loss) income	$ 6,798	$ 1,007

Business Segments (Narrative) (Details)	3 Months Ended
Business Segments (Narrative) (Details)	Mar. 31, 2018 segment business_division
Segment Reporting [Abstract]
Number of operating segments	3
Number of business segments \| business_division	3
Number of segment whom broad administrative support are provided	2

Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information
Interest income	$ 371,873	$ 302,669
Charge for funds used	(178,966)	(120,414)
Interest spread on funds used	192,907	182,255
Interest expense	(45,180)	(30,547)
Credit on funds provided	178,966	120,414
Interest spread on funds provided (used)	133,786	89,867
Net interest income before provision for credit losses	326,693	272,122
Provision for credit losses	20,218	7,068
Noninterest income	74,444	115,828
Noninterest expense	169,135	152,878
Segment income (loss) before income taxes	211,784	228,004
Segment income after income taxes	187,032	169,736
Segment assets	37,693,158	35,342,126	$ 37,150,249
Retail Banking
Segment Reporting Information
Interest income	104,710	81,025
Charge for funds used	(49,273)	(27,738)
Interest spread on funds used	55,437	53,287
Interest expense	(24,940)	(16,183)
Credit on funds provided	145,451	102,546
Interest spread on funds provided (used)	120,511	86,363
Net interest income before provision for credit losses	175,948	139,650
Provision for credit losses	3,093	378
Noninterest income	44,448	13,564
Noninterest expense	81,968	72,844
Segment income (loss) before income taxes	135,335	79,992
Segment income after income taxes	96,968	47,035
Segment assets	9,345,892	8,213,268
Commercial Banking
Segment Reporting Information
Interest income	239,577	192,419
Charge for funds used	(111,366)	(64,509)
Interest spread on funds used	128,211	127,910
Interest expense	(9,179)	(5,098)
Credit on funds provided	25,448	12,043
Interest spread on funds provided (used)	16,269	6,945
Net interest income before provision for credit losses	144,480	134,855
Provision for credit losses	17,125	6,690
Noninterest income	27,438	25,734
Noninterest expense	65,020	54,373
Segment income (loss) before income taxes	89,773	99,526
Segment income after income taxes	64,362	58,796
Segment assets	21,992,393	19,624,237
Other
Segment Reporting Information
Interest income	27,586	29,225
Charge for funds used	(18,327)	(28,167)
Interest spread on funds used	9,259	1,058
Interest expense	(11,061)	(9,266)
Credit on funds provided	8,067	5,825
Interest spread on funds provided (used)	(2,994)	(3,441)
Net interest income before provision for credit losses	6,265	(2,383)
Provision for credit losses	0	0
Noninterest income	2,558	76,530
Noninterest expense	22,147	25,661
Segment income (loss) before income taxes	(13,324)	48,486
Segment income after income taxes	25,702	63,905
Segment assets	$ 6,354,873	$ 7,504,621

Subsequent Events (Details) - $ / shares			3 Months Ended
Subsequent Events (Details) - $ / shares	May 15, 2018	Apr. 19, 2018	Mar. 31, 2018	Mar. 31, 2017
Subsequent events
Dividends declared per common share (in dollars per share)			$ 0.20	$ 0.20
Subsequent Event
Subsequent events
Dividends declared per common share (in dollars per share)		$ 0.20
Subsequent Event \| Forecast
Subsequent events
Dividends paid per common share (in dollars per share)	$ 0.20