Document And Entity Information - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Jun. 30, 2016 |
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| Document and Entity Information [Abstract] | ||
| Entity Registrant Name | BOK FINANCIAL CORP ET AL | |
| Entity Central Index Key | 0000875357 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Well-known Seasoned Issuer | Yes | |
| Entity Voluntary Filers | No | |
| Entity Current Reporting Status | Yes | |
| Entity Filer Category | Large Accelerated Filer | |
| Entity Public Float | $ 1,588,744,146 | |
| Entity Common Stock, Shares Outstanding | 65,408,019 | |
| Document Fiscal Year Focus | 2017 | |
| Document Fiscal Period Focus | Q1 | |
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Mar. 31, 2017 |
Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|||
| Statement of Comprehensive Income [Abstract] | ||||
| Net income | $ 88,664 | $ 40,988 | ||
| Other comprehensive income before income taxes: | ||||
| Net change in unrealized gain (loss) | 11,411 | 121,091 | ||
| Reclassification adjustments included in earnings: | ||||
| Interest revenue, Investment securities, Taxable securities | 0 | (69) | ||
| Gain on available for sale securities, net | (2,049) | (3,964) | ||
| Other comprehensive income before income taxes | 9,362 | 117,058 | ||
| Federal and state income taxes | [1] | 3,616 | 45,536 | |
| Other comprehensive income, net of income taxes | 5,746 | 71,522 | ||
| Comprehensive income | 94,410 | 112,510 | ||
| Comprehensive income (loss) attributable to non-controlling interests | 308 | (1,576) | ||
| Comprehensive income attributable to BOK Financial Corp. shareholders | $ 94,102 | $ 114,086 | ||
| ||||
Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|---|---|---|---|
| Assets [Abstract] | |||
| Cash and due from banks | $ 546,575 | $ 620,846 | $ 481,510 |
| Interest-bearing cash and cash equivalents | 2,220,640 | 1,916,651 | 1,831,162 |
| Trading securities | 677,156 | 337,628 | 279,539 |
| Investment securities | 519,402 | 546,145 | 576,047 |
| Available for sale securities | 8,437,291 | 8,676,829 | 8,886,036 |
| Fair value option securities | 441,714 | 77,046 | 418,887 |
| Restricted equity securities | 283,936 | 307,240 | 314,590 |
| Residential mortgage loans held for sale | 248,707 | 301,897 | 332,040 |
| Loans | 16,991,906 | 16,989,660 | 16,022,566 |
| Allowance for loan losses | (248,710) | (246,159) | (233,156) |
| Loans, net of allowance | 16,743,196 | 16,743,501 | 15,789,410 |
| Premises and equipment, net | 325,546 | 325,849 | 311,161 |
| Receivables | 394,394 | 772,952 | 167,209 |
| Goodwill | 445,738 | 448,899 | 383,789 |
| Intangible assets, net | 42,556 | 46,931 | 44,944 |
| Mortgage servicing rights | 249,403 | 247,073 | 196,055 |
| Real estate and other repossessed assets, net of allowance | 42,726 | 44,287 | 29,896 |
| Derivative contracts, net | 304,727 | 689,872 | 790,146 |
| Cash surrender value of bank-owned life insurance | 310,537 | 308,430 | 305,510 |
| Receivable on unsettled securities sales | 9,921 | 7,188 | 5,640 |
| Other assets | 384,767 | 353,017 | 270,374 |
| Total assets | 32,628,932 | 32,772,281 | 31,413,945 |
| Deposits [Abstract] | |||
| Noninterest-bearing demand deposits | 9,506,573 | 9,235,720 | 7,950,675 |
| Interest-bearing deposits: [Abstract] | |||
| Transaction | 10,359,214 | 10,865,105 | 9,709,766 |
| Savings | 465,724 | 425,470 | 416,505 |
| Time | 2,243,848 | 2,221,800 | 2,341,374 |
| Total deposits | 22,575,359 | 22,748,095 | 20,418,320 |
| Funds purchased | 47,629 | 57,929 | 62,755 |
| Repurchase agreements | 508,352 | 668,661 | 630,101 |
| Other borrowings | 5,238,947 | 4,846,072 | 5,633,862 |
| Subordinated debentures | 144,649 | 144,640 | 226,385 |
| Accrued interest, taxes and expense | 140,235 | 146,704 | 148,711 |
| Derivative contracts, net | 276,422 | 664,531 | 705,578 |
| Due on unsettled securities purchases | 137,069 | 6,508 | 19,508 |
| Other liabilities | 189,376 | 182,784 | 212,460 |
| Total liabilities | 29,258,038 | 29,465,924 | 28,057,680 |
| Shareholders' equity: [Abstract] | |||
| Common stock | 4 | 4 | 4 |
| Capital surplus | 1,009,360 | 1,006,535 | 987,046 |
| Retained earnings | 2,883,042 | 2,823,334 | 2,718,301 |
| Treasury stock | (545,441) | (544,052) | (476,905) |
| Accumulated other comprehensive income (loss) | (5,221) | (10,967) | 93,109 |
| Total shareholders’ equity | 3,341,744 | 3,274,854 | 3,321,555 |
| Non-controlling interests | 29,150 | 31,503 | 34,710 |
| Total equity | 3,370,894 | 3,306,357 | 3,356,265 |
| Total liabilities and equity | $ 32,628,932 | $ 32,772,281 | $ 31,413,945 |
Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|---|---|---|---|
| Investment securities [Abstract] | |||
| Investment Securities, fair value | $ 540,663 | $ 565,493 | $ 609,743 |
| Allowance for real estate and other repossessed assets | $ 9,065 | $ 9,562 | $ 11,913 |
| Shareholders' equity: [Abstract] | |||
| Common stock, par value (in dollars per share) | $ 0.00006 | $ 0.00006 | $ 0.00006 |
| Common stock, shares authorized (in shares) | 2,500,000,000 | 2,500,000,000 | 2,500,000,000 |
| Common stock, shares issued (in shares) | 75,080,768 | 74,993,407 | 74,800,772 |
| Common stock, shares outstanding (in shares) | 75,080,768 | 74,993,407 | 74,800,772 |
| Treasury stock, shares at cost (in shares) | 9,672,749 | 9,655,975 | 8,645,669 |
Significant Accounting Policies |
3 Months Ended |
|---|---|
Mar. 31, 2017 | |
| Accounting Policies [Abstract] | |
| Significant Accounting Policies [Text Block] | Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated financial statements of BOK Financial Corporation (“BOK Financial” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The unaudited consolidated financial statements include accounts of BOK Financial and its subsidiaries, principally BOKF, NA (“the Bank”), BOK Financial Securities, Inc., The Milestone Group, Inc. and Cavanal Hill Investment Management Inc. Operating divisions of the Bank include Bank of Albuquerque, Bank of Arizona, Bank of Arkansas, Bank of Oklahoma, Bank of Texas, Colorado State Bank and Trust, Mobank, BOK Financial Mortgage and the TransFund electronic funds network. Certain reclassifications have been made to conform to the current period presentation. The financial information should be read in conjunction with BOK Financial’s 2016 Form 10-K filed with the Securities and Exchange Commission, which contains audited financial statements. Amounts presented as of December 31, 2016 have been derived from the audited financial statements included in BOK Financial’s 2016 Form 10-K but do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. Operating results for the three-month period ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. Newly Adopted and Pending Accounting Policies Financial Accounting Standards Board (“FASB”) FASB Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09") On May 28, 2014, the FASB issued ASU 2014-09 to clarify the principles for recognizing revenue by providing a more robust framework that will give greater consistency and comparability in revenue recognition practices. In the new framework, an entity recognizes revenue in an amount that reflects the consideration to which the entity expects to be entitled in exchange for goods or services. The new model requires the identification of performance obligations included in contracts with customers, a determination of the transaction price and an allocation of the price to those performance obligations. The entity recognizes revenue when performance obligations are satisfied. ASU 2014-09 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Net interest revenue from financial assets and liabilities is explicitly excluded from the scope of ASU 2014-09. Management expects that most fees and commissions revenue will not be affected. The Company continues to evaluate the impact of ASU 2014-09 on Fiduciary and Asset Management Revenue and Transaction Card Revenue, which represents 18% of gross revenue and 39% of fees and commissions revenue for 2016. Timing of revenue recognition and gross versus net presentation may be affected. Management expects to adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings if such adjustment is significant. FASB Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08") On March 17, 2016, the FASB Issued ASU 2016-08 to amend the principal versus agent implementation guidance in ASU 2014-09. The ASU clarifies that an entity should evaluate whether it is the principal or the agent for each specified good or service promised in a contract with a customer. ASU 2016-08 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is evaluating the impact the adoption of ASU 2016-08 will have on the Company's financial statements along with ASU 2014-09. FASB Accounting Standards Update No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10") On April 14, 2016, the FASB issued ASU 2016-10 which amends certain sections of ASU 2014-09 related to identifying performance obligations and licensing implementation. ASU 2016-10 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is evaluating the impact the adoption of ASU 2016-10 will have on the Company's financial statements along with ASU 2014-09. FASB Accounting Standards Update No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ("ASU 2016-12") On May 9, 2016, the FASB issued ASU 2016-12, which amends certain aspects of the Board's new revenue standard, ASU 2014-09. The amendments clarify information regarding collectability, presentation of sales tax and other similar taxes collected from customers, non-cash consideration, contract modifications and completed contracts at transition, and transition disclosures. ASU 2016-12 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is evaluating the impact the adoption of ASU 2016-12 will have on the Company's financial statements along with ASU 2014-09. FASB Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01") On January 5, 2016, the FASB issued ASU 2016-01 over the recognition and measurement of financial assets and liabilities. The update requires equity investments, in general, to be measured at fair value with changes in fair value recognized in earnings. It also eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, requires entities to use the exit price notion when measuring fair value, requires an entity to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from a change in the instrument-specific credit risk when the fair value option has been elected, requires separate presentation of financial assets and liabilities by measurement category and form on the balance sheet or accompanying notes, clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets, and simplifies the impairment assessment of equity investments without readily determinable fair values. The ASU is effective for the Company for interim and annual periods beginning after December 15, 2017. Upon adoption, unrealized gains and losses from equity securities will be reclassified from other comprehensive income to retained earnings. At March 31, 2017, the Company had $3.1 million of unrealized gains included in accumulated other comprehensive income. FASB Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02") On February 25, 2016, the FASB issued ASU 2016-02 to increase transparency and comparability by recognizing lease assets and liabilities on the balance sheet and disclosing key information about leasing arrangements. Lessees will be required to recognize an obligation for future lease payments measured on a discounted basis and a right-of-use asset. The ASU is effective for the Company for interim and annual periods beginning after December 15, 2018 and requires transition through a modified retrospective approach for leases existing at or entered into after January 1, 2017. The Company is evaluating the impact the adoption of ASU 2016-02 will have on the Company's financial statements. FASB Accounting Standards Update No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09") On March 30, 2016, the FASB issued ASU 2016-09 to simplify multiple aspects of accounting for employee share-based payment transactions including accounting income taxes, forfeitures, and statutory tax withholding requirements. The ASU became effective for annual reporting periods beginning after December 15, 2016, including interim periods within those annual reporting periods. Implementation of ASU 2016-09 decreased tax expense $3.9 million in the first quarter of 2017. FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Assets Measured at Amortized Cost ("ASU 2016-13") On June 16, 2016, the FASB issued ASU 2016-13 in order to provide more timely recording of credit losses on loans and other financial instruments. The ASU adds an impairment model (known as the current expected credit loss ("CECL") model) that is based on expected credit losses rather than incurred credit losses. It requires measurement of all expected credit losses for financial assets carried at amortized cost, including loans and investment securities, based on historical experience, current conditions, and reasonable and supportable forecasts. ASU 2016-13 also changes the recognition of other-than-temporary impairment of available for sale securities to an allowance methodology from a direct write-down methodology. ASU 2016-13 will be effective for the Company for annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for annual reporting periods beginning after December 15, 2018. ASU 2016-13 will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company is evaluating the impact the adoption of ASU 2016-13 will have on the Company's financial statements. FASB Accounting Standards Update No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") On August 26, 2016, the FASB issued ASU 2016-15, which amends guidance in ASC 230 on the classification of certain cash receipts and payments in the statement of cash flows. The amendments address eight cash flow issues. ASU 2016-15 is effective for the Company for interim and annual reporting periods beginning after December 15, 2017. Entities generally must apply the guidance retrospectively to all periods presented. Adoption of ASU 2016-15 did not have a material impact on the Company's financial statements. |
Securities |
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| Marketable Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Securities [Text Block] | Securities Trading Securities The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands):
Investment Securities The amortized cost and fair values of investment securities are as follows (in thousands):
The amortized cost and fair values of investment securities at March 31, 2017, by contractual maturity, are as shown in the following table (dollars in thousands):
Available for Sale Securities The amortized cost and fair value of available for sale securities are as follows (in thousands):
1 Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet. 2 Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.
1 Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet. 2 Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.
The amortized cost and fair values of available for sale securities at March 31, 2017, by contractual maturity, are as shown in the following table (dollars in thousands):
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
A summary of investment and available for sale securities that have been pledged as collateral for repurchase agreements, public trust funds on deposit and for other purposes, as required by law was as follows (in thousands):
The secured parties do not have the right to sell or re-pledge these securities. Temporarily Impaired Securities as of March 31, 2017 (in thousands):
Temporarily Impaired Securities as of December 31, 2016 (In thousands)
Temporarily Impaired Securities as of March 31, 2016 (In thousands)
For debt securities, management determines whether it intends to sell or if it is more-likely-than-not that it will be required to sell impaired securities. This determination considers current and forecasted liquidity requirements, regulatory and capital requirements and securities portfolio management. Based on this evaluation as of March 31, 2017, the Company does not intend to sell any impaired available for sale securities before fair value recovers to the current amortized cost and it is more-likely-than-not that the Company will not be required to sell impaired securities before fair value recovers, which may be maturity. At March 31, 2017, the entire portfolio of privately issued residential mortgage-backed securities was rated below investment grade by the nationally-recognized rating agencies. The gross unrealized loss on these securities totaled $78 thousand. Impairment of these securities was evaluated based on projections of estimated cash flows. The primary assumptions used in this evaluation were:
No credit loss impairments were recognized in earnings on privately issued residential mortgage-backed securities during the three months ended March 31, 2017. Impaired equity securities, including perpetual preferred stocks, are evaluated based on management's ability and intent to hold the securities until fair value recovers. Based on this evaluation, no other-than-temporary impairment loss related to equity securities was recorded to earnings during the three months ended March 31, 2017. The following is a tabular roll forward of the amount of credit-related OTTI recognized on available for sale debt securities in earnings (in thousands):
Additions above exclude other-than-temporary impairment recorded due to change in intent to hold before recovery. Fair Value Option Securities Fair value option securities represent securities which the Company has elected to carry at fair value and are separately identified on the Consolidated Balance Sheets. Changes in the fair value are recognized in earnings as they occur. Certain U.S. Treasury securities, residential mortgage-backed securities issued by U.S. government agencies and derivative contracts are held as an economic hedge of the mortgage servicing rights. The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands):
Restricted Equity Securities Restricted equity securities primarily include stock we are required to hold as members of the Federal Reserve system and the Federal Home Loan Banks. Restricted equity securities are carried at cost as these securities do not have a readily determined fair value because ownership of these shares are restricted and they lack a market. A summary of restricted equity securities follows (in thousands):
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Derivatives |
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| Derivative Instrument Detail [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivatives [Text Block] | Derivatives Derivative instruments may be used by the Company as part of its internal risk management programs or may be offered to customers. All derivative instruments are carried at fair value and changes in fair value are reported in earnings as they occur. Credit risk is also considered in determining fair value. When bilateral netting agreements or similar arrangements exist between the Company and its counterparties that create a single legal claim or obligation to pay or receive the net amount in settlement of the individual derivative contracts, the Company reports derivative assets and liabilities on a net by derivative contract type by counterparty basis. Derivative contracts may require the Company to provide or receive cash margin as collateral for derivative assets and liabilities. Derivative assets and liabilities are reported net of cash margin when certain conditions are met. In addition, derivative contracts executed with customers under Customer Risk Management Programs may be secured by non-cash collateral in conjunction with a credit agreement with that customer. Access to collateral, in the event of default is reasonably assured. As of March 31, 2017, a decrease in BOK Financial's credit rating to below investment grade would increase our obligation to post cash margin on existing contracts by approximately $10 million. None of these derivative contracts have been designated as hedging instruments for accounting purposes. Customer Risk Management Programs BOK Financial offers programs to permit its customers to manage various risks, including fluctuations in energy, cattle and other agricultural products, interest rates and foreign exchange rates with derivative contracts. Customers may also manage interest rate risk through interest rate swaps used by borrowers to modify interest rate terms of their loans or to-be-announced securities used by mortgage banking customers to hedge their loan production. Derivative contracts are executed between the customers and BOK Financial. Offsetting contracts are executed between BOK Financial and other selected counterparties to minimize the risk of changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to BOK Financial as profit and compensation for administrative costs and credit risk which is recognized over the life of the contracts and included in other operating revenue – brokerage and trading revenue in the Consolidated Statements of Earnings. Internal Risk Management Programs BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change in the fair value of mortgage servicing rights and as an economic hedge of trading securities. As of March 31, 2017, derivative contracts under the internal risk management programs were primarily used as part of the economic hedges of the change in the fair value of the mortgage servicing rights and trading securities. As discussed in Note 6, certain derivative contracts not designated as hedging instruments related to mortgage loan commitments and forward sales contracts are included in Residential mortgage loans held for sale on the Consolidated Balance Sheets. See Note 6 for additional discussion of notional, fair value and impact on earnings of these contracts. The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at March 31, 2017 (in thousands):
The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2016 (in thousands):
The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at March 31, 2016 (in thousands):
The following summarizes the pre-tax net gains (losses) on derivative instruments and where they are recorded in the income statement (in thousands):
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Loans and Allowances for Credit Losses |
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| Loans Receivable, Net [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans [Text Block] | Loans and Allowances for Credit Losses Loans Loans are either secured or unsecured based on the type of loan and the financial condition of the borrower. Repayment is generally expected from cash flow or proceeds from the sale of selected assets of the borrower. BOK Financial is exposed to risk of loss on loans due to the borrower’s difficulties, which may arise from any number of factors, including problems within the respective industry or local economic conditions. Access to collateral, in the event of borrower default, is reasonably assured through adherence to applicable lending laws and through sound lending standards and credit review procedures. Accounting policies for all loans, excluding residential mortgage loans guaranteed by U.S. government agencies, are as follows. Interest is accrued at the applicable interest rate on the principal amount outstanding. Loans are placed on nonaccruing status when, in the opinion of management, full collection of principal or interest is uncertain. Internally risk graded loans are individually evaluated for nonaccruing status quarterly. Non-risk graded loans are generally placed on nonaccruing status when more than 90 days past due or within 60 days of being notified of the borrower's bankruptcy filing. Interest previously accrued but not collected is charged against interest income when the loan is placed on nonaccruing status. Payments on nonaccruing loans are applied to principal or recognized as interest income, according to management’s judgment as to the collectability of principal. Loans may be returned to accruing status when, in the opinion of management, full collection of principal and interest, including principal previously charged off, is probable based on improvements in the borrower’s financial condition or a sustained period of performance. Loans to borrowers experiencing financial difficulties may be modified in troubled debt restructurings ("TDRs"). All TDRs are classified as nonaccruing, excluding loans guaranteed by U.S. government agencies. Modifications generally consist of extension of payment terms or interest rate concessions and may result either voluntarily through negotiations with the borrower or involuntarily through court order. Generally, principal and accrued but unpaid interest is not voluntarily forgiven. Performing loans may be renewed under the current collateral value, debt service ratio and other underwriting standards. Nonaccruing loans may be renewed and will remain classified as nonaccruing. All loans are charged off when the loan balance or a portion of the loan balance is no longer supported by the paying capacity of the borrower or when the required cash flow is reduced in a TDR. The charge-off amount is determined through a quarterly evaluation of available cash resources and collateral value and charge-offs are taken in the quarter in which the loss is identified. Non-risk graded loans that are past due between 60 days and 180 days, based on the loan product type, are charged off. Loans to borrowers whose personal obligation has been discharged through Chapter 7 bankruptcy proceedings are charged off within 60 days of notice of the bankruptcy filing, regardless of payment status. Loan origination and commitment fees and direct loan acquisition and origination costs are deferred and amortized as an adjustment to yield over the life of the loan or over the commitment period, as applicable. Qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. Under certain performance conditions specified in government programs, the Company may have the right, but not the obligation to repurchase loans from GNMA pools. These loans no longer qualify for sale accounting and are recognized in the Consolidated Balance Sheets. Guaranteed loans are considered impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. The principal balance continues to be guaranteed; however, interest accrues at a curtailed rate as specified in the programs. The carrying value of these loans is reduced based on an estimate of the expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in TDRs in accordance with U.S. government agency guidelines. Interest continues to accrue based on the modified rate. Guaranteed loans may either be resold into GNMA pools after a performance period specified by the programs or foreclosed and conveyed to the guarantors. Loans are disaggregated into portfolio segments and further disaggregated into classes. The portfolio segment is the level at which the Company develops and documents a systematic method for determining its allowance for credit losses. Classes are a further disaggregation of portfolio segments based on the risk characteristics of the loans and the Company’s method for monitoring and assessing credit risk. Portfolio segments of the loan portfolio are as follows (in thousands):
At March 31, 2017, $5.5 billion or 33 percent of our total loan portfolio is to businesses and individuals attributed to the Texas market and $3.3 billion or 20 percent of the total loan portfolio is to businesses and individuals attributed to the Oklahoma market. These geographic concentrations subject the loan portfolio to the general economic conditions within these areas. Commercial Commercial loans represent loans for working capital, facilities acquisition or expansion, purchases of equipment and other needs of commercial customers primarily located within our geographical footprint. Commercial loans are underwritten individually and represent on-going relationships based on a thorough knowledge of the customer, the customer’s industry and market. While commercial loans are generally secured by the customer’s assets including real property, inventory, accounts receivable, operating equipment, interest in mineral rights and other property and may also include personal guarantees of the owners and related parties, the primary source of repayment of the loans is the on-going cash flow from operations of the customer’s business. Inherent lending risk is centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with commercial lending policies. At March 31, 2017, commercial loans attributed to the Texas market totaled $3.4 billion or 33 percent of the commercial loan portfolio segment and commercial loans attributed to the Oklahoma market totaled $1.9 billion or 19 percent of the commercial loan portfolio segment. The commercial loan portfolio segment is further divided into loan classes. The energy loan class totaled $2.5 billion or 15 percent of total loans at March 31, 2017, including $2.0 billion of outstanding loans to energy producers. Approximately 58 percent of committed production loans are secured by properties primarily producing oil and 42 percent are secured by properties producing natural gas. The services loan class totaled $3.0 billion or 18 percent of total loans at March 31, 2017. Approximately $1.4 billion of loans in the services category consist of loans with individual balances of less than $10 million. Businesses included in the services class include governmental, finance and insurance, not-for-profit, educational services and loans to entities providing services for real estate and construction. The healthcare loan class totaled $2.3 billion or 13 percent of total loans at March 31, 2017. The healthcare loan class consists primarily of loans for the development and operation of senior housing and care facilities, including independent living, assisted living and skilled nursing. Healthcare also includes loans to hospitals and other medical service providers. Commercial Real Estate Commercial real estate loans are for the construction of buildings or other improvements to real estate and property held by borrowers for investment purposes primarily within our geographical footprint. We require collateral values in excess of the loan amounts, demonstrated cash flows in excess of expected debt service requirements, equity investment in the project and a portion of the project already sold, leased or permanent financing already secured. The expected cash flows from all significant new or renewed income producing property commitments are stress tested to reflect the risks in varying interest rates, vacancy rates and rental rates. As with commercial loans, inherent lending risks are centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with applicable lending policies. At March 31, 2017, 31 percent of commercial real estate loans are secured by properties primarily located in the Dallas and Houston areas of Texas. An additional 12 percent of commercial real estate loans are secured by properties located primarily in the Tulsa and Oklahoma City metropolitan areas of Oklahoma. Residential Mortgage and Personal Residential mortgage loans provide funds for our customers to purchase or refinance their primary residence or to borrow against the equity in their home. Residential mortgage loans are secured by a first or second mortgage on the customer’s primary residence. Personal loans consist primarily of loans secured by the cash surrender value of insurance policies and marketable securities. It also includes direct loans secured by and for the purchase of automobiles, recreational and marine equipment as well as unsecured loans. Residential mortgage and personal loans are made in accordance with underwriting policies we believe to be conservative and are fully documented. Loans may be individually underwritten or credit scored based on size and other criteria. Credit scoring is assessed based on significant credit characteristics including credit history, residential and employment stability. Residential mortgage loans retained in the Company’s portfolio are primarily composed of various mortgage programs to support customer relationships including jumbo mortgage loans, non-builder construction loans and special loan programs for high net worth individuals and certain professionals. Jumbo loans may be fixed or variable rate and are fully amortizing. Jumbo loans generally conform to government sponsored entity standards, except that the loan size exceeds maximums required under these standards. These loans generally require a minimum FICO score of 720 and a maximum debt-to-income ratio (“DTI”) of 38 percent. Loan-to-value (“LTV”) ratios are tiered from 60 percent to 100 percent, depending on the market. Special mortgage programs include fixed and variable fully amortizing loans tailored to the needs of certain healthcare professionals. Variable rate loans are fully indexed at origination and may have fixed rates for three to ten years, then adjust annually thereafter. At March 31, 2017, residential mortgage loans included $204 million of loans guaranteed by U.S. government agencies previously sold into GNMA mortgage pools. These loans either have been repurchased or are eligible to be repurchased by the Company when certain defined delinquency criteria are met. Although payments on these loans generally are past due more than 90 days, interest continues to accrue based on the government guarantee. Home equity loans totaled $764 million at March 31, 2017. Approximately 66 percent of the home equity loan portfolio is comprised of first lien loans and 34 percent of the home equity portfolio is comprised of junior lien loans. Junior lien loans are distributed 51 percent to amortizing term loans and 49 percent to revolving lines of credit. Home equity loans generally require a minimum FICO score of 700 and a maximum DTI of 40 percent. The maximum loan amount available for our home equity loan products is generally $400 thousand. Revolving loans have a 5 year revolving period followed by a 15 year term of amortizing repayments. Interest-only home equity loans may not be extended for any additional revolving time. All other home equity loans may be extended at management's discretion for an additional 5 year revolving term, subject to an update of certain credit information. Credit Commitments Commitments to extend credit are agreements to lend to a customer as long as there is no violation of conditions established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. At March 31, 2017, outstanding commitments totaled $9.4 billion. Because some commitments are expected to expire before being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. BOK Financial uses the same credit policies in making commitments as it does loans. The amount of collateral obtained, if deemed necessary, is based upon management’s credit evaluation of the borrower. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Because the credit risk involved in issuing standby letters of credit is essentially the same as that involved in extending loan commitments, BOK Financial uses the same credit policies in evaluating the creditworthiness of the customer. Additionally, BOK Financial uses the same evaluation process in obtaining collateral on standby letters of credit as it does for loan commitments. The term of these standby letters of credit is defined in each commitment and typically corresponds with the underlying loan commitment. At March 31, 2017, outstanding standby letters of credit totaled $596 million. Commercial letters of credit are used to facilitate customer trade transactions with the drafts being drawn when the underlying transaction is consummated. At March 31, 2017, outstanding commercial letters of credit totaled $3.8 million. Allowances for Credit Losses BOK Financial maintains an allowance for loan losses and an accrual for off-balance sheet credit risk. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees. As discussed in greater detail in Note 6, the Company also has separate accruals for off-balance sheet credit risk related to residential mortgage loans previously sold with full or partial recourse and for residential mortgage loans sold to government sponsored agencies under standard representations and warranties. The appropriateness of the allowance for loan losses and accrual for off-balance sheet credit losses (collectively "allowance for credit losses") is assessed by management based on an on-going quarterly evaluation of the probable estimated losses inherent in the portfolio, including probable losses on both outstanding loans and unused commitments. The allowance for loan losses consists of specific allowances attributed to impaired loans that have not yet been charged down to amounts we expect to recover, general allowances for unimpaired loans based on estimated loss rates by loan class and nonspecific allowances based on general economic conditions, risk concentration and related factors. There have been no material changes in the approach or techniques utilized in developing the allowance for loan losses and the accrual for off-balance sheet credit losses for the three months ended March 31, 2017. Loans are considered to be impaired when it becomes probable that BOK Financial will be unable to collect all amounts due according to the contractual terms of the loan agreements. Internally risk graded loans are evaluated individually for impairment. Substantially all commercial and commercial real estate loans and certain residential mortgage and consumer loans are risk graded based on evaluation of the borrowers' ability to repay. Certain commercial loans and most residential mortgage and consumer loans are small balance, homogeneous pools of loans that are not risk graded. Non-risk graded loans are identified as impaired based on performance status. Generally, non-risk graded loans 90 days or more past due or modified in a TDR or in bankruptcy are considered to be impaired. Specific allowances for impaired loans are measured by an evaluation of estimated future cash flows discounted at the loans’ initial effective interest rate or the fair value of collateral for certain collateral dependent loans. Collateral value of real property is generally based on third party appraisals that conform to Uniform Standards of Professional Appraisal Practice, less estimated selling costs. Appraised values are on an "as-is" basis and are generally not adjusted by the Company. Updated appraisals are obtained at least annually or more frequently if market conditions indicate collateral values have declined. Collateral value of mineral rights is generally determined by our internal staff of engineers based on projected cash flows under current market conditions. Collateral values and available cash resources that support impaired loans are evaluated quarterly. Historical statistics may be used as a practical way to estimate impairment in limited situations, such as when a collateral dependent loan is identified as impaired at the end of a reporting period, until an updated appraisal of collateral value is received or a full assessment of future cash flows is completed. Estimates of future cash flows and collateral values require significant judgments and may be volatile. General allowances for unimpaired loans are based on estimated loss rates by loan class. The gross loss rate for each loan class is determined by the greater of the current gross loss rate based on the most recent twelve months or a ten-year gross loss rate. Recoveries are not directly considered in the estimation of loss rates. Recoveries generally do not follow predictable patterns and are not received until well after the charge-off date as a result of protracted legal actions. For risk graded loans, gross loss rates are adjusted for changes in risk grading. For each loan class, the current weighted average risk grade is compared to the long-term average risk grade. This comparison determines whether credit risk in each loan class is increasing or decreasing. Loss rates are adjusted upward or downward in proportion to changes in average risk grading. General allowances for unimpaired loans also consider inherent risks identified for each loan class. Inherent risks consider loss rates that most appropriately represent the current credit cycle and other factors attributable to specific loan classes which have not yet been represented in the gross loss rates or risk grading. These factors include changes in commodity prices or engineering imprecision, which may affect the value of reserves that secure our energy loan portfolio, construction risk that may affect commercial real estate loans, changes in regulations and public policy that may disproportionately impact health care loans and changes in loan products. Nonspecific allowances are maintained for risks beyond factors specific to a particular loan or loan class. These factors include trends in the economy of our primary lending areas, concentrations in large balance loans and other relevant factors. An accrual for off-balance sheet credit losses is included in Other liabilities in the Consolidated Balance Sheets. The appropriateness of this accrual is determined in the same manner as the allowance for loan losses. A provision for credit losses is charged against or credited to earnings in amounts necessary to maintain an appropriate allowance for credit losses. Recoveries of loans previously charged off are added to the allowance when received. The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended March 31, 2017 is summarized as follows (in thousands):
The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended March 31, 2016 is summarized as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at March 31, 2017 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2016 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at March 31, 2016 is as follows (in thousands):
Credit Quality Indicators The Company utilizes loan class and risk grading as primary credit quality indicators. Substantially all commercial and commercial real estate loans and certain residential mortgage and consumer loans are risk graded based on a quarterly evaluation of the borrowers’ ability to repay the loans. Certain commercial loans and most residential mortgage and consumer loans are small, homogeneous pools that are not risk graded. The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at March 31, 2017 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2016 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at March 31, 2016 is as follows (in thousands):
Loans are considered to be performing if they are in compliance with the original terms of the agreement and currently exhibit no factors that cause management to have doubts about the borrowers' ability to remain in compliance with the original terms of the agreement, which is consistent with the regulatory guideline of “pass.” Performing loans also include past due residential mortgages that are guaranteed by agencies of the U.S. government that continue to accrue interest based on criteria of the guarantors' programs. Other loans especially mentioned are currently performing in compliance with the original terms of the agreement but may have a potential weakness that deserves management’s close attention, consistent with regulatory guidelines. The risk grading process identified certain loans that have a well-defined weakness (e.g. inadequate debt service coverage or liquidity or marginal capitalization; repayment may depend on collateral or other risk mitigation) that may jeopardize liquidation of the debt and represent a greater risk due to deterioration in the financial condition of the borrower. This is consistent with the regulatory guideline for “substandard.” Because the borrowers are still performing in accordance with the original terms of the loan agreements, these loans were not placed in nonaccruing status. Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This is substantially the same criteria used to determine whether a loan is impaired and includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines. The following table summarizes the Company’s loan portfolio at March 31, 2017 by the risk grade categories (in thousands):
The following table summarizes the Company’s loan portfolio at December 31, 2016 by the risk grade categories (in thousands):
The following table summarizes the Company’s loan portfolio at March 31, 2016 by the risk grade categories (in thousands):
Impaired Loans Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreement. This includes all nonaccruing loans, all loans modified in a TDR and all loans repurchased from GNMA pools. A summary of impaired loans follows (in thousands):
Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, are recovered. A summary of impaired loans at December 31, 2016 follows (in thousands):
A summary of impaired loans at March 31, 2016 follows (in thousands):
Troubled Debt Restructurings A summary of troubled debt restructurings ("TDRs") by accruing status as of March 31, 2017 is as follows (in thousands):
A summary of troubled debt restructurings by accruing status as of December 31, 2016 is as follows (in thousands):
A summary of troubled debt restructurings by accruing status as of March 31, 2016 is as follows (in thousands):
Troubled debt restructurings generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. The following tables detail the recorded balance of loans at March 31, 2017 by class that were restructured during the three months ended March 31, 2017 by primary type of concession (in thousands):
Troubled debt restructurings generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. The following tables detail the recorded balance of loans by class that were restructured during three months ended March 31, 2016 by primary type of concession (in thousands):
The following table summarizes, by loan class, the recorded investment at March 31, 2017 and 2016, respectively, of loans modified as TDRs within the previous 12 months and for which there was a payment default during the three months ended March 31, 2017 and 2016, respectively (in thousands):
A payment default is defined as being 30 days or more past due. The table above includes loans that experienced a payment default during the period, but may be performing in accordance with the modified terms as of the balance sheet date. Nonaccrual & Past Due Loans Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans. A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of March 31, 2017 is as follows (in thousands):
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2016 is as follows (in thousands):
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of March 31, 2016 is as follows (in thousands):
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Acquisitions |
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| Business Combinations [Abstract] | |
| Business Combination Disclosure [Text Block] | Acquisitions On December 1, 2016, the Company acquired MBT Bancshares (“MBT”), parent company of Missouri Bank and Trust of Kansas City (“Mobank”) following regulatory approval of the transaction. Mobank operated four banking branches in the Kansas City, Mo. area. BOK Financial paid $102.5 million in an all-cash deal for all outstanding shares of MBT stock. MBT was merged into BOK Financial and Mobank became a wholly owned subsidiary of BOK Financial on December 1, 2016. On February 21, 2017, Mobank was merged with the Bank of Kansas City division of BOKF, NA. All branches in the Kansas City market will operate under the Mobank name. The preliminary purchase price allocation was updated in the first quarter of 2017 resulting in a $2.0 million increase in identifiable intangibles, $1.5 million decrease in premises and equipment and other repossessed assets, and a $526 thousand decrease in goodwill. |
Mortgage Banking Activities |
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| Mortgage Banking [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mortgage Banking Activities [Text Block] | Mortgage Banking Activities Residential Mortgage Loan Production The Company originates, markets and services conventional and government-sponsored residential mortgage loans. Generally, conforming fixed rate residential mortgage loans are held for sale in the secondary market and non-conforming and adjustable-rate residential mortgage loans are retained for investment. Residential mortgage loans originated for sale by the Company are carried at fair value based on sales commitments and market quotes. Changes in the fair value of mortgage loans held for sale are included in Other operating revenue – Mortgage banking revenue. Residential mortgage loans held for sale also includes the fair value of residential mortgage loan commitments and forward sale commitments which are considered derivative contracts that have not been designated as hedging instruments for accounting purposes. The volume of mortgage loans originated for sale and secondary market prices are the primary drivers of originating and marketing revenue. Residential mortgage loan commitments are generally outstanding for 60 to 90 days, which represents the typical period from commitment to originate a residential mortgage loan to when the closed loan is sold to an investor. Residential mortgage loan commitments are subject to both credit and interest rate risk. Credit risk is managed through underwriting policies and procedures, including collateral requirements, which are generally accepted by the secondary loan markets. Exposure to interest rate fluctuations is partially managed through forward sales of residential mortgage-backed securities and forward sales contracts. These latter contracts set the price for loans that will be delivered in the next 60 to 90 days. The unpaid principal balance of residential mortgage loans held for sale, notional amounts of derivative contracts related to residential mortgage loan commitments and forward contract sales and their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands):
No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of March 31, 2017, December 31, 2016 or March 31, 2016. No credit losses were recognized on residential mortgage loans held for sale for the three month periods ended March 31, 2017 and 2016. Mortgage banking revenue was as follows (in thousands):
Production revenue includes gain (loss) on residential mortgage loans held for sale and changes in the fair value of derivative contracts not designated as hedging instruments for accounting purposes related to residential mortgage loan commitments and forward sales contracts. Servicing revenue includes servicing fee income and late charges on loans serviced for others. Residential Mortgage Servicing Mortgage servicing rights may be originated or purchased. Both originated and purchased mortgage servicing rights are initially recognized at fair value. The Company has elected to carry all mortgage servicing rights at fair value. Changes in the fair value are recognized in earnings as they occur. The unpaid principal balance of loans serviced for others is the primary driver of servicing revenue. The following represents a summary of mortgage servicing rights (Dollars in thousands):
Activity in capitalized mortgage servicing rights during the three months ended March 31, 2017 was as follows (in thousands):
Activity in capitalized mortgage servicing rights during the three months ended March 31, 2016 was as follows (in thousands):
Changes in the fair value of mortgage servicing rights are included in Other operating revenue in the Consolidated Statements of Earnings. Changes in fair value due to actual loan payments are included in Mortgage banking costs. Changes in fair value due to market assumption changes are reported separately. Changes in fair value due to market assumption changes during the period relate to assets held at the reporting date. There is no active market for trading in mortgage servicing rights after origination. Fair value is determined by discounting the projected net cash flows. Significant assumptions used to determine fair value based on significant unobservable inputs were as follows:
Changes in primary residential mortgage interest rates directly affect the prepayment speeds used in valuing our mortgage servicing rights. A separate third party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults and other relevant factors. The prepayment model is updated periodically for changes in market conditions and adjusted to better correlate with actual performance of BOK Financial’s servicing portfolio. The interest rate sensitivity of our mortgage servicing rights is modeled over a range of +/- 50 basis points. At March 31, 2017, a 50 basis point decrease in mortgage interest rates is expected to decrease the fair value of our mortgage servicing rights by $30 million. A 50 basis point increase in mortgage interest rates is expected to increase the fair value of our mortgage servicing rights by $25 million. In the model, changes in the value of servicing rights due to changes in interest rates assume stable relationships between residential mortgage rates and prepayment speeds. Changes in market conditions can cause variations from these assumptions. These factors and others may cause changes in the value of our mortgage servicing rights to differ from our expectations. The aging status of our mortgage loans serviced for others by investor at March 31, 2017 follows (in thousands):
The Company has obligations to repurchase or provide indemnification for residential mortgage loans sold to government sponsored entities due to standard representations and warranties made under contractual agreements and to service loans in accordance with investor guidelines. The Company has established accruals for losses related to these obligations that are included in Other liabilities in the Consolidated Balance Sheets and in Mortgage banking costs in the Consolidated Statements of Earnings. The Company repurchased 5 loans from the agencies for $598 thousand during the first quarter of 2017. There were three indemnifications on loans paid during the first quarter of 2017. Losses recognized on repurchases were insignificant. A summary of unresolved deficiency requests from the agencies follows (in thousands, except for number of unresolved deficiency requests):
The activity in the accruals for mortgage losses related to repurchases is summarized as follows (in thousands).
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Commitments and Contingent Liabilities |
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments and Contingent Liabilities [Text Block] | Commitments and Contingent Liabilities Litigation Contingencies As a member of Visa, BOK Financial is obligated for a proportionate share of certain covered litigation losses incurred by Visa under a retrospective responsibility plan. A contingent liability was recognized for the Company’s share of Visa’s covered litigation liabilities. Visa funded an escrow account to cover litigation claims, including covered litigation losses under the retrospective responsibility plan, with proceeds from its initial public offering in 2008 and from available cash. BOK Financial currently owns 252,233 Visa Class B shares which are convertible into 415,755 shares of Visa Class A shares after the final settlement of all covered litigation. Class B shares may be diluted in the future if the escrow fund is not adequate to cover future covered litigation costs. Therefore, no value has been currently assigned to the Class B shares and no value may be assigned until the Class B shares are converted into a known number of Class A shares. On March 3, 2015, BOKF, NA and the Company were named as defendants in a class action alleging (1) that the manner in which the Bank posted charges to its consumer deposit accounts was improper from September 1, 2011 through July 8, 2014, the period after which the Bank and BOK Financial had settled a class action respecting a similar claim, and before it made changes to its posting order and (2) that the manner in which the Bank posted charges to its small business deposit accounts was improper from July 9, 2009 through July 8, 2014. Following mediation of the case in August 2016, the Class Representatives and the Bank reached a settlement of the action for $7.8 million. The Settlement has been approved by the Court in a final order, the Company has funded the settlement, and the settlement is being implemented. On June 24, 2015, the Bank received a complaint alleging that an employee had colluded with a bond issuer and an individual in misusing revenues pledged to municipal bonds for which the Bank served as trustee under the bond indenture. The Company conducted an investigation and concluded that employees in one of its Corporate Trust offices had, with respect to a single group of affiliated bond issuances, violated Company policies and procedures by waiving financial covenants, granting forbearances and accepting without disclosure to the bondholders, debt service payments from sources other than pledged revenues. The relationship manager was terminated. The Company reported the circumstances to, and cooperated with an investigation by, the Securities and Exchange Commission ("SEC"). On December 28, 2015, in an action brought by the SEC, the United States District Court for the District of New Jersey entered a judgment against the principals involved in issuing the bonds, precluding the principals from denying the alleged violations of the federal securities laws and requiring the principals to pay all outstanding principal, accrued interest, and other amounts required under the bond documents (estimated to be approximately $73 million, less the value of the facilities securing repayment of the bonds), subject to oversight by a court appointed monitor. On September 7, 2016, the Bank agreed, and the SEC entered, a consent order finding that the Bank had violated Section 17(a) of the Securities Act of 1933 and Section 10(b) of the Securities Exchange Act and requiring the Bank to disgorge $1,067,721 of fees and pay a civil penalty of $600,000. The Bank has disgorged the fees and paid the penalty. On August 26, 2016, the Bank was sued in the United States District Court for New Jersey by two bondholders in a putative class action on behalf of all holders of the bonds alleging the Bank participated in the fraudulent sale of securities by the principals. On September 14, 2016, the Bank was sued in the District Court of Tulsa County, Oklahoma by 19 bondholders alleging the Bank participated in the fraudulent sale of securities by the principals. Management has been advised by counsel that the Bank has valid defenses to the claims. The Bank expects the Court ordered payment plan will result in the payment of the bonds by the principals. Accordingly, no loss is probable at this time and no provision for loss has been made. If the payment plan does not result in payment of the bonds, a loss could become probable. A reasonable estimate cannot be made at this time though the amount could be material to the Company. On March 14, 2017, the Bank was sued in the United States District Court for the Northern District of Oklahoma by bondholders in a second putative class action. The bondholders in this second action allege two individuals purchased facilities from the principals who are the subject of the SEC New Jersey proceedings by means of the fraudulent sale of $60 million of municipal securities for which the Bank also served as indenture trustee. The bondholders allege the Bank failed to disclose that the seller of the purchased facilities had engaged in the conduct complained of in the New Jersey action. The Bank properly performed all duties as indenture trustee of this second set of municipal securities, timely commenced proceedings against the issuer of the securities when default occurred, is cooperating with the SEC in actions against the two principals, is not a target of the SEC proceedings, and has been advised by counsel that the Bank has valid defenses to the claims of these bondholders. It is the opinion of management that no loss is probable at this time. The Director of the New Mexico Securities Division of the State of New Mexico Regulation and Licensing Department ("the Director") issued a Notice of Contemplated Action in connection with the purchases of various municipal bonds by the elected County Treasurer of Bernalillo County, New Mexico, from BOK Financial Securities, Inc., the Company’s broker-dealer affiliate. The Notice was settled by a $125,000 payment to the Division’s Educational fund, without any fine, penalty or sanction. The County of Bernalillo, New Mexico, has commenced arbitration pursuant to the Arbitration Rules of FINRA seeking recovery of $5.6 million arising out of the purchases. The Company has been advised that any recovery by the County is remote. On March 30, 2017, two deposit customers of the Bank sued the Bank in the District Court of Harris County, Texas. A judgment creditor had served a garnishment summons on the Bank. The deposit customers allege that, because the Bank was unable to produce adequate documentation of ownership of a series of deposit accounts at the Bank owned by them, they were compelled to enter into a settlement agreement with the judgment creditor pursuant to which the Bank paid $4.2 million from the accounts to the judgment creditor. The two deposit customers seek $7 million. The amount of liability, if any, has not been quantified at this time. Although a loss may be probable, the amount of the liability, if any, cannot be quantified at this time. In the ordinary course of business, BOK Financial and its subsidiaries are subject to legal actions and complaints. Management believes, based upon the opinion of counsel, that the actions and liability or loss, if any, resulting from the final outcomes of the proceedings, will not have a material effect on the Company’s financial condition, results of operations or cash flows. Alternative Investment Commitments The Company sponsors two private equity funds and invests in several tax credit entities and other funds as permitted by banking regulations. Consolidation of these investments is based on the variable interest model determined by the nature of the entity. Variable interest entities are generally defined as entities that either do not have sufficient equity to finance their activities without support from other parties or whose equity investors lack a controlling financial interest. Variable interest entities are consolidated based on the determination that the Company is the primary beneficiary including the power to direct the activities that most significantly impact the variable interest's economic performance and the obligation to absorb losses of the variable interest or the right to receive benefits of the variable interest that could be significant to the variable interest. BOKF Equity, LLC, an indirect wholly-owned subsidiary, is the general partner of two consolidated private equity funds (“the Funds”). The Funds provide alternative investment opportunities to certain customers, some of which are related parties, through unaffiliated limited partnerships. These unaffiliated limited partnerships generally invest in distressed assets, asset buy-outs or venture capital companies. As general partner, BOKF Equity, LLC has the power to direct activities that most significantly affect the Funds' performance and contingent obligations to make additional investments totaling $4.0 million at March 31, 2017. Substantially all of the obligations are offset by limited partner commitments. The Company does not accrue its contingent liability to fund investments. The Volcker Rule in Title VI of the Dodd-Frank Act will limit both the amount and structure of these types of investments. Consolidated tax credit investment entities represent the Company's interest in entities earning federal new market tax credits related to qualifying loans. The Company has the power to direct the activities that most significantly impact the variable interest's economic performance of the entity including being the primary beneficiary of or the obligation to absorb losses of the variable interest that could be significant to the variable interest. Other consolidated alternative investments include entities held under merchant banking authority. While the Company owns a majority of the voting interest in these entities, its ability to manage daily operations is limited by applicable banking regulations. Consolidated other assets includes total tangible assets, identifiable intangible assets and goodwill held by these entities. The Company also has interests in various unrelated alternative investments generally consisting of unconsolidated limited partnership interests in or loans to entities for which investment return is primarily in the form of tax credits or that invest in distressed real estate loans and properties, energy development, venture capital and other activities. The Company is prohibited by banking regulations from controlling or actively managing the activities of these investments and the Company's maximum exposure to loss is restricted to its investment balance. The Company's obligation to fund alternative investments is included in Other liabilities in the Consolidated Balance Sheets. A summary of consolidated and unconsolidated alternative investments as of March 31, 2017, December 31, 2016 and March 31, 2016 is as follows (in thousands):
Other Commitments and Contingencies At March 31, 2017, Cavanal Hill Funds’ assets included U.S. Treasury, cash management and tax-free money market funds. Assets of these funds consist of highly-rated, short-term obligations of the U.S. Treasury, corporate issuers and U.S. states and municipalities. The net asset value of units in these funds was $1.00 at March 31, 2017. An investment in these funds is not insured by the Federal Deposit Insurance Corporation or guaranteed by BOK Financial or any of its subsidiaries. BOK Financial may, but is not obligated to purchase assets from these funds to maintain the net asset value at $1.00. No assets were purchased from the funds in 2017 or 2016. |
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Shareholders' Equity |
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| Stockholders' Equity Note [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholders' Equity [Text Block] | Shareholders' Equity On April 25, 2017, the Company declared a quarterly cash dividend of $0.44 per common share on or about May 26, 2017 to shareholders of record as of May 12, 2017. Dividends declared were $0.44 per share during the three months ended March 31, 2017 and $0.43 per share during the three months ended March 31, 2016. Accumulated Other Comprehensive Income (Loss) AOCI includes unrealized gains and losses on available for sale ("AFS") securities and non-credit related unrealized losses on AFS securities for which an other-than-temporary impairment has been recorded in earnings. AOCI also includes unrealized gains on AFS securities that were transferred from AFS to investment securities in the third quarter of 2011. Such amounts are being amortized over the estimated remaining life of the security as an adjustment to yield, offsetting the related amortization of premium on the transferred securities. Unrealized losses on employee benefit plans will be reclassified into income as pension plan costs are recognized over the remaining service period of plan participants. Gains and losses in AOCI are net of deferred income taxes. A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
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Earnings Per Share |
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| Earnings Per Share [Text Block] | Earnings Per Share
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Reportable Segments |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Segment Reporting [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reportable Segments [Text Block] | Reportable Segments Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2017 is as follows (in thousands):
Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2016 is as follows (in thousands):
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Fair Value Measurements |
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Measurements [Text Block] | Fair Value Measurements Fair value is defined by applicable accounting guidance as the price to sell an asset or transfer a liability in an orderly transaction between market participants in the principal market for the given asset or liability at the measurement date based on market conditions at that date. Certain assets and liabilities are recorded in the Company’s financial statements at fair value. Some are recorded on a recurring basis and some on a non-recurring basis. For some assets and liabilities, observable market transactions and market information might be available. For other assets and liabilities, observable market transactions and market information might not be available. A hierarchy for fair value has been established which categorizes into three levels the inputs to valuation techniques used to measure fair value. The three levels are as follows: Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) - Fair value is based on unadjusted quoted prices in active markets for identical assets or liabilities. Significant Other Observable Inputs (Level 2) - Fair value is based on significant other observable inputs which are generally determined based on a single price for each financial instrument provided to us by an applicable third-party pricing service and is based on one or more of the following:
Significant Unobservable Inputs (Level 3) - Fair value is based upon model-based valuation techniques for which at least one significant assumption is not observable in the market. Transfers between levels are recognized as of the end of the reporting period. There were no transfers in or out of quoted prices in active markets for identical instruments to significant other observable inputs or significant unobservable inputs during the three months ended March 31, 2017 and 2016, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the three months ended March 31, 2017 and 2016 are included in the summary of changes in recurring fair values measured using unobservable inputs. The underlying methods used by the third-party pricing services are considered in determining the primary inputs used to determine fair values. Management has evaluated the methodologies employed by the third-party pricing services by comparing the price provided by the pricing service with other sources, including brokers' quotes, sales or purchases of similar instruments and discounted cash flows to establish a basis for reliance on the pricing service values. Significant differences between the pricing service provided value and other sources are discussed with the pricing service to understand the basis for their values. Based on all observable inputs, management may adjust prices obtained from third-party pricing services to more appropriately reflect the prices that would be received to sell assets or paid to transfer liabilities in orderly transactions in the current market. No significant adjustments were made to prices provided by third-party pricing services at March 31, 2017, December 31, 2016 or March 31, 2016. Assets and Liabilities Measured at Fair Value on a Recurring Basis The fair value of financial assets and liabilities measured on a recurring basis was as follows as of March 31, 2017 (in thousands):
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2016 (in thousands):
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of March 31, 2016 (in thousands):
Following is a description of the Company's valuation methodologies used for assets and liabilities measured on a recurring basis: Securities The fair values of trading, available for sale and fair value option securities are based on quoted prices for identical instruments in active markets, when available. If quoted prices for identical instruments are not available, fair values are based on significant other observable inputs such as quoted prices of comparable instruments or interest rates and credit spreads, yield curves, volatilities, prepayment speeds and loss severities. The fair value of certain available for sale municipal and other debt securities may be based on significant unobservable inputs. These significant unobservable inputs include limited observed trades, projected cash flows, current credit rating of the issuers and, when applicable, the insurers of the debt and observed trades of similar debt. Discount rates are primarily based on references to interest rate spreads on comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies adjusted for a lack of trading volume. Significant unobservable inputs are developed by investment securities professionals involved in the active trading of similar securities. A summary of significant inputs used to value these securities follows. A management committee composed of senior members from the Company's Capital Markets, Risk Management and Finance departments assesses the appropriateness of these inputs quarterly. Derivatives All derivative instruments are carried on the balance sheet at fair value. Fair values for exchange-traded contracts are based on quoted prices. Fair values for over-the-counter interest rate, commodity and foreign exchange contracts are based on valuations provided either by third-party dealers in the contracts, quotes provided by independent pricing services, or a third-party provided pricing model that uses significant other observable market inputs. Credit risk is considered in determining the fair value of derivative instruments. Management determines fair value adjustments based on various risk factors including but not limited to counterparty credit rating or equivalent loan grading, derivative contract notional size, price volatility of the underlying commodity, duration of the derivative contracts and expected loss severity. Expected loss severity is based on historical losses for similarly risk graded commercial loan customers. Decreases in counterparty credit rating or grading and increases in price volatility and expected loss severity all tend to increase the credit quality adjustment which reduces the fair value of asset contracts. The reduction in fair value is recognized in earnings during the current period. We also consider our own credit risk in determining the fair value of derivative contracts. Changes in our credit rating would affect the fair value of our derivative liabilities. In the event of a credit downgrade, the fair value of our derivative liabilities would increase. The change in the fair value would be recognized in earnings in the current period. Residential Mortgage Loans Held for Sale Residential mortgage loans held for sale are carried on the balance sheet at fair value. The fair values of residential mortgage loans held for sale are based upon quoted market prices of such loans sold in securitization transactions, including related unfunded loan commitments and forward sales contracts. The fair value of mortgage loans that were unable to be sold to U.S. government agencies were determined using quoted prices of loans that are sold in securitization transactions with a liquidity discount applied. Other Assets - Private Equity Funds The fair value of the portfolio investments of the Company's two private equity funds is based upon net asset value reported by the underlying funds, as adjusted by the general partner when necessary, as a practical expedient to measure the fair value of the investments in the underlying funds. The Company's private equity funds provide customers alternative investment opportunities as limited partners of the funds. As fund of funds, the private equity funds invest in other limited partnerships or limited liability companies that invest substantially all of their assets in U.S. companies pursuing diversified investment strategies including early-stage venture capital, distressed securities and corporate or asset buy-outs. Private equity fund assets are long-term, illiquid investments. No secondary market exists for these assets. The private equity funds typically invest in funds that provide no redemption rights to investors. The fair value of the private equity investments may only be realized through cash distributions from the underlying funds. See Note 7 for disclosure of the fair value of the private equity funds using the net asset value per share of the underlying investments, as a practical expedient, included in Other assets in the Consolidated Balance Sheets of the Company. The following represents the changes for the three months ended March 31, 2017 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
1 Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards. The following represents the changes for the three months ended March 31, 2016 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
1 Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards. A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of March 31, 2017 follows (in thousands):
A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2016 follows (in thousands):
A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2016 follows (in thousands):
Fair Value of Assets and Liabilities Measured on a Non-Recurring Basis Assets measured at fair value on a non-recurring basis include collateral for certain impaired loans and real property and other assets acquired to satisfy loans, which are based primarily on comparisons to completed sales of similar assets. The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at March 31, 2017 for which the fair value was adjusted during the three months ended March 31, 2017:
The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at March 31, 2016 for which the fair value was adjusted during the three months ended March 31, 2016:
The fair value of collateral-dependent impaired loans secured by real estate and real estate and other repossessed assets and the related fair value adjustments are generally based on unadjusted third-party appraisals. Our appraisal review policies require appraised values to be supported by observed inputs derived principally from or corroborated by observable market data. Appraisals that are not based on observable inputs or that require significant adjustments or fair value measurements that are not based on third-party appraisals are considered to be based on significant unobservable inputs. Non-recurring fair value measurements of collateral-dependent impaired loans and real estate and other repossessed assets based on significant unobservable inputs are generally due to estimates of current fair values between appraisal dates. Significant unobservable inputs include listing prices for the same or comparable assets, uncorroborated expert opinions or management's knowledge of the collateral or industry. Non-recurring fair value measurements of collateral dependent loans secured by mineral rights are generally determined by our internal staff of engineers on projected cash flows under current market conditions and are based on significant unobservable inputs. Projected cash flows are discounted according to risk characteristics of the underlying oil and gas properties. Assets are evaluated to demonstrate with reasonable certainty that crude oil, natural gas and natural gas liquids can be recovered from known oil and gas reservoirs under existing economic and operating conditions at current prices with existing conventional equipment, operating methods and costs. Significant unobservable inputs are developed by asset management and workout professionals and approved by senior Credit Administration executives. A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2017 follows (in thousands):
A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2016 follows (in thousands):
Fair Value of Financial Instruments The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of March 31, 2017 (dollars in thousands):
The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of December 31, 2016 (dollars in thousands):
The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of March 31, 2016 (dollars in thousands):
Because no market exists for certain of these financial instruments and management does not intend to sell these financial instruments, the fair values shown in the tables above may not represent values at which the respective financial instruments could be sold individually or in the aggregate at the given reporting date. The following methods and assumptions were used in estimating the fair value of these financial instruments: Cash and Cash Equivalents The book value reported in the consolidated balance sheets for cash and short-term instruments approximates those assets’ fair values. Securities The fair values of securities are generally based on Significant Other Observable Inputs such as quoted prices for comparable instruments or interest rates and credit spreads, yield curves, volatilities, prepayment speeds and loss severities. Loans The fair value of loans, excluding loans held for sale, are based on discounted cash flow analyses using interest rates and credit and liquidity spreads currently being offered for loans with similar remaining terms to maturity and risk, adjusted for the impact of interest rate floors and ceilings which are classified as Significant Unobservable Inputs. The fair values of loans were estimated to approximate their discounted cash flows less loan loss allowances allocated to these loans of $221 million at March 31, 2017, $218 million at December 31, 2016 and $208 million at March 31, 2016. A summary of assumptions used in determining the fair value of loans follows:
Deposits The fair values of time deposits are based on discounted cash flow analyses using interest rates currently being offered on similar transactions which are considered Significant Unobservable Inputs. Estimated fair value of deposits with no stated maturity, which includes demand deposits, transaction deposits, money market deposits and savings accounts, is equal to the amount payable on demand. Although market premiums paid reflect an additional value for these low cost deposits, adjusting fair value for the expected benefit of these deposits is prohibited. Accordingly, the positive effect of such deposits is not included in the tables above. A summary of assumptions used in determining the fair value of time deposits follows:
Other Borrowings and Subordinated Debentures The fair values of these instruments are based upon discounted cash flow analyses using interest rates currently being offered on similar instruments which are considered Significant Unobservable Inputs. A summary of assumptions used in determining the fair value of other borrowing and subordinated debentures follows:
Off-Balance Sheet Instruments The fair values of commercial loan commitments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements. The fair values of these off-balance sheet instruments were not significant at March 31, 2017, December 31, 2016 or March 31, 2016. Fair Value Election As more fully disclosed in Note 2 and Note 6 to the Consolidated Financial Statements, the Company has elected to carry all residential mortgage-backed securities guaranteed by U.S. government agencies and U.S. Treasury securities held as economic hedges against changes in the fair value of mortgage servicing rights and all residential mortgage loans originated for sale at fair value. Changes in the fair value of these financial instruments are recognized in earnings. |
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Federal and State Income Taxes Federal and State Income Taxes |
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| Income Tax Disclosure [Text Block] | Federal and State Income Taxes The reconciliations of income (loss) attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands):
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Subsequent Events |
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| Subsequent Events [Abstract] | |
| Subsequent Events | Subsequent Events The Company evaluated events from the date of the consolidated financial statements on March 31, 2017 through the issuance of those consolidated financial statements included in this Quarterly Report on Form 10-Q. No events were identified requiring recognition in and/or disclosure in the consolidated financial statements. |
Significant Accounting Policies (Policies) |
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Mar. 31, 2017 | |
| Accounting Policies [Abstract] | |
| Basis of Accounting, Policy [Policy Text Block] | The accompanying unaudited consolidated financial statements of BOK Financial Corporation (“BOK Financial” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. |
| Principles of Consolidation [Policy Text Block] | The unaudited consolidated financial statements include accounts of BOK Financial and its subsidiaries, principally BOKF, NA (“the Bank”), BOK Financial Securities, Inc., The Milestone Group, Inc. and Cavanal Hill Investment Management Inc. Operating divisions of the Bank include Bank of Albuquerque, Bank of Arizona, Bank of Arkansas, Bank of Oklahoma, Bank of Texas, Colorado State Bank and Trust, Mobank, BOK Financial Mortgage and the TransFund electronic funds network. |
| Reclassification, Policy [Policy Text Block] | Certain reclassifications have been made to conform to the current period presentation. |
| Newly Adopted and Pending Accounting Policies [Policy Text Block] | Newly Adopted and Pending Accounting Policies Financial Accounting Standards Board (“FASB”) FASB Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09") On May 28, 2014, the FASB issued ASU 2014-09 to clarify the principles for recognizing revenue by providing a more robust framework that will give greater consistency and comparability in revenue recognition practices. In the new framework, an entity recognizes revenue in an amount that reflects the consideration to which the entity expects to be entitled in exchange for goods or services. The new model requires the identification of performance obligations included in contracts with customers, a determination of the transaction price and an allocation of the price to those performance obligations. The entity recognizes revenue when performance obligations are satisfied. ASU 2014-09 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Net interest revenue from financial assets and liabilities is explicitly excluded from the scope of ASU 2014-09. Management expects that most fees and commissions revenue will not be affected. The Company continues to evaluate the impact of ASU 2014-09 on Fiduciary and Asset Management Revenue and Transaction Card Revenue, which represents 18% of gross revenue and 39% of fees and commissions revenue for 2016. Timing of revenue recognition and gross versus net presentation may be affected. Management expects to adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings if such adjustment is significant. FASB Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08") On March 17, 2016, the FASB Issued ASU 2016-08 to amend the principal versus agent implementation guidance in ASU 2014-09. The ASU clarifies that an entity should evaluate whether it is the principal or the agent for each specified good or service promised in a contract with a customer. ASU 2016-08 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is evaluating the impact the adoption of ASU 2016-08 will have on the Company's financial statements along with ASU 2014-09. FASB Accounting Standards Update No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10") On April 14, 2016, the FASB issued ASU 2016-10 which amends certain sections of ASU 2014-09 related to identifying performance obligations and licensing implementation. ASU 2016-10 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is evaluating the impact the adoption of ASU 2016-10 will have on the Company's financial statements along with ASU 2014-09. FASB Accounting Standards Update No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ("ASU 2016-12") On May 9, 2016, the FASB issued ASU 2016-12, which amends certain aspects of the Board's new revenue standard, ASU 2014-09. The amendments clarify information regarding collectability, presentation of sales tax and other similar taxes collected from customers, non-cash consideration, contract modifications and completed contracts at transition, and transition disclosures. ASU 2016-12 is effective for the Company for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is evaluating the impact the adoption of ASU 2016-12 will have on the Company's financial statements along with ASU 2014-09. FASB Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01") On January 5, 2016, the FASB issued ASU 2016-01 over the recognition and measurement of financial assets and liabilities. The update requires equity investments, in general, to be measured at fair value with changes in fair value recognized in earnings. It also eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, requires entities to use the exit price notion when measuring fair value, requires an entity to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from a change in the instrument-specific credit risk when the fair value option has been elected, requires separate presentation of financial assets and liabilities by measurement category and form on the balance sheet or accompanying notes, clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets, and simplifies the impairment assessment of equity investments without readily determinable fair values. The ASU is effective for the Company for interim and annual periods beginning after December 15, 2017. Upon adoption, unrealized gains and losses from equity securities will be reclassified from other comprehensive income to retained earnings. At March 31, 2017, the Company had $3.1 million of unrealized gains included in accumulated other comprehensive income. FASB Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02") On February 25, 2016, the FASB issued ASU 2016-02 to increase transparency and comparability by recognizing lease assets and liabilities on the balance sheet and disclosing key information about leasing arrangements. Lessees will be required to recognize an obligation for future lease payments measured on a discounted basis and a right-of-use asset. The ASU is effective for the Company for interim and annual periods beginning after December 15, 2018 and requires transition through a modified retrospective approach for leases existing at or entered into after January 1, 2017. The Company is evaluating the impact the adoption of ASU 2016-02 will have on the Company's financial statements. FASB Accounting Standards Update No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09") On March 30, 2016, the FASB issued ASU 2016-09 to simplify multiple aspects of accounting for employee share-based payment transactions including accounting income taxes, forfeitures, and statutory tax withholding requirements. The ASU became effective for annual reporting periods beginning after December 15, 2016, including interim periods within those annual reporting periods. Implementation of ASU 2016-09 decreased tax expense $3.9 million in the first quarter of 2017. FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Assets Measured at Amortized Cost ("ASU 2016-13") On June 16, 2016, the FASB issued ASU 2016-13 in order to provide more timely recording of credit losses on loans and other financial instruments. The ASU adds an impairment model (known as the current expected credit loss ("CECL") model) that is based on expected credit losses rather than incurred credit losses. It requires measurement of all expected credit losses for financial assets carried at amortized cost, including loans and investment securities, based on historical experience, current conditions, and reasonable and supportable forecasts. ASU 2016-13 also changes the recognition of other-than-temporary impairment of available for sale securities to an allowance methodology from a direct write-down methodology. ASU 2016-13 will be effective for the Company for annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for annual reporting periods beginning after December 15, 2018. ASU 2016-13 will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company is evaluating the impact the adoption of ASU 2016-13 will have on the Company's financial statements. FASB Accounting Standards Update No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") On August 26, 2016, the FASB issued ASU 2016-15, which amends guidance in ASC 230 on the classification of certain cash receipts and payments in the statement of cash flows. The amendments address eight cash flow issues. ASU 2016-15 is effective for the Company for interim and annual reporting periods beginning after December 15, 2017. Entities generally must apply the guidance retrospectively to all periods presented. Adoption of ASU 2016-15 did not have a material impact on the Company's financial statements. |
| Derivatives, Policy [Policy Text Block] | Derivative instruments may be used by the Company as part of its internal risk management programs or may be offered to customers. All derivative instruments are carried at fair value and changes in fair value are reported in earnings as they occur. Credit risk is also considered in determining fair value. When bilateral netting agreements or similar arrangements exist between the Company and its counterparties that create a single legal claim or obligation to pay or receive the net amount in settlement of the individual derivative contracts, the Company reports derivative assets and liabilities on a net by derivative contract type by counterparty basis. Derivative contracts may require the Company to provide or receive cash margin as collateral for derivative assets and liabilities. Derivative assets and liabilities are reported net of cash margin when certain conditions are met. In addition, derivative contracts executed with customers under Customer Risk Management Programs may be secured by non-cash collateral in conjunction with a credit agreement with that customer. Access to collateral, in the event of default is reasonably assured. As of March 31, 2017, a decrease in BOK Financial's credit rating to below investment grade would increase our obligation to post cash margin on existing contracts by approximately $10 million. None of these derivative contracts have been designated as hedging instruments for accounting purposes. Customer Risk Management Programs BOK Financial offers programs to permit its customers to manage various risks, including fluctuations in energy, cattle and other agricultural products, interest rates and foreign exchange rates with derivative contracts. Customers may also manage interest rate risk through interest rate swaps used by borrowers to modify interest rate terms of their loans or to-be-announced securities used by mortgage banking customers to hedge their loan production. Derivative contracts are executed between the customers and BOK Financial. Offsetting contracts are executed between BOK Financial and other selected counterparties to minimize the risk of changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to BOK Financial as profit and compensation for administrative costs and credit risk which is recognized over the life of the contracts and included in other operating revenue – brokerage and trading revenue in the Consolidated Statements of Earnings. Internal Risk Management Programs BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change in the fair value of mortgage servicing rights and as an economic hedge of trading securities. As of March 31, 2017, derivative contracts under the internal risk management programs were primarily used as part of the economic hedges of the change in the fair value of the mortgage servicing rights and trading securities. As discussed in Note 6, certain derivative contracts not designated as hedging instruments related to mortgage loan commitments and forward sales contracts are included in Residential mortgage loans held for sale on the Consolidated Balance Sheets. See Note 6 for additional discussion of notional, fair value and impact on earnings of these contracts. |
| Loans and Allowances for Credit Losses, Loans [Policy Text Block] | Loans Loans are either secured or unsecured based on the type of loan and the financial condition of the borrower. Repayment is generally expected from cash flow or proceeds from the sale of selected assets of the borrower. BOK Financial is exposed to risk of loss on loans due to the borrower’s difficulties, which may arise from any number of factors, including problems within the respective industry or local economic conditions. Access to collateral, in the event of borrower default, is reasonably assured through adherence to applicable lending laws and through sound lending standards and credit review procedures. Accounting policies for all loans, excluding residential mortgage loans guaranteed by U.S. government agencies, are as follows. Interest is accrued at the applicable interest rate on the principal amount outstanding. Loans are placed on nonaccruing status when, in the opinion of management, full collection of principal or interest is uncertain. Internally risk graded loans are individually evaluated for nonaccruing status quarterly. Non-risk graded loans are generally placed on nonaccruing status when more than 90 days past due or within 60 days of being notified of the borrower's bankruptcy filing. Interest previously accrued but not collected is charged against interest income when the loan is placed on nonaccruing status. Payments on nonaccruing loans are applied to principal or recognized as interest income, according to management’s judgment as to the collectability of principal. Loans may be returned to accruing status when, in the opinion of management, full collection of principal and interest, including principal previously charged off, is probable based on improvements in the borrower’s financial condition or a sustained period of performance. Loans to borrowers experiencing financial difficulties may be modified in troubled debt restructurings ("TDRs"). All TDRs are classified as nonaccruing, excluding loans guaranteed by U.S. government agencies. Modifications generally consist of extension of payment terms or interest rate concessions and may result either voluntarily through negotiations with the borrower or involuntarily through court order. Generally, principal and accrued but unpaid interest is not voluntarily forgiven. Performing loans may be renewed under the current collateral value, debt service ratio and other underwriting standards. Nonaccruing loans may be renewed and will remain classified as nonaccruing. All loans are charged off when the loan balance or a portion of the loan balance is no longer supported by the paying capacity of the borrower or when the required cash flow is reduced in a TDR. The charge-off amount is determined through a quarterly evaluation of available cash resources and collateral value and charge-offs are taken in the quarter in which the loss is identified. Non-risk graded loans that are past due between 60 days and 180 days, based on the loan product type, are charged off. Loans to borrowers whose personal obligation has been discharged through Chapter 7 bankruptcy proceedings are charged off within 60 days of notice of the bankruptcy filing, regardless of payment status. Loan origination and commitment fees and direct loan acquisition and origination costs are deferred and amortized as an adjustment to yield over the life of the loan or over the commitment period, as applicable. Qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. Under certain performance conditions specified in government programs, the Company may have the right, but not the obligation to repurchase loans from GNMA pools. These loans no longer qualify for sale accounting and are recognized in the Consolidated Balance Sheets. Guaranteed loans are considered impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. The principal balance continues to be guaranteed; however, interest accrues at a curtailed rate as specified in the programs. The carrying value of these loans is reduced based on an estimate of the expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in TDRs in accordance with U.S. government agency guidelines. Interest continues to accrue based on the modified rate. Guaranteed loans may either be resold into GNMA pools after a performance period specified by the programs or foreclosed and conveyed to the guarantors. Loans are disaggregated into portfolio segments and further disaggregated into classes. The portfolio segment is the level at which the Company develops and documents a systematic method for determining its allowance for credit losses. Classes are a further disaggregation of portfolio segments based on the risk characteristics of the loans and the Company’s method for monitoring and assessing credit risk. |
| Loans and Allowances for Credit Losses, Allowances for Credit Losses [Policy Text Block] | Allowances for Credit Losses BOK Financial maintains an allowance for loan losses and an accrual for off-balance sheet credit risk. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees. As discussed in greater detail in Note 6, the Company also has separate accruals for off-balance sheet credit risk related to residential mortgage loans previously sold with full or partial recourse and for residential mortgage loans sold to government sponsored agencies under standard representations and warranties. The appropriateness of the allowance for loan losses and accrual for off-balance sheet credit losses (collectively "allowance for credit losses") is assessed by management based on an on-going quarterly evaluation of the probable estimated losses inherent in the portfolio, including probable losses on both outstanding loans and unused commitments. The allowance for loan losses consists of specific allowances attributed to impaired loans that have not yet been charged down to amounts we expect to recover, general allowances for unimpaired loans based on estimated loss rates by loan class and nonspecific allowances based on general economic conditions, risk concentration and related factors. There have been no material changes in the approach or techniques utilized in developing the allowance for loan losses and the accrual for off-balance sheet credit losses for the three months ended March 31, 2017. Loans are considered to be impaired when it becomes probable that BOK Financial will be unable to collect all amounts due according to the contractual terms of the loan agreements. Internally risk graded loans are evaluated individually for impairment. Substantially all commercial and commercial real estate loans and certain residential mortgage and consumer loans are risk graded based on evaluation of the borrowers' ability to repay. Certain commercial loans and most residential mortgage and consumer loans are small balance, homogeneous pools of loans that are not risk graded. Non-risk graded loans are identified as impaired based on performance status. Generally, non-risk graded loans 90 days or more past due or modified in a TDR or in bankruptcy are considered to be impaired. Specific allowances for impaired loans are measured by an evaluation of estimated future cash flows discounted at the loans’ initial effective interest rate or the fair value of collateral for certain collateral dependent loans. Collateral value of real property is generally based on third party appraisals that conform to Uniform Standards of Professional Appraisal Practice, less estimated selling costs. Appraised values are on an "as-is" basis and are generally not adjusted by the Company. Updated appraisals are obtained at least annually or more frequently if market conditions indicate collateral values have declined. Collateral value of mineral rights is generally determined by our internal staff of engineers based on projected cash flows under current market conditions. Collateral values and available cash resources that support impaired loans are evaluated quarterly. Historical statistics may be used as a practical way to estimate impairment in limited situations, such as when a collateral dependent loan is identified as impaired at the end of a reporting period, until an updated appraisal of collateral value is received or a full assessment of future cash flows is completed. Estimates of future cash flows and collateral values require significant judgments and may be volatile. General allowances for unimpaired loans are based on estimated loss rates by loan class. The gross loss rate for each loan class is determined by the greater of the current gross loss rate based on the most recent twelve months or a ten-year gross loss rate. Recoveries are not directly considered in the estimation of loss rates. Recoveries generally do not follow predictable patterns and are not received until well after the charge-off date as a result of protracted legal actions. For risk graded loans, gross loss rates are adjusted for changes in risk grading. For each loan class, the current weighted average risk grade is compared to the long-term average risk grade. This comparison determines whether credit risk in each loan class is increasing or decreasing. Loss rates are adjusted upward or downward in proportion to changes in average risk grading. General allowances for unimpaired loans also consider inherent risks identified for each loan class. Inherent risks consider loss rates that most appropriately represent the current credit cycle and other factors attributable to specific loan classes which have not yet been represented in the gross loss rates or risk grading. These factors include changes in commodity prices or engineering imprecision, which may affect the value of reserves that secure our energy loan portfolio, construction risk that may affect commercial real estate loans, changes in regulations and public policy that may disproportionately impact health care loans and changes in loan products. Nonspecific allowances are maintained for risks beyond factors specific to a particular loan or loan class. These factors include trends in the economy of our primary lending areas, concentrations in large balance loans and other relevant factors. An accrual for off-balance sheet credit losses is included in Other liabilities in the Consolidated Balance Sheets. The appropriateness of this accrual is determined in the same manner as the allowance for loan losses. A provision for credit losses is charged against or credited to earnings in amounts necessary to maintain an appropriate allowance for credit losses. Recoveries of loans previously charged off are added to the allowance when received. |
Securities (Tables) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Marketable Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Securities [Table Text Block] | The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands):
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| Investment Securities (Held-to-Maturity) [Table Text Block] | The amortized cost and fair values of investment securities are as follows (in thousands):
The amortized cost and fair values of investment securities at March 31, 2017, by contractual maturity, are as shown in the following table (dollars in thousands):
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| Available For Sale Securities [Table Text Block] | The amortized cost and fair value of available for sale securities are as follows (in thousands):
1 Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet. 2 Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.
1 Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet. 2 Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.
The amortized cost and fair values of available for sale securities at March 31, 2017, by contractual maturity, are as shown in the following table (dollars in thousands):
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
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| Securities Pledged As Collateral [Table Text Block] | A summary of investment and available for sale securities that have been pledged as collateral for repurchase agreements, public trust funds on deposit and for other purposes, as required by law was as follows (in thousands):
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| Schedule of Unrealized Loss on Investments [Table Text Block] | Temporarily Impaired Securities as of March 31, 2017 (in thousands):
Temporarily Impaired Securities as of December 31, 2016 (In thousands)
Temporarily Impaired Securities as of March 31, 2016 (In thousands)
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| Other-than-temporary impairement, Private Lable Mortgage-Backed Securities, Assumptions Used to Develop Projected Cash Flows [Table Text Block] | The primary assumptions used in this evaluation were:
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| Rollforward Other-than-temporary Impairment Credit Losses Recognized in Earnings [Table Text Block] | The following is a tabular roll forward of the amount of credit-related OTTI recognized on available for sale debt securities in earnings (in thousands):
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| Fair Value Option Securities [Table Text Block] | The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands):
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| Schedule of Restricted Equity Securities [Table Text Block] |
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Derivatives (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative Instrument Detail [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative Contracts [Table Text Block] | The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at March 31, 2017 (in thousands):
The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2016 (in thousands):
The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at March 31, 2016 (in thousands):
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| Derivative Instruments, Gain (Loss) in Statement of Earnings [Table Text Block] | The following summarizes the pre-tax net gains (losses) on derivative instruments and where they are recorded in the income statement (in thousands):
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Loans and Allowances for Credit Losses (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans Receivable, Net [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Loans by Portfolio Segment [Table Text Block] | Portfolio segments of the loan portfolio are as follows (in thousands):
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| Rollforward of Allowance For Loan Losses And Accrual for Off-Balance Sheet Credit Losses [Table Text Block] | The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended March 31, 2017 is summarized as follows (in thousands):
The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended March 31, 2016 is summarized as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at March 31, 2017 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2016 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at March 31, 2016 is as follows (in thousands):
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| Schedule of Allowance for Loan Losses and Recorded Investment by Portfolio Segment for Risk Graded and Non-Risk Graded Loans [Table Text Block] | The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at March 31, 2017 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2016 is as follows (in thousands):
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at March 31, 2016 is as follows (in thousands):
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| Schedule of Credit Quality Indicators [Table Text Block] | The following table summarizes the Company’s loan portfolio at March 31, 2017 by the risk grade categories (in thousands):
The following table summarizes the Company’s loan portfolio at December 31, 2016 by the risk grade categories (in thousands):
The following table summarizes the Company’s loan portfolio at March 31, 2016 by the risk grade categories (in thousands):
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| Summary of Impaired Loans [Table Text Block] | Impaired Loans Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreement. This includes all nonaccruing loans, all loans modified in a TDR and all loans repurchased from GNMA pools. A summary of impaired loans follows (in thousands):
Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, are recovered. A summary of impaired loans at December 31, 2016 follows (in thousands):
A summary of impaired loans at March 31, 2016 follows (in thousands):
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| Troubled Debt Restructurings [Table Text Block] | Troubled Debt Restructurings A summary of troubled debt restructurings ("TDRs") by accruing status as of March 31, 2017 is as follows (in thousands):
A summary of troubled debt restructurings by accruing status as of December 31, 2016 is as follows (in thousands):
A summary of troubled debt restructurings by accruing status as of March 31, 2016 is as follows (in thousands):
Troubled debt restructurings generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. The following tables detail the recorded balance of loans at March 31, 2017 by class that were restructured during the three months ended March 31, 2017 by primary type of concession (in thousands):
Troubled debt restructurings generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. The following tables detail the recorded balance of loans by class that were restructured during three months ended March 31, 2016 by primary type of concession (in thousands):
The following table summarizes, by loan class, the recorded investment at March 31, 2017 and 2016, respectively, of loans modified as TDRs within the previous 12 months and for which there was a payment default during the three months ended March 31, 2017 and 2016, respectively (in thousands):
A payment default is defined as being 30 days or more past due. The table above includes loans that experienced a payment default during the period, but may be performing in accordance with the modified terms as of the balance sheet date. |
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| Summary of Loans by Aging Status [Table Text Block] | Nonaccrual & Past Due Loans Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans. A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of March 31, 2017 is as follows (in thousands):
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2016 is as follows (in thousands):
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of March 31, 2016 is as follows (in thousands):
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Mortgage Banking Activities (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Mortgage Banking [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Components of Residential Mortgage Loans Held For Sale [Table Text Block] |
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| Mortgage Banking Revenue [Table Text Block] | Mortgage banking revenue was as follows (in thousands):
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| Summary of Mortgage Servicing Rights [Table Text Block] | The following represents a summary of mortgage servicing rights (Dollars in thousands):
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| Activity in Capitalized Mortgage Servicing Rights [Table Text Block] | Activity in capitalized mortgage servicing rights during the three months ended March 31, 2017 was as follows (in thousands):
Activity in capitalized mortgage servicing rights during the three months ended March 31, 2016 was as follows (in thousands):
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| Assumptions to Value Mortgage Servicing Rights [Table Text Block] | There is no active market for trading in mortgage servicing rights after origination. Fair value is determined by discounting the projected net cash flows. Significant assumptions used to determine fair value based on significant unobservable inputs were as follows:
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| Aging Status of Mortgage Loans Serviced For Others [Table Text Block] | The aging status of our mortgage loans serviced for others by investor at March 31, 2017 follows (in thousands):
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| Summary of Unresolved Deficiency Requests and Related Accrual for Credit Losses [Table Text Block] | A summary of unresolved deficiency requests from the agencies follows (in thousands, except for number of unresolved deficiency requests):
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| Activity in Accruals for Mortgage Losses [Table Text Block] | The activity in the accruals for mortgage losses related to repurchases is summarized as follows (in thousands).
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Commitments and Contingent Liabilities Commitments and Contingent Liabilities - Variable Interest Entities (Tables) |
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Variable Interest Entities [Table Text Block] | A summary of consolidated and unconsolidated alternative investments as of March 31, 2017, December 31, 2016 and March 31, 2016 is as follows (in thousands):
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Shareholders' Equity (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Stockholders' Equity Note [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
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Earnings Per Share (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share [Table Text Block] |
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Reportable Segments (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reportable Segments [Table Text Block] | Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2017 is as follows (in thousands):
Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2016 is as follows (in thousands):
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Fair Value Measurements (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assets And Liabilities Measured On A Recurring Basis [Table Text Block] | The fair value of financial assets and liabilities measured on a recurring basis was as follows as of March 31, 2017 (in thousands):
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2016 (in thousands):
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of March 31, 2016 (in thousands):
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| Fair Value Assets Measured On Recurring Basis, Significant Unobservable Inputs [Table Text Block] | The following represents the changes for the three months ended March 31, 2017 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
1 Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards. The following represents the changes for the three months ended March 31, 2016 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
1 Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards. |
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| Fair Value Inputs, Fair Value Measured On a Recurring Basis, Quantitative Information [Table Text Block] | A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of March 31, 2017 follows (in thousands):
A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2016 follows (in thousands):
A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2016 follows (in thousands):
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| Fair Value Assets Measured on Nonrecurring Basis [Table Text Block] | The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at March 31, 2017 for which the fair value was adjusted during the three months ended March 31, 2017:
The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at March 31, 2016 for which the fair value was adjusted during the three months ended March 31, 2016:
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| Fair Value Inputs, Fair Value Measured On a Nonrecurring Basis, Quantitative Information [Table Text Block] | A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2017 follows (in thousands):
A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2016 follows (in thousands):
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| Fair Value of Financial Instruments [Table Text Block] | The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of March 31, 2017 (dollars in thousands):
The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of December 31, 2016 (dollars in thousands):
The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of March 31, 2016 (dollars in thousands):
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| Fair Value Inputs, Financial Instruments, Quantitative Information [Table Text Block] |
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Federal and State Income Taxes Federal and State Income Taes (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliations of income (loss) attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands):
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Significant Accounting Policies Loans and Allowance for Credit Losses (Details) |
3 Months Ended |
|---|---|
Mar. 31, 2017 | |
| Loans and Allowance for Credit Losses [Abstract] | |
| Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status | 90 days |
| Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status | 60 days |
| Loans and Allowances for Credit Losses, Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off | 60 days |
| Loans and Allowances for Credit Losses, Maximum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off | 180 days |
| Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off | 60 days |
Significant Accounting Policies Newly Adopted and Pending Accounting Pronouncements (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||
| Share-based Compensation | $ (3,937) | $ 0 |
| Percentage of gross revenue of Transaction Card Revenue and Fiduciary and Asset Management Revenue | 18.00% | |
| Percentage of fees and commission revenue composed of Transaction Card Revenue and Fiduciary and Asset Management Revenue | 39.00% | |
Available for Sale Securities (Details) $ in Thousands |
3 Months Ended | ||||||||||||||||||||||||||||||||||
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Mar. 31, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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Mar. 31, 2016
USD ($)
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| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | $ 8,442,828 | $ 8,691,728 | $ 8,730,800 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 8,437,291 | 8,676,829 | 8,886,036 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 62,340 | [1] | 60,165 | [2] | 161,142 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (67,813) | [1] | (74,846) | [2] | (4,629) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | (64) | [4] | (218) | [5] | (1,277) | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 8,442,828 | 8,691,728 | 8,730,800 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 8,437,291 | 8,676,829 | 8,886,036 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | 1.85% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Proceeds | $ 240,010 | 469,382 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross realized gains | 2,092 | 3,964 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross realized losses | (43) | 0 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Related federal and state income tax expense | 797 | 1,542 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Pledged as Collateral [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Pledged As Collateral, Amortized cost | 6,647,659 | 7,353,116 | 7,307,788 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Pledged As Collateral, Fair value | $ 6,629,319 | $ 7,327,470 | $ 7,424,702 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 445 | 488 | 118 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 4,557,042 | $ 5,231,605 | $ 513,314 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 214,460 | 178,249 | 473,475 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4,771,502 | 5,409,854 | 986,789 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 62,863 | 70,818 | 1,824 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,014 | 4,246 | 4,082 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 67,877 | 75,064 | 5,906 | ||||||||||||||||||||||||||||||||
| Fixed Maturity Securities [Member] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis | 53,109 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis | 895,619 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis | 1,703,315 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis | 284,170 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 2,936,213 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value | 53,015 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value | 891,752 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value | 1,692,864 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value | 280,002 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date | $ 2,917,633 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield | 1.52% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield | 1.76% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield | 1.87% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield | 1.92% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | 1.82% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [7] | 6.93 | |||||||||||||||||||||||||||||||||
| U.S. Treasury | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | $ 1,000 | 1,000 | 1,000 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 999 | 999 | 1,003 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 0 | [1] | 0 | [2] | 3 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (1) | [1] | (1) | [2] | 0 | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis | 1,000 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 1,000 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 1,000 | 1,000 | 1,000 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value | 999 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date | 999 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 999 | $ 999 | 1,003 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield | 0.87% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | 0.87% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [7] | 0.79 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 | 1 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 999 | $ 999 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 999 | 999 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 1 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 | 1 | |||||||||||||||||||||||||||||||||
| Municipal and other tax-exempt securities | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 35,555 | 41,050 | 51,197 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 35,453 | 40,993 | 51,308 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 343 | [1] | 343 | [2] | 814 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (445) | [1] | (400) | [2] | (703) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis | 8,310 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis | 8,289 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis | 2,113 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis | 16,843 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 35,555 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 35,555 | 41,050 | 51,197 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value | 8,379 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value | 8,415 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value | 2,167 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value | 16,492 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date | 35,453 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 35,453 | $ 40,993 | $ 51,308 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield | [8] | 4.40% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield | [8] | 3.51% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield | [8] | 3.49% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield | [8],[9] | 2.28% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | [8] | 3.13% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [7] | 8.88 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation | 39.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset | 35 days | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 12 | 24 | 17 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 1,407 | $ 15,666 | $ 1,010 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 4,623 | 4,689 | 10,307 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,030 | 20,355 | 11,317 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 22 | 3 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 444 | 378 | 700 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 445 | 400 | 703 | ||||||||||||||||||||||||||||||||
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 2,895,258 | 3,035,750 | 2,904,149 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 2,877,028 | 3,017,933 | 2,942,404 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 4,883 | [1] | 5,472 | [2] | 39,518 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (23,113) | [1] | (23,289) | [2] | (1,263) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis | 43,799 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis | 887,330 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis | 1,701,202 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis | 262,927 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 2,895,258 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 2,895,258 | 3,035,750 | 2,904,149 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value | 43,637 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value | 883,337 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value | 1,690,697 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value | 259,357 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date | 2,877,028 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 2,877,028 | $ 3,017,933 | $ 2,942,404 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield | 0.99% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield | 1.75% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield | 1.87% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield | 1.87% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | 1.82% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [7] | 6.87 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 161 | 171 | 31 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 1,828,685 | $ 1,904,584 | $ 157,662 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 36,305 | 38,875 | 260,945 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,864,990 | 1,943,459 | 418,607 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22,758 | 22,987 | 197 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 355 | 302 | 1,066 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 23,113 | 23,289 | 1,263 | ||||||||||||||||||||||||||||||||
| Other debt securities | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 4,400 | 4,400 | 4,400 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 4,153 | 4,152 | 4,151 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 0 | [1] | 0 | [2] | 0 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (247) | [1] | (248) | [2] | (249) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis | 4,400 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 4,400 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 4,400 | 4,400 | 4,400 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value | 0 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value | 4,153 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Single Maturity Date | 4,153 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 4,153 | $ 4,152 | $ 4,151 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield | [9] | 1.71% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | 1.71% | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [7] | 30.41 | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 2 | 2 | 2 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 0 | $ 0 | $ 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 4,153 | 4,152 | 4,151 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4,153 | 4,152 | 4,151 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 247 | 248 | 249 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 247 | 248 | 249 | ||||||||||||||||||||||||||||||||
| Residential Mortgage Backed Securities [Member] | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 5,473,555 | 5,576,543 | 5,735,688 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 5,481,542 | 5,575,921 | 5,849,555 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 51,971 | [1] | 50,377 | [2] | 117,488 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (43,920) | [1] | (50,781) | [2] | (2,344) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | (64) | [4] | (218) | [5] | (1,277) | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 5,473,555 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 5,473,555 | 5,576,543 | 5,735,688 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 5,481,542 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 5,481,542 | $ 5,575,921 | $ 5,849,555 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | [10] | 1.88% | |||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities | 3 years 329 days | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 165 | 186 | 31 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,723,835 | $ 3,308,229 | $ 351,401 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 168,523 | 129,716 | 197,043 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,892,358 | 3,437,945 | 548,444 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 40,063 | 47,767 | 1,575 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,921 | 3,232 | 2,046 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 43,984 | 50,999 | 3,621 | ||||||||||||||||||||||||||||||||
| U.S. government agency residential mortgage-backed securities | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 5,380,183 | 5,475,351 | 5,612,675 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 5,372,916 | 5,460,386 | 5,716,525 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 36,639 | [1] | 35,800 | [2] | 106,135 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (43,906) | [1] | (50,765) | [2] | (2,285) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 5,380,183 | 5,475,351 | 5,612,675 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 5,372,916 | $ 5,460,386 | $ 5,716,525 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 159 | 180 | 17 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,717,030 | $ 3,300,298 | $ 335,362 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 155,062 | 116,208 | 180,459 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,872,092 | 3,416,506 | 515,821 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 40,026 | 47,593 | 1,379 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,880 | 3,172 | 906 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 43,906 | 50,765 | 2,285 | ||||||||||||||||||||||||||||||||
| U.S. government agency residential mortgage-backed securities | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 3,126,933 | 3,062,525 | 2,983,694 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 3,126,083 | 3,055,676 | 3,051,280 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 26,304 | [1] | 25,066 | [2] | 68,479 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (27,154) | [1] | (31,915) | [2] | (893) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 3,126,933 | 3,062,525 | 2,983,694 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 3,126,083 | $ 3,055,676 | $ 3,051,280 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 83 | 91 | 4 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 1,595,879 | $ 1,787,644 | $ 70,069 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 68,215 | 72,105 | 57,457 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,664,094 | 1,859,749 | 127,526 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 25,623 | 30,238 | 794 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,531 | 1,677 | 99 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 27,154 | 31,915 | 893 | ||||||||||||||||||||||||||||||||
| U.S. government agency residential mortgage-backed securities | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 1,401,752 | 1,534,451 | 1,870,002 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 1,399,011 | 1,531,116 | 1,903,789 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 7,836 | [1] | 8,475 | [2] | 34,098 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (10,577) | [1] | (11,810) | [2] | (311) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 1,401,752 | 1,534,451 | 1,870,002 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 1,399,011 | $ 1,531,116 | $ 1,903,789 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 51 | 58 | 1 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 795,586 | $ 964,017 | $ 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 17,284 | 18,307 | 23,914 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 812,870 | 982,324 | 23,914 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,001 | 11,210 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 576 | 600 | 311 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 10,577 | 11,810 | 311 | ||||||||||||||||||||||||||||||||
| U.S. government agency residential mortgage-backed securities | Government National Mortgage Association Certificates and Obligations (GNMA) [Member] | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 851,498 | 878,375 | 758,979 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 847,822 | 873,594 | 761,456 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 2,499 | [1] | 2,259 | [2] | 3,558 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (6,175) | [1] | (7,040) | [2] | (1,081) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 851,498 | 878,375 | 758,979 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 847,822 | $ 873,594 | $ 761,456 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 25 | 31 | 12 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 325,565 | $ 548,637 | $ 265,293 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 69,563 | 25,796 | 99,088 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 395,128 | 574,433 | 364,381 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,402 | 6,145 | 585 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,773 | 895 | 496 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 6,175 | 7,040 | 1,081 | ||||||||||||||||||||||||||||||||
| Privately issued residential mortgage-backed securities | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 93,372 | 101,192 | 123,013 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 108,626 | 115,535 | 133,030 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 15,332 | [1] | 14,577 | [2] | 11,353 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (14) | [1] | (16) | [2] | (59) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | (64) | [4] | (218) | [5] | (1,277) | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 93,372 | 101,192 | 123,013 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 108,626 | $ 115,535 | $ 133,030 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 6 | [11] | 6 | [12] | 14 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 6,805 | [11] | $ 7,931 | [12] | $ 16,039 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 13,461 | [11] | 13,508 | [12] | 16,584 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 20,266 | [11] | 21,439 | [12] | 32,623 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 37 | [11] | 174 | [12] | 196 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 41 | [11] | 60 | [12] | 1,140 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 78 | [11] | $ 234 | [12] | $ 1,336 | [13] | |||||||||||||||||||||||||||||
| Other Than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Assumptions Used to Develop Projected Cash Flows [Abstract] | |||||||||||||||||||||||||||||||||||
| Unemployment rate | Moving down to 4.5 percent over the next 12 months and remain at 4.5 percent thereafter. | Decreasing to 4.6 percent over the next 12 months and remain at 4.6 percent thereafter. | Moving down to 4.8 percent over the next 12 months and remain at 4.8 percent thereafter. | ||||||||||||||||||||||||||||||||
| Housing price appreciation/depreciation | [14] | Starting with current depreciated housing prices based on information derived from the FHFA1, appreciating 3.1 percent over the next 12 months, then flat for the following 12 months and then appreciating at 2 percent per year thereafter. | Starting with current depreciated housing prices based on information derived from the FHFA1, appreciating 3.1 percent over the next 12 months, then flat for the following 12 months and then appreciating at 2 percent per year thereafter. | Starting with current depreciated housing prices based on information derived from the FHFA1, appreciating 3.5 percent over the next 12 months, then flat for the following 12 months and then appreciating at 2 percent per year thereafter. | |||||||||||||||||||||||||||||||
| Estimated liquidation costs | Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company. | Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company. | Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company. | ||||||||||||||||||||||||||||||||
| Discount rates | Estimated cash flows were discounted at rates that range from 2.00 percent to 6.25 percent based on our current expected yields. | Estimated cash flows were discounted at rates that range from 2.00 percent to 6.25 percent based on our current expected yields. | Estimated cash flows were discounted at rates that range from 2.00 percent to 6.25 percent based on our current expected yields. | ||||||||||||||||||||||||||||||||
| Privately issued residential mortgage-backed securities | Alt A loans Member] | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | $ 41,090 | $ 44,245 | $ 54,288 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 48,883 | 51,512 | 59,049 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 7,857 | [1] | 7,485 | [2] | 5,434 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | 0 | [1] | 0 | [2] | 0 | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | (64) | [4] | (218) | [5] | (673) | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 41,090 | 44,245 | 54,288 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 48,883 | $ 51,512 | $ 59,049 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 5 | [11] | 5 | [12] | 5 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 6,805 | [11] | $ 7,931 | [12] | $ 8,870 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,848 | [11] | 7,410 | [12] | 8,625 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 14,653 | [11] | 15,341 | [12] | 17,495 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 37 | [11] | 174 | [12] | 137 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 27 | [11] | 44 | [12] | 536 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 64 | [11] | 218 | [12] | 673 | [13] | |||||||||||||||||||||||||||||
| Privately issued residential mortgage-backed securities | Jumbo A loans [Member] | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 52,282 | 56,947 | 68,725 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 59,743 | 64,023 | 73,981 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 7,475 | [1] | 7,092 | [2] | 5,919 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (14) | [1] | (16) | [2] | (59) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | (604) | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 52,282 | 56,947 | 68,725 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 59,743 | $ 64,023 | $ 73,981 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 | [11] | 1 | [12] | 9 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 0 | [11] | $ 0 | [12] | $ 7,169 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 5,613 | [11] | 6,098 | [12] | 7,959 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,613 | [11] | 6,098 | [12] | 15,128 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | [11] | 0 | [12] | 59 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14 | [11] | 16 | [12] | 604 | [13] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 14 | [11] | 16 | [12] | 663 | [13] | |||||||||||||||||||||||||||||
| Perpetual Preferred, Equity Securities and Mutual Funds [Member] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 33,060 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | $ 38,116 | ||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Nominal Yield | 0.00% | ||||||||||||||||||||||||||||||||||
| Perpetual preferred stock | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | $ 15,562 | 15,561 | 17,171 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 19,272 | 18,474 | 19,575 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 3,710 | [1] | 2,913 | [2] | 2,404 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | 0 | [1] | 0 | [2] | 0 | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 15,562 | 15,561 | 17,171 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 19,272 | $ 18,474 | $ 19,575 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 0 | $ 0 | $ 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Equity securities and mutual funds | |||||||||||||||||||||||||||||||||||
| Schedule of Available-for-sale Securities [Line Items] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | 17,498 | 17,424 | 17,195 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Fair Value | 18,844 | 18,357 | 18,040 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gain | 1,433 | [1] | 1,060 | [2] | 915 | [3] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Loss | (87) | [1] | (127) | [2] | (70) | [3] | |||||||||||||||||||||||||||||
| Available-for-Sale Securities, Other Than Temporary Impairments | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Amortized Cost | 17,498 | 17,424 | 17,195 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Fair Value | $ 18,844 | $ 18,357 | $ 18,040 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 104 | 104 | 37 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,116 | $ 2,127 | $ 3,241 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 856 | 817 | 1,029 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,972 | 2,944 | 4,270 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] | |||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 40 | 41 | 49 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 47 | 86 | 21 | ||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 87 | $ 127 | $ 70 | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||
Rollforward of Credit-Related Other-than-temporary Impairment Recognized in Earnings (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] | ||
| Balance of credit-related OTTI recognized on available for sale debt securities, beginning of period | $ 54,504,000 | $ 54,504,000 |
| Additions for credit-related OTTI not previously recognized | 0 | 0 |
| Additions for increases in credit-related OTTI previously recognized when there is no itnent to sell and no requirement to sell before recovery of amortized cost | 0 | 0 |
| Reductions for change in intent to hold before recovery | 0 | 0 |
| Sales | 0 | 0 |
| Balance of credit-related OTTI recognized on available for sale debt securities, end of period | 54,504,000 | $ 54,504,000 |
| Privately issued residential mortgage-backed securities | ||
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] | ||
| Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | 0 | |
| Perpetual Preferred, Equity Securities and Mutual Funds [Member] | ||
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] | ||
| Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 0 | |
Securities Fair Value Option Securities (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|---|---|---|---|
| Schedule of Fair Value Option Securities [Line Items] | |||
| Fair Value Option Securities, Fair Value | $ 441,714 | $ 77,046 | $ 418,887 |
| U.S. government agency residential mortgage-backed securities | |||
| Schedule of Fair Value Option Securities [Line Items] | |||
| Fair Value Option Securities, Fair Value | 441,714 | 77,046 | 418,887 |
| Fair Value Option Securities, Net Unrealized Gain or Loss | $ (1,646) | $ (1,777) | $ 4,136 |
Securities Restricted Equity Securities (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|---|---|---|---|
| Restricted Equity Securities [Abstract] | |||
| Federal Reserve stock | $ 36,498 | $ 36,498 | $ 36,148 |
| Federal Home Loan Bank stock | 247,194 | 270,541 | 278,271 |
| Other | 244 | 201 | 171 |
| Total | $ 283,936 | $ 307,240 | $ 314,590 |
Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | $ 304,727 | $ 689,872 | $ 790,146 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 276,422 | 664,531 | 705,578 | |||||||||
| Increase in cash margin obligation for derivative holdings with a decrease in credit rating from A1 to below investment grade | 10,000 | |||||||||||
| Not Designated as Hedging Instrument [Member] | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 20,047,451 | [1] | 22,437,314 | [2] | 19,792,138 | [3] | ||||||
| Derivative Liabilities, Notional | 18,107,686 | [1] | 22,178,359 | [2] | 19,101,068 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 371,995 | 789,791 | 873,951 | |||||||||
| Derivative Assets, Netting Adjustments | (62,384) | (89,368) | (67,119) | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 309,611 | 700,423 | 806,832 | |||||||||
| Derivative Assets, Cash Collateral | (4,884) | (10,551) | (16,686) | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 304,727 | 689,872 | 790,146 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 378,140 | 801,809 | 863,433 | |||||||||
| Derivative Liabilities, Netting Adjustments | (62,384) | (89,368) | (67,119) | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 315,756 | 712,441 | 796,314 | |||||||||
| Derivative Liabilities, Cash Collateral | (39,334) | (47,910) | (90,736) | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 276,422 | 664,531 | 705,578 | |||||||||
| Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 14,549,828 | [1] | 16,949,152 | [2] | 16,235,517 | [3] | ||||||
| Derivative Liabilities, Notional | 14,322,223 | [1] | 16,637,532 | [2] | 16,323,807 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 80,272 | 180,695 | 111,188 | |||||||||
| Derivative Assets, Netting Adjustments | (33,143) | (60,555) | (44,570) | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 47,129 | 120,140 | 66,618 | |||||||||
| Derivative Assets, Cash Collateral | 0 | 0 | 0 | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 47,129 | 120,140 | 66,618 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 76,971 | 176,928 | 107,541 | |||||||||
| Derivative Liabilities, Netting Adjustments | (33,143) | (60,555) | (44,570) | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 43,828 | 116,373 | 62,971 | |||||||||
| Derivative Liabilities, Cash Collateral | (34,310) | 0 | (61,380) | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 9,518 | 116,373 | 1,591 | |||||||||
| Not Designated as Hedging Instrument [Member] | Interest rate swaps | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 1,491,414 | [1] | 1,403,408 | [2] | 1,335,259 | [3] | ||||||
| Derivative Liabilities, Notional | 1,491,414 | [1] | 1,403,408 | [2] | 1,335,259 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 32,286 | 34,442 | 48,270 | |||||||||
| Derivative Assets, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 32,286 | 34,442 | 48,270 | |||||||||
| Derivative Assets, Cash Collateral | (3,349) | (4,567) | 0 | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 28,937 | 29,875 | 48,270 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 33,036 | 34,442 | 48,619 | |||||||||
| Derivative Liabilities, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 33,036 | 34,442 | 48,619 | |||||||||
| Derivative Liabilities, Cash Collateral | 0 | (11,977) | (28,572) | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 33,036 | 22,465 | 20,047 | |||||||||
| Not Designated as Hedging Instrument [Member] | Energy contracts | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 886,699 | [1] | 835,566 | [2] | 533,355 | [3] | ||||||
| Derivative Liabilities, Notional | 844,406 | [1] | 820,365 | [2] | 526,103 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 42,598 | 64,140 | 62,365 | |||||||||
| Derivative Assets, Netting Adjustments | (28,455) | (28,298) | (21,374) | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 14,143 | 35,842 | 40,991 | |||||||||
| Derivative Assets, Cash Collateral | (543) | (71) | (11,340) | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 13,600 | 35,771 | 29,651 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 40,604 | 64,306 | 62,528 | |||||||||
| Derivative Liabilities, Netting Adjustments | (28,455) | (28,298) | (21,374) | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 12,149 | 36,008 | 41,154 | |||||||||
| Derivative Liabilities, Cash Collateral | (258) | (31,534) | 0 | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 11,891 | 4,474 | 41,154 | |||||||||
| Not Designated as Hedging Instrument [Member] | Agricultural contracts | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 51,679 | [1] | 53,209 | [2] | 104,927 | [3] | ||||||
| Derivative Liabilities, Notional | 51,509 | [1] | 53,216 | [2] | 104,922 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 2,031 | 1,382 | 1,859 | |||||||||
| Derivative Assets, Netting Adjustments | (786) | (515) | (1,175) | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 1,245 | 867 | 684 | |||||||||
| Derivative Assets, Cash Collateral | 0 | 0 | 0 | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 1,245 | 867 | 684 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 2,015 | 1,365 | 1,847 | |||||||||
| Derivative Liabilities, Netting Adjustments | (786) | (515) | (1,175) | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 1,229 | 850 | 672 | |||||||||
| Derivative Liabilities, Cash Collateral | (1,040) | (769) | (420) | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 189 | 81 | 252 | |||||||||
| Not Designated as Hedging Instrument [Member] | Foreign exchange contracts | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 211,837 | [1] | 580,886 | [2] | 682,457 | [3] | ||||||
| Derivative Liabilities, Notional | 208,236 | [1] | 580,712 | [2] | 682,354 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 204,774 | 494,349 | 639,322 | |||||||||
| Derivative Assets, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 204,774 | 494,349 | 639,322 | |||||||||
| Derivative Assets, Cash Collateral | (72) | (5,183) | (4,970) | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 204,702 | 489,166 | 634,352 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 201,043 | 494,695 | 638,892 | |||||||||
| Derivative Liabilities, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 201,043 | 494,695 | 638,892 | |||||||||
| Derivative Liabilities, Cash Collateral | (3,726) | (3,630) | (364) | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 197,317 | 491,065 | 638,528 | |||||||||
| Not Designated as Hedging Instrument [Member] | Equity option contracts | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 99,031 | [1] | 100,924 | [2] | 128,623 | [3] | ||||||
| Derivative Liabilities, Notional | 99,031 | [1] | 100,924 | [2] | 128,623 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 4,505 | 4,357 | 4,006 | |||||||||
| Derivative Assets, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 4,505 | 4,357 | 4,006 | |||||||||
| Derivative Assets, Cash Collateral | (920) | (730) | (376) | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 3,585 | 3,627 | 3,630 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 4,505 | 4,357 | 4,006 | |||||||||
| Derivative Liabilities, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 4,505 | 4,357 | 4,006 | |||||||||
| Derivative Liabilities, Cash Collateral | 0 | 0 | 0 | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 4,505 | 4,357 | 4,006 | |||||||||
| Not Designated as Hedging Instrument [Member] | Total customer risk management programs | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 17,290,488 | [1] | 19,923,145 | [2] | 19,020,138 | [3] | ||||||
| Derivative Liabilities, Notional | 17,016,819 | [1] | 19,596,157 | [2] | 19,101,068 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 366,466 | 779,365 | 867,010 | |||||||||
| Derivative Assets, Netting Adjustments | (62,384) | (89,368) | (67,119) | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 304,082 | 689,997 | 799,891 | |||||||||
| Derivative Assets, Cash Collateral | (4,884) | (10,551) | (16,686) | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 299,198 | 679,446 | 783,205 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 358,174 | 776,093 | 863,433 | |||||||||
| Derivative Liabilities, Netting Adjustments | (62,384) | (89,368) | (67,119) | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 295,790 | 686,725 | 796,314 | |||||||||
| Derivative Liabilities, Cash Collateral | (39,334) | (47,910) | (90,736) | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | 256,456 | 638,815 | 705,578 | |||||||||
| Not Designated as Hedging Instrument [Member] | Internal risk management programs | ||||||||||||
| Notional Amount of Derivatives [Abstract] | ||||||||||||
| Derivative Assets, Notional | 2,756,963 | [1] | 2,514,169 | [2] | 772,000 | [3] | ||||||
| Derivative Liabilities, Notional | 1,090,867 | [1] | 2,582,202 | [2] | 0 | [3] | ||||||
| Derivative Assets, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Assets, Gross Fair Value | 5,529 | 10,426 | 6,941 | |||||||||
| Derivative Assets, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Assets, Net Fair Value Before Cash Collateral | 5,529 | 10,426 | 6,941 | |||||||||
| Derivative Assets, Cash Collateral | 0 | 0 | 0 | |||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 5,529 | 10,426 | 6,941 | |||||||||
| Derivative Liabilities, Fair Value, Net [Abstract] | ||||||||||||
| Derivative Liabilities, Gross Fair Value | 19,966 | 25,716 | 0 | |||||||||
| Derivative Liabilities, Netting Adjustments | 0 | 0 | 0 | |||||||||
| Derivative Liabilities, Net Fair Value Before Cash Collateral | 19,966 | 25,716 | 0 | |||||||||
| Derivative Liabilities, Cash Collateral | 0 | 0 | 0 | |||||||||
| Derivative Liabilities, Fair Value, Net of Cash Collateral | $ 19,966 | $ 25,716 | $ 0 | |||||||||
| ||||||||||||
Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | $ 11,171 | $ 8,868 |
| Gain (Loss) on Derivatives, Net | (450) | 7,138 |
| To-be-announced residential mortgage-backed securities | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 8,027 | 7,440 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Interest rate swaps | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 459 | 325 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Energy contracts | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 2,873 | 696 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Agricultural contracts | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 9 | 29 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Foreign exchange contracts | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 270 | 378 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Equity option contracts | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 0 | 0 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Total customer risk management programs | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | 11,638 | 8,868 |
| Gain (Loss) on Derivatives, Net | 0 | 0 |
| Internal risk management programs | ||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] | ||
| Brokergage and Trading Revenue | (467) | 0 |
| Gain (Loss) on Derivatives, Net | $ (450) | $ 7,138 |
Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|||
| Loan receivables disclosure [Abstract] | |||||
| Loans, fixed rate of interest | $ 4,557,055 | $ 4,753,600 | $ 4,255,588 | ||
| Loans, variable rate of interest | 12,227,235 | 12,005,076 | 11,525,148 | ||
| Loans, non-accrual | 207,616 | 230,984 | 241,830 | ||
| Total | 16,991,906 | 16,989,660 | 16,022,566 | ||
| Accruing loans past due (90 days) | [1] | 95 | 5 | 8,019 | |
| Credit Commitments [Abstract] | |||||
| Outstanding commitments to extend credit | 9,400,000 | ||||
| Outstanding standby letters of credit | 596,000 | ||||
| Outstanding commercial letters of credit | 3,800 | ||||
| Texas [Member] | Geographic Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 5,500,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan portfolio attributed to Texas (in hundredths) | 33.00% | ||||
| Oklahoma [Member] | Geographic Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 3,300,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan portfolio attributed to Oklahoma (in hundredths) | 20.00% | ||||
| Commercial | |||||
| Loan receivables disclosure [Abstract] | |||||
| Loans, fixed rate of interest | $ 2,201,040 | 2,327,085 | 1,932,757 | ||
| Loans, variable rate of interest | 7,969,245 | 7,884,786 | 8,181,016 | ||
| Loans, non-accrual | 156,825 | 178,953 | 174,652 | ||
| Total | 10,327,110 | 10,390,824 | 10,288,425 | ||
| Commercial | Texas [Member] | Geographic Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 3,400,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan portfolio attributed to Texas (in hundredths) | 33.00% | ||||
| Commercial | Oklahoma [Member] | Geographic Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 1,900,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan portfolio attributed to Oklahoma (in hundredths) | 19.00% | ||||
| Commercial | Energy [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 2,537,112 | 2,497,868 | 3,029,420 | ||
| Commercial | Energy [Member] | Credit Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 2,500,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan class to total loans | 15.00% | ||||
| Commercial | Energy Producers [Member] | Credit Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 2,000,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of committed energy production loans secured by oil | 58.00% | ||||
| Percentage of committed energy production loans secured by natural gas | 42.00% | ||||
| Commercial | Services [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 3,013,375 | 3,108,990 | 2,728,891 | ||
| Commercial | Services [Member] | Credit Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 3,000,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan class to total loans | 18.00% | ||||
| Amount of loans with individual balances less than $10 million | $ 1,400,000 | ||||
| Maximum loan amount for certain individual loans in category | 10,000 | ||||
| Commercial | Healthcare [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | 2,265,604 | 2,201,916 | 1,995,425 | ||
| Commercial | Healthcare [Member] | Credit Concentration Risk [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 2,300,000 | ||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan class to total loans | 13.00% | ||||
| Commercial real estate | |||||
| Loan receivables disclosure [Abstract] | |||||
| Loans, fixed rate of interest | $ 590,375 | 624,187 | 643,033 | ||
| Loans, variable rate of interest | 3,276,213 | 3,179,338 | 2,718,204 | ||
| Loans, non-accrual | 4,475 | 5,521 | 9,270 | ||
| Total | $ 3,871,063 | 3,809,046 | 3,370,507 | ||
| Commercial real estate | Texas [Member] | Geographic Concentration Risk [Member] | |||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan portfolio secured by property in Texas (in hundredths) | 31.00% | ||||
| Commercial real estate | Oklahoma [Member] | Geographic Concentration Risk [Member] | |||||
| Loans receivable, other information [Abstract] | |||||
| Percentage of loan portfolio secured by property in Oklahoma (in hundredths) | 12.00% | ||||
| Residential mortgage | |||||
| Loan receivables disclosure [Abstract] | |||||
| Loans, fixed rate of interest | $ 1,616,328 | 1,647,357 | 1,592,706 | ||
| Loans, variable rate of interest | 283,865 | 256,255 | 219,026 | ||
| Loans, non-accrual | 46,081 | 46,220 | 57,577 | ||
| Total | 1,946,274 | 1,949,832 | 1,869,309 | ||
| Residential mortgage | Permanent mortgage [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 977,743 | 1,006,820 | 948,405 | ||
| Loans receivable, other information [Abstract] | |||||
| Minimum FICO required for jumbo loan approval | 720 | ||||
| Maximum debt-to-income ratio on jumbo loans (in hundredths) | 38.00% | ||||
| Minimum loan-to-value ratio on jumbo loans (in hundredths) | 60.00% | ||||
| Maximum loan-to-value ratio on jumbo loans (in hundredths) | 100.00% | ||||
| Minimum period for fixed rate on variable rate jumbo loans (in years) | 3 years | ||||
| Maximum period for fixed rate on variable rate jumbo loans (in years) | 10 years | ||||
| Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 204,181 | 199,387 | 197,350 | ||
| Loans receivable, other information [Abstract] | |||||
| Amount of loans guaranteed by US government and previously sold into GNMA mortgage pools | 204,000 | ||||
| Residential mortgage | Home equity [Member] | |||||
| Loan receivables disclosure [Abstract] | |||||
| Total | $ 764,350 | 743,625 | 723,554 | ||
| Loans receivable, other information [Abstract] | |||||
| Percentage of home equity portfolio comprised of first lien loans | 66.00% | ||||
| Percentage of home equity portfolio comprised of junior lien loans | 34.00% | ||||
| Percentage of junior lien home equity loans that are amortizing term loans | 51.00% | ||||
| Percentage of junior lien home equity loans that are revolving lines of credit | 49.00% | ||||
| Home equity loans, description | Home equity loans generally require a minimum FICO score of 700 and a maximum DTI of 40 percent. | ||||
| Home equity loans, maximum | $ 400 | ||||
| Home equity loans, revolving period | 5 years | ||||
| Home equity loans, amortization period following revolving period | 15 years | ||||
| Home equity loans, discretionary additional revolving period | 5 years | ||||
| Personal | |||||
| Loan receivables disclosure [Abstract] | |||||
| Loans, fixed rate of interest | $ 149,312 | 154,971 | 87,092 | ||
| Loans, variable rate of interest | 697,912 | 684,697 | 406,902 | ||
| Loans, non-accrual | 235 | 290 | 331 | ||
| Total | $ 847,459 | $ 839,958 | $ 494,325 | ||
| |||||
Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | $ 246,159 | $ 225,524 | |||
| Provision for loan losses | 1,804 | 30,104 | |||
| Loans charged off | (2,153) | (23,991) | |||
| Recoveries | 2,900 | 1,519 | |||
| Ending balance | 248,710 | 233,156 | |||
| Allowance for off-balance sheet credit losses [Roll Forward] | |||||
| Beginning balance | 11,244 | 1,711 | |||
| Provision for off-balance sheet credit losses | (1,804) | 4,896 | |||
| Ending balance | 9,440 | 6,607 | |||
| Total provision for credit losses | 0 | 35,000 | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | $ 16,784,290 | $ 16,758,676 | $ 15,780,736 | ||
| Individually measured for impairment, recorded investment | 207,616 | 230,984 | 241,830 | ||
| Total | 16,991,906 | 16,989,660 | 16,022,566 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 217,886 | 217,116 | 205,049 | ||
| Individually measured for impairment, related allowance | 3,497 | 843 | 2,686 | ||
| Total | 246,159 | 225,524 | 248,710 | 246,159 | 233,156 |
| Commercial | |||||
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | 140,213 | 130,334 | |||
| Provision for loan losses | (3,355) | 31,097 | |||
| Loans charged off | (424) | (22,126) | |||
| Recoveries | 1,182 | 488 | |||
| Ending balance | 137,616 | 139,793 | |||
| Allowance for off-balance sheet credit losses [Roll Forward] | |||||
| Beginning balance | 11,063 | 1,506 | |||
| Provision for off-balance sheet credit losses | (1,775) | 4,813 | |||
| Ending balance | 9,288 | 6,319 | |||
| Total provision for credit losses | (5,130) | 35,910 | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | 10,170,285 | 10,211,871 | 10,113,773 | ||
| Individually measured for impairment, recorded investment | 156,825 | 178,953 | 174,652 | ||
| Total | 10,327,110 | 10,390,824 | 10,288,425 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 134,164 | 139,416 | 137,191 | ||
| Individually measured for impairment, related allowance | 3,452 | 797 | 2,602 | ||
| Total | 140,213 | 130,334 | 137,616 | 140,213 | 139,793 |
| Commercial real estate | |||||
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | 50,749 | 41,391 | |||
| Provision for loan losses | 6,859 | 2,977 | |||
| Loans charged off | 0 | 0 | |||
| Recoveries | 735 | 85 | |||
| Ending balance | 58,343 | 44,453 | |||
| Allowance for off-balance sheet credit losses [Roll Forward] | |||||
| Beginning balance | 123 | 153 | |||
| Provision for off-balance sheet credit losses | (17) | 75 | |||
| Ending balance | 106 | 228 | |||
| Total provision for credit losses | 6,842 | 3,052 | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | 3,866,588 | 3,803,525 | 3,361,237 | ||
| Individually measured for impairment, recorded investment | 4,475 | 5,521 | 9,270 | ||
| Total | 3,871,063 | 3,809,046 | 3,370,507 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 58,343 | 50,749 | 44,435 | ||
| Individually measured for impairment, related allowance | 0 | 0 | 18 | ||
| Total | 50,749 | 41,391 | 58,343 | 50,749 | 44,453 |
| Residential mortgage | |||||
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | 18,224 | 19,509 | |||
| Provision for loan losses | (39) | (731) | |||
| Loans charged off | (236) | (474) | |||
| Recoveries | 228 | 163 | |||
| Ending balance | 18,177 | 18,467 | |||
| Allowance for off-balance sheet credit losses [Roll Forward] | |||||
| Beginning balance | 50 | 30 | |||
| Provision for off-balance sheet credit losses | (10) | 28 | |||
| Ending balance | 40 | 58 | |||
| Total provision for credit losses | (49) | (703) | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | 1,900,193 | 1,903,612 | 1,811,732 | ||
| Individually measured for impairment, recorded investment | 46,081 | 46,220 | 57,577 | ||
| Total | 1,946,274 | 1,949,832 | 1,869,309 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 18,132 | 18,178 | 18,401 | ||
| Individually measured for impairment, related allowance | 45 | 46 | 66 | ||
| Total | 18,224 | 19,509 | 18,177 | 18,224 | 18,467 |
| Personal | |||||
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | 8,773 | 4,164 | |||
| Provision for loan losses | (788) | 1,466 | |||
| Loans charged off | (1,493) | (1,391) | |||
| Recoveries | 755 | 783 | |||
| Ending balance | 7,247 | 5,022 | |||
| Allowance for off-balance sheet credit losses [Roll Forward] | |||||
| Beginning balance | 8 | 22 | |||
| Provision for off-balance sheet credit losses | (2) | (20) | |||
| Ending balance | 6 | 2 | |||
| Total provision for credit losses | (790) | 1,446 | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | 847,224 | 839,668 | 493,994 | ||
| Individually measured for impairment, recorded investment | 235 | 290 | 331 | ||
| Total | 847,459 | 839,958 | 494,325 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 7,247 | 8,773 | 5,022 | ||
| Individually measured for impairment, related allowance | 0 | 0 | 0 | ||
| Total | 8,773 | 4,164 | 7,247 | 8,773 | 5,022 |
| Specific Allowance [Member] | |||||
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | 217,959 | ||||
| Ending balance | 221,383 | 207,735 | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | 16,784,290 | 16,758,676 | 15,780,736 | ||
| Individually measured for impairment, recorded investment | 207,616 | 230,984 | 241,830 | ||
| Total | 16,991,906 | 16,989,660 | 16,022,566 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 217,886 | 217,116 | 205,049 | ||
| Individually measured for impairment, related allowance | 3,497 | 843 | 2,686 | ||
| Total | 217,959 | 207,735 | 221,383 | 217,959 | 207,735 |
| Nonspecific Allowance [Member] | |||||
| Allowance for loan losses [Roll Forward] | |||||
| Beginning balance | 28,200 | 30,126 | |||
| Provision for loan losses | (873) | (4,705) | |||
| Loans charged off | 0 | 0 | |||
| Recoveries | 0 | 0 | |||
| Ending balance | 27,327 | 25,421 | |||
| Allowance for off-balance sheet credit losses [Roll Forward] | |||||
| Beginning balance | 0 | 0 | |||
| Provision for off-balance sheet credit losses | 0 | 0 | |||
| Ending balance | 0 | 0 | |||
| Total provision for credit losses | (873) | (4,705) | |||
| Recorded investment [Abstract] | |||||
| Collectively measured for impairment, recorded investment | 0 | 0 | 0 | ||
| Individually measured for impairment, recorded investment | 0 | 0 | 0 | ||
| Total | 0 | 0 | 0 | ||
| Related allowance [Abstract] | |||||
| Collectively measured for impairment, related allowance | 0 | 0 | 0 | ||
| Individually measured for impairment, related allowance | 0 | 0 | 0 | ||
| Total | $ 28,200 | $ 30,126 | $ 27,327 | $ 28,200 | $ 25,421 |
Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|---|
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | $ 15,134,711 | $ 15,158,076 | $ 14,238,448 | |
| Non-Graded, Recorded Investment | 1,857,195 | 1,831,584 | 1,784,118 | |
| Total | 16,991,906 | 16,989,660 | 16,022,566 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 203,109 | 197,970 | 189,116 | |
| Non-Graded, Allowance | 18,274 | 19,989 | 18,619 | |
| Total | 248,710 | 246,159 | 233,156 | $ 225,524 |
| Commercial | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 10,302,774 | 10,360,725 | 10,264,965 | |
| Non-Graded, Recorded Investment | 24,336 | 30,099 | 23,460 | |
| Total | 10,327,110 | 10,390,824 | 10,288,425 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 136,672 | 139,293 | 138,887 | |
| Non-Graded, Allowance | 944 | 920 | 906 | |
| Total | 137,616 | 140,213 | 139,793 | 130,334 |
| Commercial | Energy [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 2,537,112 | 2,497,868 | 3,029,420 | |
| Commercial | Services [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 3,013,375 | 3,108,990 | 2,728,891 | |
| Commercial | Wholesale/retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 1,506,243 | 1,576,818 | 1,451,846 | |
| Commercial | Manufacturing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 543,430 | 514,975 | 600,645 | |
| Commercial | Healthcare [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 2,265,604 | 2,201,916 | 1,995,425 | |
| Commercial | Other commercial and industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 461,346 | 490,257 | 482,198 | |
| Commercial real estate | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 3,871,063 | 3,809,046 | 3,370,507 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Total | 3,871,063 | 3,809,046 | 3,370,507 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 58,343 | 50,749 | 44,453 | |
| Non-Graded, Allowance | 0 | 0 | 0 | |
| Total | 58,343 | 50,749 | 44,453 | 41,391 |
| Commercial real estate | Residential construction and land development [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 135,994 | 135,533 | 171,949 | |
| Commercial real estate | Retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 745,046 | 761,888 | 810,522 | |
| Commercial real estate | Office [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 860,889 | 798,888 | 695,552 | |
| Commercial real estate | Multifamily [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 922,991 | 903,272 | 733,689 | |
| Commercial real estate | Industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 871,463 | 871,749 | 564,467 | |
| Commercial real estate | Other commercial real estate [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 334,680 | 337,716 | 394,328 | |
| Residential mortgage | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 211,846 | 243,703 | 192,658 | |
| Non-Graded, Recorded Investment | 1,734,428 | 1,706,129 | 1,676,651 | |
| Total | 1,946,274 | 1,949,832 | 1,869,309 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 2,958 | 2,893 | 2,822 | |
| Non-Graded, Allowance | 15,219 | 15,331 | 15,645 | |
| Total | 18,177 | 18,224 | 18,467 | 19,509 |
| Residential mortgage | Permanent mortgage [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 977,743 | 1,006,820 | 948,405 | |
| Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 204,181 | 199,387 | 197,350 | |
| Residential mortgage | Home equity [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Total | 764,350 | 743,625 | 723,554 | |
| Personal | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 749,028 | 744,602 | 410,318 | |
| Non-Graded, Recorded Investment | 98,431 | 95,356 | 84,007 | |
| Total | 847,459 | 839,958 | 494,325 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 5,136 | 5,035 | 2,954 | |
| Non-Graded, Allowance | 2,111 | 3,738 | 2,068 | |
| Total | 7,247 | 8,773 | 5,022 | 4,164 |
| Specific Allowance [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 15,134,711 | 15,158,076 | 14,238,448 | |
| Non-Graded, Recorded Investment | 1,857,195 | 1,831,584 | 1,784,118 | |
| Total | 16,991,906 | 16,989,660 | 16,022,566 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 203,109 | 197,970 | 189,116 | |
| Non-Graded, Allowance | 18,274 | 19,989 | 18,619 | |
| Total | 221,383 | 217,959 | 207,735 | |
| Nonspecific Allowance [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Total | 0 | 0 | 0 | |
| Related Allowance [Abstract] | ||||
| Internally Risk Graded, Allowance | 0 | 0 | 0 | |
| Non-Graded, Allowance | 0 | 0 | 0 | |
| Total | 27,327 | 28,200 | 25,421 | $ 30,126 |
| Performing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 1,812,686 | 1,786,530 | 1,728,595 | |
| Performing [Member] | Commercial | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 24,292 | 30,041 | 23,376 | |
| Performing [Member] | Commercial | Energy [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial | Services [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial | Wholesale/retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial | Manufacturing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial | Healthcare [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial | Other commercial and industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 24,292 | 30,041 | 23,376 | |
| Performing [Member] | Commercial real estate | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial real estate | Residential construction and land development [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial real estate | Retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial real estate | Office [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial real estate | Multifamily [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial real estate | Industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Commercial real estate | Other commercial real estate [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Residential mortgage | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 1,690,107 | 1,661,326 | 1,621,420 | |
| Performing [Member] | Residential mortgage | Permanent mortgage [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 743,469 | 741,679 | 730,596 | |
| Performing [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 194,000 | 188,000 | 178,000 | |
| Performing [Member] | Residential mortgage | Home equity [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 752,565 | 732,106 | 713,024 | |
| Performing [Member] | Personal | ||||
| Recorded Investment [Abstract] | ||||
| Non-Graded, Recorded Investment | 98,287 | 95,163 | 83,799 | |
| Performing [Member] | Pass [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 14,325,721 | 14,343,507 | 13,253,092 | |
| Performing [Member] | Pass [Member] | Commercial | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 9,517,665 | 9,567,816 | 9,311,219 | |
| Performing [Member] | Pass [Member] | Commercial | Energy [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,988,392 | 1,937,790 | 2,197,870 | |
| Performing [Member] | Pass [Member] | Commercial | Services [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 2,960,912 | 3,052,002 | 2,706,395 | |
| Performing [Member] | Pass [Member] | Commercial | Wholesale/retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,459,703 | 1,535,463 | 1,415,832 | |
| Performing [Member] | Pass [Member] | Commercial | Manufacturing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 504,824 | 468,314 | 567,618 | |
| Performing [Member] | Pass [Member] | Commercial | Healthcare [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 2,196,517 | 2,140,458 | 1,970,331 | |
| Performing [Member] | Pass [Member] | Commercial | Other commercial and industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 407,317 | 433,789 | 453,173 | |
| Performing [Member] | Pass [Member] | Commercial real estate | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 3,852,170 | 3,793,471 | 3,345,816 | |
| Performing [Member] | Pass [Member] | Commercial real estate | Residential construction and land development [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 132,127 | 131,630 | 164,931 | |
| Performing [Member] | Pass [Member] | Commercial real estate | Retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 738,978 | 756,418 | 802,796 | |
| Performing [Member] | Pass [Member] | Commercial real estate | Office [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 857,582 | 798,462 | 694,670 | |
| Performing [Member] | Pass [Member] | Commercial real estate | Multifamily [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 918,542 | 898,800 | 726,933 | |
| Performing [Member] | Pass [Member] | Commercial real estate | Industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 871,387 | 871,673 | 564,391 | |
| Performing [Member] | Pass [Member] | Commercial real estate | Other commercial real estate [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 333,554 | 336,488 | 392,095 | |
| Performing [Member] | Pass [Member] | Residential mortgage | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 207,886 | 238,769 | 185,963 | |
| Performing [Member] | Pass [Member] | Residential mortgage | Permanent mortgage [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 207,886 | 238,769 | 185,963 | |
| Performing [Member] | Pass [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Pass [Member] | Residential mortgage | Home equity [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Pass [Member] | Personal | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 748,000 | 743,451 | 410,094 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 232,727 | 229,673 | 338,846 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 222,320 | 223,742 | 330,079 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Energy [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 144,157 | 119,583 | 269,039 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Services [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 13,931 | 10,960 | 6,099 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Wholesale/retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 21,970 | 16,886 | 12,383 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Manufacturing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,917 | 26,532 | 21,209 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Healthcare [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 35,704 | 44,472 | 16,267 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Other commercial and industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 4,641 | 5,309 | 5,082 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 8,648 | 4,745 | 7,563 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Residential construction and land development [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 1,306 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 5,754 | 4,745 | 6,004 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Office [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 2,894 | 0 | 253 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Multifamily [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Other commercial real estate [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,710 | 1,186 | 1,203 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Permanent mortgage [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,710 | 1,186 | 1,203 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Home equity [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Other Loans Especially Mentioned [Member] | Personal | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 49 | 0 | 1 | |
| Performing [Member] | Substandard [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 413,156 | 398,966 | 460,203 | |
| Performing [Member] | Substandard [Member] | Commercial | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 406,008 | 390,272 | 449,099 | |
| Performing [Member] | Substandard [Member] | Commercial | Energy [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 294,138 | 307,996 | 402,958 | |
| Performing [Member] | Substandard [Member] | Commercial | Services [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 30,819 | 37,855 | 6,885 | |
| Performing [Member] | Substandard [Member] | Commercial | Wholesale/retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 13,480 | 13,062 | 19,946 | |
| Performing [Member] | Substandard [Member] | Commercial | Manufacturing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 30,782 | 15,198 | 11,506 | |
| Performing [Member] | Substandard [Member] | Commercial | Healthcare [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 32,474 | 16,161 | 7,804 | |
| Performing [Member] | Substandard [Member] | Commercial | Other commercial and industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 4,315 | 0 | 0 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 5,770 | 5,309 | 7,858 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | Residential construction and land development [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,251 | 470 | 923 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | Retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 399 | 420 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | Office [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | Multifamily [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 4,425 | 4,434 | 6,506 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | Industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Substandard [Member] | Commercial real estate | Other commercial real estate [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 94 | 6 | 9 | |
| Performing [Member] | Substandard [Member] | Residential mortgage | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 490 | 2,331 | 3,146 | |
| Performing [Member] | Substandard [Member] | Residential mortgage | Permanent mortgage [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 490 | 2,331 | 3,146 | |
| Performing [Member] | Substandard [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Substandard [Member] | Residential mortgage | Home equity [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Performing [Member] | Substandard [Member] | Personal | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 888 | 1,054 | 100 | |
| Nonaccrual [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 163,107 | 185,930 | 186,307 | |
| Non-Graded, Recorded Investment | 44,509 | 45,054 | 55,523 | |
| Nonaccrual [Member] | Commercial | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 156,781 | 178,895 | 174,568 | |
| Non-Graded, Recorded Investment | 44 | 58 | 84 | |
| Nonaccrual [Member] | Commercial | Energy [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 110,425 | 132,499 | 159,553 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Services [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 7,713 | 8,173 | 9,512 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Wholesale/retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 11,090 | 11,407 | 3,685 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Manufacturing [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 5,907 | 4,931 | 312 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Healthcare [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 909 | 825 | 1,023 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Other commercial and industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 20,737 | 21,060 | 483 | |
| Non-Graded, Recorded Investment | 44 | 58 | 84 | |
| Nonaccrual [Member] | Commercial real estate | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 4,475 | 5,521 | 9,270 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Residential construction and land development [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 2,616 | 3,433 | 4,789 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Retail [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 314 | 326 | 1,302 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Office [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 413 | 426 | 629 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Multifamily [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 24 | 38 | 250 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Industrial [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 76 | 76 | 76 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Other commercial real estate [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,032 | 1,222 | 2,224 | |
| Non-Graded, Recorded Investment | 0 | 0 | 0 | |
| Nonaccrual [Member] | Residential mortgage | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,760 | 1,417 | 2,346 | |
| Non-Graded, Recorded Investment | 44,321 | 44,803 | 55,231 | |
| Nonaccrual [Member] | Residential mortgage | Permanent mortgage [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 1,760 | 1,417 | 2,346 | |
| Non-Graded, Recorded Investment | 22,428 | 21,438 | 25,151 | |
| Nonaccrual [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Non-Graded, Recorded Investment | 10,000 | 12,000 | 20,000 | |
| Nonaccrual [Member] | Residential mortgage | Home equity [Member] | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 0 | 0 | 0 | |
| Non-Graded, Recorded Investment | 11,785 | 11,519 | 10,530 | |
| Nonaccrual [Member] | Personal | ||||
| Recorded Investment [Abstract] | ||||
| Internally Risk Graded, Recorded Investment | 91 | 97 | 123 | |
| Non-Graded, Recorded Investment | $ 144 | $ 193 | $ 208 |
Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($) $ in Thousands |
3 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | $ 451,653 | $ 485,090 | $ 473,526 | |||||||||
| Impaired loans, recorded investment, total | 401,689 | 419,630 | 418,525 | |||||||||
| Impaired loans, recorded investment with no related allowance | 349,526 | 384,749 | 407,363 | |||||||||
| Impaired loans, recorded investment with related allowance | 52,163 | 34,881 | 11,162 | |||||||||
| Impaired loans, related allowance | 3,497 | 2,686 | 843 | |||||||||
| Impaired loans, average recorded investment | 415,718 | 356,708 | ||||||||||
| Impaired loans, interest income recognized | 2,195 | 2,099 | ||||||||||
| Commercial | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 191,335 | 214,781 | 211,762 | |||||||||
| Impaired loans, recorded investment, total | 156,825 | 174,652 | 178,953 | |||||||||
| Impaired loans, recorded investment with no related allowance | 104,707 | 140,041 | 167,837 | |||||||||
| Impaired loans, recorded investment with related allowance | 52,118 | 34,611 | 11,116 | |||||||||
| Impaired loans, related allowance | 3,452 | 2,602 | 797 | |||||||||
| Impaired loans, average recorded investment | 167,889 | 108,795 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial | Energy [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 125,579 | 182,224 | 146,897 | |||||||||
| Impaired loans, recorded investment, total | 110,425 | 159,553 | 132,499 | |||||||||
| Impaired loans, recorded investment with no related allowance | 58,324 | 125,072 | 121,418 | |||||||||
| Impaired loans, recorded investment with related allowance | 52,101 | 34,481 | 11,081 | |||||||||
| Impaired loans, related allowance | 3,435 | 2,558 | 762 | |||||||||
| Impaired loans, average recorded investment | 121,462 | 93,627 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial | Services [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 11,542 | 12,824 | 11,723 | |||||||||
| Impaired loans, recorded investment, total | 7,713 | 9,512 | 8,173 | |||||||||
| Impaired loans, recorded investment with no related allowance | 7,713 | 9,512 | 8,173 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 7,943 | 9,901 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial | Wholesale/retail [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 17,582 | 9,502 | 17,669 | |||||||||
| Impaired loans, recorded investment, total | 11,090 | 3,685 | 11,407 | |||||||||
| Impaired loans, recorded investment with no related allowance | 11,090 | 3,673 | 11,407 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 12 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 9 | 0 | |||||||||
| Impaired loans, average recorded investment | 11,248 | 3,302 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial | Manufacturing [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 6,377 | 658 | 5,320 | |||||||||
| Impaired loans, recorded investment, total | 5,907 | 312 | 4,931 | |||||||||
| Impaired loans, recorded investment with no related allowance | 5,907 | 312 | 4,931 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 5,419 | 322 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial | Healthcare [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 1,379 | 1,338 | 1,147 | |||||||||
| Impaired loans, recorded investment, total | 909 | 1,023 | 825 | |||||||||
| Impaired loans, recorded investment with no related allowance | 909 | 905 | 825 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 118 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 35 | 0 | |||||||||
| Impaired loans, average recorded investment | 867 | 1,048 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial | Other commercial and industrial [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 28,876 | 8,235 | 29,006 | |||||||||
| Impaired loans, recorded investment, total | 20,781 | 567 | 21,118 | |||||||||
| Impaired loans, recorded investment with no related allowance | 20,764 | 567 | 21,083 | |||||||||
| Impaired loans, recorded investment with related allowance | 17 | 0 | 35 | |||||||||
| Impaired loans, related allowance | 17 | 0 | 35 | |||||||||
| Impaired loans, average recorded investment | 20,950 | 595 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 7,453 | 20,080 | 14,427 | |||||||||
| Impaired loans, recorded investment, total | 4,475 | 9,270 | 5,521 | |||||||||
| Impaired loans, recorded investment with no related allowance | 4,475 | 9,114 | 5,521 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 156 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 18 | 0 | |||||||||
| Impaired loans, average recorded investment | 4,998 | 9,136 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | Residential construction and land development [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 4,126 | 7,621 | 4,951 | |||||||||
| Impaired loans, recorded investment, total | 2,616 | 4,789 | 3,433 | |||||||||
| Impaired loans, recorded investment with no related allowance | 2,616 | 4,789 | 3,433 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 3,024 | 4,599 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | Retail [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 523 | 1,923 | 530 | |||||||||
| Impaired loans, recorded investment, total | 314 | 1,302 | 326 | |||||||||
| Impaired loans, recorded investment with no related allowance | 314 | 1,302 | 326 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 320 | 1,311 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | Office [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 515 | 920 | 521 | |||||||||
| Impaired loans, recorded investment, total | 413 | 629 | 426 | |||||||||
| Impaired loans, recorded investment with no related allowance | 413 | 629 | 426 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 420 | 640 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | Multifamily [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 1,000 | 1,192 | 1,000 | |||||||||
| Impaired loans, recorded investment, total | 24 | 250 | 38 | |||||||||
| Impaired loans, recorded investment with no related allowance | 24 | 250 | 38 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 31 | 262 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | Industrial [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 76 | 76 | 76 | |||||||||
| Impaired loans, recorded investment, total | 76 | 76 | 76 | |||||||||
| Impaired loans, recorded investment with no related allowance | 76 | 76 | 76 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 76 | 76 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Commercial real estate | Other commercial real estate [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 1,213 | 8,348 | 7,349 | |||||||||
| Impaired loans, recorded investment, total | 1,032 | 2,224 | 1,222 | |||||||||
| Impaired loans, recorded investment with no related allowance | 1,032 | 2,068 | 1,222 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 156 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 18 | 0 | |||||||||
| Impaired loans, average recorded investment | 1,127 | 2,248 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Residential mortgage | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 252,600 | 249,866 | 247,005 | |||||||||
| Impaired loans, recorded investment, total | 240,154 | 235,377 | 233,761 | |||||||||
| Impaired loans, recorded investment with no related allowance | 240,109 | 235,263 | 233,715 | |||||||||
| Impaired loans, recorded investment with related allowance | 45 | 114 | 46 | |||||||||
| Impaired loans, related allowance | 45 | 66 | 46 | |||||||||
| Impaired loans, average recorded investment | 242,569 | 238,380 | ||||||||||
| Impaired loans, interest income recognized | 2,195 | 2,099 | ||||||||||
| Residential mortgage | Permanent mortgage [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 29,355 | 35,149 | 28,830 | |||||||||
| Impaired loans, recorded investment, total | 24,188 | 27,497 | 22,855 | |||||||||
| Impaired loans, recorded investment with no related allowance | 24,143 | 27,383 | 22,809 | |||||||||
| Impaired loans, recorded investment with related allowance | 45 | 114 | 46 | |||||||||
| Impaired loans, related allowance | 45 | 66 | 46 | |||||||||
| Impaired loans, average recorded investment | 23,521 | 28,240 | ||||||||||
| Impaired loans, interest income recognized | 291 | 327 | ||||||||||
| Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 210,237 | [1] | 203,396 | [2] | 205,564 | [3] | ||||||
| Impaired loans, recorded investment, total | 204,181 | [1] | 197,350 | [2] | 199,387 | [3] | ||||||
| Impaired loans, recorded investment with no related allowance | 204,181 | [1] | 197,350 | [2] | 199,387 | [3] | ||||||
| Impaired loans, recorded investment with related allowance | 0 | [1] | 0 | [2] | 0 | [3] | ||||||
| Impaired loans, related allowance | 0 | [1] | 0 | [2] | 0 | [3] | ||||||
| Impaired loans, average recorded investment | 207,396 | [1] | 199,697 | [2] | ||||||||
| Impaired loans, interest income recognized | 1,904 | [1] | 1,772 | [2] | ||||||||
| Residential mortgage | Home equity [Member] | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 13,008 | 11,321 | 12,611 | |||||||||
| Impaired loans, recorded investment, total | 11,785 | 10,530 | 11,519 | |||||||||
| Impaired loans, recorded investment with no related allowance | 11,785 | 10,530 | 11,519 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, average recorded investment | 11,652 | 10,443 | ||||||||||
| Impaired loans, interest income recognized | 0 | 0 | ||||||||||
| Personal | ||||||||||||
| Impaired loans [Abstract] | ||||||||||||
| Impaired loans, unpaid principal balance | 265 | 363 | 332 | |||||||||
| Impaired loans, recorded investment, total | 235 | 331 | 290 | |||||||||
| Impaired loans, recorded investment with no related allowance | 235 | 331 | 290 | |||||||||
| Impaired loans, recorded investment with related allowance | 0 | 0 | 0 | |||||||||
| Impaired loans, related allowance | 0 | 0 | $ 0 | |||||||||
| Impaired loans, average recorded investment | 262 | 397 | ||||||||||
| Impaired loans, interest income recognized | $ 0 | $ 0 | ||||||||||
| ||||||||||||
Loans and Allowances for Credit Losses, Troubled Debt Restructurings (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
|
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | $ 159,541 | $ 129,035 | $ 147,117 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 86,852 | 58,676 | 74,738 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 72,689 | 70,359 | 72,379 |
| Troubled Debt Restructuring, Specific allowance | 316 | 75 | 46 |
| Troubled Debt Restructuring, Charge-offs | 21 | 133 | |
| Nonaccrual [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 75,964 | 51,437 | 65,747 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 57,812 | 30,261 | 47,449 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 18,152 | 21,176 | 18,298 |
| Troubled Debt Restructuring, Specific allowance | 316 | 75 | 46 |
| Troubled Debt Restructuring, Charge-offs | 21 | 133 | |
| Nonaccrual [Member] | Commercial | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 47,993 | 15,782 | 36,879 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 40,799 | 11,631 | 29,225 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 7,194 | 4,151 | 7,654 |
| Troubled Debt Restructuring, Specific allowance | 271 | 9 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 57 | |
| Nonaccrual [Member] | Commercial | Energy [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 28,529 | 2,829 | 16,893 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 22,883 | 0 | 10,867 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 5,646 | 2,829 | 6,026 |
| Troubled Debt Restructuring, Specific allowance | 271 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Services [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 7,356 | 8,863 | 7,527 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 6,679 | 8,076 | 6,830 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 677 | 787 | 697 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Wholesale/retail [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 10,984 | 2,619 | 11,291 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 10,984 | 2,567 | 11,251 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 52 | 40 |
| Troubled Debt Restructuring, Specific allowance | 0 | 9 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Manufacturing [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 209 | 267 | 224 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 209 | 267 | 224 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 0 | 0 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Healthcare [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 601 | 656 | 607 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 0 | 656 | 0 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 601 | 0 | 607 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial | Other commercial and industrial [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 314 | 548 | 337 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 44 | 65 | 53 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 270 | 483 | 284 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 57 | |
| Nonaccrual [Member] | Commercial real estate | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 1,459 | 4,242 | 1,707 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 1,101 | 1,859 | 1,114 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 358 | 2,383 | 593 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Residential construction and land development [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 630 | 1,871 | 690 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 272 | 296 | 97 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 358 | 1,575 | 593 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Retail [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 314 | 1,302 | 326 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 314 | 925 | 326 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 377 | 0 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Office [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 138 | 160 | 143 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 138 | 160 | 143 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 0 | 0 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Multifamily [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 0 | 0 | 0 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 0 | 0 | 0 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 0 | 0 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Industrial [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 0 | 0 | 0 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 0 | 0 | 0 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 0 | 0 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Commercial real estate | Other commercial real estate [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 377 | 909 | 548 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 377 | 478 | 548 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 431 | 0 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Residential mortgage | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 26,309 | 31,129 | 26,924 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 15,709 | 16,509 | 16,874 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 10,600 | 14,620 | 10,050 |
| Troubled Debt Restructuring, Specific allowance | 45 | 66 | 46 |
| Troubled Debt Restructuring, Charge-offs | 20 | 69 | |
| Nonaccrual [Member] | Residential mortgage | Permanent mortgage [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 14,457 | 16,242 | 14,876 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 9,876 | 11,451 | 10,175 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 4,581 | 4,791 | 4,701 |
| Troubled Debt Restructuring, Specific allowance | 45 | 66 | 46 |
| Troubled Debt Restructuring, Charge-offs | 0 | 3 | |
| Nonaccrual [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 6,189 | 9,809 | 6,702 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 1,597 | 851 | 2,241 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 4,592 | 8,958 | 4,461 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 0 | 0 | |
| Nonaccrual [Member] | Residential mortgage | Home equity [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 5,663 | 5,078 | 5,346 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 4,236 | 4,207 | 4,458 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 1,427 | 871 | 888 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 20 | 66 | |
| Nonaccrual [Member] | Personal | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 203 | 284 | 237 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 203 | 262 | 236 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 0 | 22 | 1 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | 0 |
| Troubled Debt Restructuring, Charge-offs | 1 | 7 | |
| Accruing [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||
| Financing Receivable, Modifications [Line Items] | |||
| Troubled Debt Restructuring, Recorded Investment | 83,577 | 77,598 | 81,370 |
| Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 29,040 | 28,415 | 27,289 |
| Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms | 54,537 | 49,183 | 54,081 |
| Troubled Debt Restructuring, Specific allowance | 0 | 0 | $ 0 |
| Troubled Debt Restructuring, Charge-offs | $ 0 | $ 0 | |
Loans and Allowances for Credit Losses, Troubled Debt Restructurings, Modifications (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | $ 22,041 | $ 10,665 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 25,563 | 28,743 |
| Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,242 | 525 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 5,646 | 2,829 |
| Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,242 | 525 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 5,646 | 2,829 |
| Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 8,795 | 10,130 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 19,917 | 25,914 |
| Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 47 | 429 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 678 | 1,597 |
| Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 8,093 | 9,079 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 18,242 | 23,952 |
| Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 655 | 622 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 997 | 365 |
| Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 4 | 10 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 7,912 | 8,989 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 17,106 | 22,606 |
| Accruing [Member] | Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | |
| Accruing [Member] | Commercial | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | |
| Accruing [Member] | Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 7,912 | 8,989 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 17,106 | 22,606 |
| Accruing [Member] | Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 7,912 | 8,989 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 17,106 | 22,606 |
| Accruing [Member] | Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 5,885 | 4,331 |
| Accruing [Member] | Payment Stream [Member] | Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 5,885 | 4,331 |
| Accruing [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 5,885 | 4,331 |
| Accruing [Member] | Payment Stream [Member] | Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Payment Stream [Member] | Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 2,027 | 4,658 |
| Accruing [Member] | Combination & Other [Member] | Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 2,027 | 4,658 |
| Accruing [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 2,027 | 4,658 |
| Accruing [Member] | Combination & Other [Member] | Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Accruing [Member] | Combination & Other [Member] | Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 14,129 | 1,676 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 8,457 | 6,137 |
| Nonaccrual [Member] | Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,242 | 525 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 5,646 | 2,829 |
| Nonaccrual [Member] | Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,242 | 525 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 5,646 | 2,829 |
| Nonaccrual [Member] | Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 883 | 1,141 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 2,811 | 3,308 |
| Nonaccrual [Member] | Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 47 | 429 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 678 | 1,597 |
| Nonaccrual [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 181 | 90 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 1,136 | 1,346 |
| Nonaccrual [Member] | Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 655 | 622 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 997 | 365 |
| Nonaccrual [Member] | Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 4 | 10 |
| Troubled Debt Restructurings, Recorded Balance With Payment Default | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,382 | 892 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,242 | 525 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 13,242 | 525 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 140 | 367 |
| Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 16 | 367 |
| Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 124 | 0 |
| Nonaccrual [Member] | Payment Stream [Member] | Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 747 | 784 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | Energy [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | Services [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | Wholesale/retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | Manufacturing [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | Healthcare [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial | Other commercial and industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Residential construction and land development [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Retail [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Office [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Multifamily [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Industrial [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Commercial real estate | Other commercial real estate [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 0 | 0 |
| Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 743 | 774 |
| Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgage [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 31 | 62 |
| Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 181 | 90 |
| Nonaccrual [Member] | Combination & Other [Member] | Residential mortgage | Home equity [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | 531 | 622 |
| Nonaccrual [Member] | Combination & Other [Member] | Personal | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Troubled Debt Restructurings, Recorded Balance Modified During The Period | $ 4 | $ 10 |
Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|---|---|---|---|
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | $ 16,623,659 | $ 16,597,641 | $ 15,621,076 |
| Nonaccrual | 207,616 | 230,984 | 241,830 |
| Total | 16,991,906 | 16,989,660 | 16,022,566 |
| Commercial | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 10,166,025 | 10,205,838 | 10,098,325 |
| Nonaccrual | 156,825 | 178,953 | 174,652 |
| Total | 10,327,110 | 10,390,824 | 10,288,425 |
| Commercial | Energy [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 2,426,100 | 2,364,890 | 2,864,408 |
| Nonaccrual | 110,425 | 132,499 | 159,553 |
| Total | 2,537,112 | 2,497,868 | 3,029,420 |
| Commercial | Services [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 3,002,984 | 3,099,605 | 2,714,697 |
| Nonaccrual | 7,713 | 8,173 | 9,512 |
| Total | 3,013,375 | 3,108,990 | 2,728,891 |
| Commercial | Wholesale/retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 1,495,023 | 1,561,650 | 1,443,503 |
| Nonaccrual | 11,090 | 11,407 | 3,685 |
| Total | 1,506,243 | 1,576,818 | 1,451,846 |
| Commercial | Manufacturing [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 537,168 | 509,662 | 600,029 |
| Nonaccrual | 5,907 | 4,931 | 312 |
| Total | 543,430 | 514,975 | 600,645 |
| Commercial | Healthcare [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 2,264,266 | 2,201,050 | 1,994,402 |
| Nonaccrual | 909 | 825 | 1,023 |
| Total | 2,265,604 | 2,201,916 | 1,995,425 |
| Commercial | Other commercial and industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 440,484 | 468,981 | 481,286 |
| Nonaccrual | 20,781 | 21,118 | 567 |
| Total | 461,346 | 490,257 | 482,198 |
| Commercial real estate | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 3,866,234 | 3,803,519 | 3,355,981 |
| Nonaccrual | 4,475 | 5,521 | 9,270 |
| Total | 3,871,063 | 3,809,046 | 3,370,507 |
| Commercial real estate | Residential construction and land development [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 133,064 | 132,100 | 167,160 |
| Nonaccrual | 2,616 | 3,433 | 4,789 |
| Total | 135,994 | 135,533 | 171,949 |
| Commercial real estate | Retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 744,732 | 761,562 | 809,220 |
| Nonaccrual | 314 | 326 | 1,302 |
| Total | 745,046 | 761,888 | 810,522 |
| Commercial real estate | Office [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 860,476 | 798,462 | 694,923 |
| Nonaccrual | 413 | 426 | 629 |
| Total | 860,889 | 798,888 | 695,552 |
| Commercial real estate | Multifamily [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 922,952 | 903,234 | 728,183 |
| Nonaccrual | 24 | 38 | 250 |
| Total | 922,991 | 903,272 | 733,689 |
| Commercial real estate | Industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 871,362 | 871,673 | 564,391 |
| Nonaccrual | 76 | 76 | 76 |
| Total | 871,463 | 871,749 | 564,467 |
| Commercial real estate | Other commercial real estate [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 333,648 | 336,488 | 392,104 |
| Nonaccrual | 1,032 | 1,222 | 2,224 |
| Total | 334,680 | 337,716 | 394,328 |
| Residential mortgage | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 1,744,748 | 1,749,473 | 1,673,048 |
| Nonaccrual | 46,081 | 46,220 | 57,577 |
| Total | 1,946,274 | 1,949,832 | 1,869,309 |
| Residential mortgage | Permanent mortgage [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 948,191 | 979,386 | 918,965 |
| Nonaccrual | 24,188 | 22,855 | 27,497 |
| Total | 977,743 | 1,006,820 | 948,405 |
| Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 45,643 | 40,594 | 43,259 |
| Nonaccrual | 10,108 | 11,846 | 19,550 |
| Total | 204,181 | 199,387 | 197,350 |
| Residential mortgage | Home equity [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 750,914 | 729,493 | 710,824 |
| Nonaccrual | 11,785 | 11,519 | 10,530 |
| Total | 764,350 | 743,625 | 723,554 |
| Personal | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Current | 846,652 | 838,811 | 493,722 |
| Nonaccrual | 235 | 290 | 331 |
| Total | 847,459 | 839,958 | 494,325 |
| 30 to 59 Days [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 40,454 | 28,603 | 31,031 |
| 30 to 59 Days [Member] | Commercial | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 3,077 | 4,968 | 12,607 |
| 30 to 59 Days [Member] | Commercial | Energy [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 437 | 479 | 3,001 |
| 30 to 59 Days [Member] | Commercial | Services [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 2,395 | 191 | 4,682 |
| 30 to 59 Days [Member] | Commercial | Wholesale/retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 130 | 3,761 | 4,658 |
| 30 to 59 Days [Member] | Commercial | Manufacturing [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 115 | 382 | 0 |
| 30 to 59 Days [Member] | Commercial | Healthcare [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 30 to 59 Days [Member] | Commercial | Other commercial and industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 155 | 266 |
| 30 to 59 Days [Member] | Commercial real estate | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 354 | 6 | 0 |
| 30 to 59 Days [Member] | Commercial real estate | Residential construction and land development [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 314 | 0 | 0 |
| 30 to 59 Days [Member] | Commercial real estate | Retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 30 to 59 Days [Member] | Commercial real estate | Office [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 30 to 59 Days [Member] | Commercial real estate | Multifamily [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 15 | 0 | 0 |
| 30 to 59 Days [Member] | Commercial real estate | Industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 25 | 0 | 0 |
| 30 to 59 Days [Member] | Commercial real estate | Other commercial real estate [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 6 | 0 |
| 30 to 59 Days [Member] | Residential mortgage | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 36,593 | 23,040 | 18,158 |
| 30 to 59 Days [Member] | Residential mortgage | Permanent mortgage [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 5,364 | 3,299 | 1,378 |
| 30 to 59 Days [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 29,853 | 17,465 | 14,835 |
| 30 to 59 Days [Member] | Residential mortgage | Home equity [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 1,376 | 2,276 | 1,945 |
| 30 to 59 Days [Member] | Personal | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 430 | 589 | 266 |
| 60 to 89 Days [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 1,505 | 16,748 | 13,394 |
| 60 to 89 Days [Member] | Commercial | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 1,134 | 1,065 | 79 |
| 60 to 89 Days [Member] | Commercial | Energy [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 150 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial | Services [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 234 | 1,021 | 0 |
| 60 to 89 Days [Member] | Commercial | Wholesale/retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial | Manufacturing [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 240 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial | Healthcare [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 429 | 41 | 0 |
| 60 to 89 Days [Member] | Commercial | Other commercial and industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 81 | 3 | 79 |
| 60 to 89 Days [Member] | Commercial real estate | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial real estate | Residential construction and land development [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial real estate | Retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial real estate | Office [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial real estate | Multifamily [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial real estate | Industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Commercial real estate | Other commercial real estate [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 60 to 89 Days [Member] | Residential mortgage | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 266 | 15,420 | 13,310 |
| 60 to 89 Days [Member] | Residential mortgage | Permanent mortgage [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 1,280 | 565 |
| 60 to 89 Days [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 13,803 | 12,490 |
| 60 to 89 Days [Member] | Residential mortgage | Home equity [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 266 | 337 | 255 |
| 60 to 89 Days [Member] | Personal | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 105 | 263 | 5 |
| 90 Days or More [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 118,672 | 115,684 | 115,235 |
| 90 Days or More [Member] | Commercial | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 49 | 0 | 2,762 |
| 90 Days or More [Member] | Commercial | Energy [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 2,458 |
| 90 Days or More [Member] | Commercial | Services [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 49 | 0 | 0 |
| 90 Days or More [Member] | Commercial | Wholesale/retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial | Manufacturing [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 304 |
| 90 Days or More [Member] | Commercial | Healthcare [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial | Other commercial and industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial real estate | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 5,256 |
| 90 Days or More [Member] | Commercial real estate | Residential construction and land development [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial real estate | Retail [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial real estate | Office [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial real estate | Multifamily [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 5,256 |
| 90 Days or More [Member] | Commercial real estate | Industrial [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Commercial real estate | Other commercial real estate [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Residential mortgage | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 118,586 | 115,679 | 107,216 |
| 90 Days or More [Member] | Residential mortgage | Permanent mortgage [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 0 | 0 | 0 |
| 90 Days or More [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 118,577 | 115,679 | 107,216 |
| 90 Days or More [Member] | Residential mortgage | Home equity [Member] | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | 9 | 0 | 0 |
| 90 Days or More [Member] | Personal | |||
| Financing receivable, recorded investment, aging [Abstract] | |||
| Past Due | $ 37 | $ 5 | $ 1 |
Acquisitions (Details) - MBT Bancshares [Member] - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Dec. 01, 2016 |
Mar. 31, 2017 |
|
| Business Acquisition [Line Items] | ||
| Business Acquisition, Effective Date of Acquisition | Dec. 01, 2016 | |
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 102,500 | |
| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles | $ 2,000 | |
| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment | 1,500 | |
| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill | $ 526 |
Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
|
| Schedule of Residential Mortgage Loans Held For Sale [Line Items] | |||
| Number of days for past due for loan to be considered nonperforming (in days) | 90 days | 90 days | 90 days |
| Residential mortgage loans held for sale, nonperforming | $ 0 | $ 0 | $ 0 |
| Credit losses recognized on residential mortgage loans held for sale | 0 | 0 | 0 |
| Components of Residential Mortgage Loans Held for Sale [Abstract] | |||
| Unpaid principal balance | 237,811 | 309,040 | 286,414 |
| Residential mortgage loans held for sale, Fair value | 237,695 | 318,191 | 286,971 |
| Total residential mortgage loans held for sale and mortgage loan commitments, net of forward sales contracts | $ 248,707 | $ 332,040 | $ 301,897 |
| Not Designated as Hedging Instrument [Member] | Residential mortgage loan commitments [Member] | |||
| Schedule of Residential Mortgage Loans Held For Sale [Line Items] | |||
| General number of days outstanding for residential mortgage commitments, minimum (in days) | 60 days | 60 days | 60 days |
| General number of days outstanding for residential mortgage commitments, maximum (in days) | 90 days | 90 days | 90 days |
| Components of Residential Mortgage Loans Held for Sale [Abstract] | |||
| Notional | $ 381,732 | $ 902,986 | $ 318,359 |
| Derivative, Net fair value | $ 14,267 | $ 20,170 | $ 9,733 |
| Not Designated as Hedging Instrument [Member] | Forward sales contracts [Member] | |||
| Schedule of Residential Mortgage Loans Held For Sale [Line Items] | |||
| General number of days for delivery of loans, for which the price is set by forward sales contracts, minimum (in days) | 60 days | 60 days | 60 days |
| General number of days for delivery for loans, for which the price is set by forward sales contracts, maximum (in days) | 90 days | 90 days | 90 days |
| Components of Residential Mortgage Loans Held for Sale [Abstract] | |||
| Notional | $ 586,517 | $ 1,012,041 | $ 569,543 |
| Derivative, Net fair value | $ (3,255) | $ (6,321) | $ 5,193 |
Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Mortgage Banking Revenue [Abstract] | ||
| Net realized gains on sale of mortgage loans | $ 12,703 | $ 8,449 |
| Net change in unrealized gain on mortgage loans held for sale | (246) | 3,283 |
| Net change in the fair value of mortgage loan commitments | 4,534 | 12,036 |
| Net change in the fair value of forward sales contracts | (8,448) | (7,121) |
| Total production revenue | 8,543 | 16,647 |
| Servicing revenue | 16,648 | 15,453 |
| Total mortgage banking revenue | $ 25,191 | $ 32,100 |
Mortgage Banking Activities, Mortgage Servicing Rights (Details) |
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Mar. 31, 2016
USD ($)
|
|
| Summary of Mortgage Servicing Rights [Abstract] | |||
| Number of residential mortgage loans serviced for others | 138,778 | 139,340 | 134,040 |
| Outstanding principal balance of residential mortgage loans serviced for others | $ 22,015,021,000 | $ 21,997,568,000 | $ 20,294,662,000 |
| Weighted average interest rate | 3.96% | 3.97% | 4.10% |
| Remaining term (in months) | 300 months | 301 months | 300 months |
| Economic hedge threshold for interest rate sensitivity for mortgage servicing rights and securities held (in basis points) | 50 | ||
| Dollar decrease in fair value of mortgage servicing rights due to a 50 basis point decrease in mortgage interest rates | $ 30,000,000 | ||
| Dollar increase in fair value of mortgage servicing rights Due To 50 Basis Point Increase In Mortgage Interest Rates | 25,000,000 | ||
| Servicing Asset at Fair Value, Amount [Roll Forward] | |||
| Beginning balance | 247,073,000 | $ 218,605,000 | |
| Additions, net | 8,436,000 | 13,582,000 | |
| Change in fair value due to scheduled payments and full-balance payoffs | (7,962,000) | (8,144,000) | |
| Change in fair value due to market assumption changes | 1,856,000 | (27,988,000) | |
| Ending balance | $ 249,403,000 | $ 247,073,000 | $ 196,055,000 |
| Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] | |||
| Discount rate - risk-free rate plus a market premium (in hundredths) | 10.08% | 10.08% | 10.11% |
| Prepayment rate - based upon loan interest rate, original term and loan type, minimum | 8.66% | 8.98% | 8.88% |
| Prepayment rate - based upon loan interest rate, original term and loan type, maximum | 18.17% | 16.91% | 35.21% |
| Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan) | $ 63 | $ 63 | $ 63 |
| Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan) | 120 | 120 | 120 |
| Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan) | 150 | 150 | 150 |
| Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan) | 500 | 500 | 500 |
| Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan) | 650 | 650 | 650 |
| Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan) | $ 4,250 | $ 4,250 | $ 4,250 |
| Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths) | 2.06% | 1.98% | 1.19% |
| Primary secondary mortgage rate spread (in basis points) | 105 | 105 | 120 |
| Purchased [Member] | |||
| Servicing Asset at Fair Value, Amount [Roll Forward] | |||
| Beginning balance | $ 8,909,000 | $ 9,911,000 | |
| Additions, net | 0 | 0 | |
| Change in fair value due to scheduled payments and full-balance payoffs | (509,000) | (626,000) | |
| Change in fair value due to market assumption changes | (84,000) | (3,336,000) | |
| Ending balance | 8,316,000 | $ 8,909,000 | 5,949,000 |
| Originated [Member] | |||
| Servicing Asset at Fair Value, Amount [Roll Forward] | |||
| Beginning balance | 238,164,000 | 208,694,000 | |
| Additions, net | 8,436,000 | 13,582,000 | |
| Change in fair value due to scheduled payments and full-balance payoffs | (7,453,000) | (7,518,000) | |
| Change in fair value due to market assumption changes | 1,940,000 | (24,652,000) | |
| Ending balance | $ 241,087,000 | $ 238,164,000 | $ 190,106,000 |
Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details) $ in Thousands |
Mar. 31, 2017
USD ($)
|
|---|---|
| Financing Receivable, Recorded Investment, Aging [Abstract] | |
| Current | $ 21,633,630 |
| 30 to 59 Days Past Due | 252,813 |
| 60 to 89 Days Past Due | 65,674 |
| 90 Days or More Past Due | 62,904 |
| Total | 22,015,021 |
| Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | |
| Financing Receivable, Recorded Investment, Aging [Abstract] | |
| Current | 8,052,339 |
| 30 to 59 Days Past Due | 48,670 |
| 60 to 89 Days Past Due | 12,098 |
| 90 Days or More Past Due | 24,705 |
| Total | 8,137,812 |
| Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | |
| Financing Receivable, Recorded Investment, Aging [Abstract] | |
| Current | 6,848,773 |
| 30 to 59 Days Past Due | 43,151 |
| 60 to 89 Days Past Due | 9,914 |
| 90 Days or More Past Due | 20,839 |
| Total | 6,922,677 |
| Government National Mortgage Association Certificates and Obligations (GNMA) [Member] | |
| Financing Receivable, Recorded Investment, Aging [Abstract] | |
| Current | 6,253,924 |
| 30 to 59 Days Past Due | 156,821 |
| 60 to 89 Days Past Due | 43,016 |
| 90 Days or More Past Due | 15,492 |
| Total | 6,469,253 |
| Other Investor Loans [Member] | |
| Financing Receivable, Recorded Investment, Aging [Abstract] | |
| Current | 478,594 |
| 30 to 59 Days Past Due | 4,171 |
| 60 to 89 Days Past Due | 646 |
| 90 Days or More Past Due | 1,868 |
| Total | $ 485,279 |
Mortgage Banking Activities, Loans Sold With Recourse (Details) $ in Thousands |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2017
USD ($)
|
Mar. 31, 2016
USD ($)
|
|
| Residential Mortgage Loan Repurchase and Servicing Losses [Abstract] | ||
| Number of mortgages purchased under repurchase agreement with government sponsored entities. | 5 | |
| Purchase price of loans purchased under repurchase agreement with government sponsored entities | $ 598 | |
| Number of loans sold under standard representations and warranties indemnified | 3 | |
| Number of unresolved deficiency requests | 185 | 220 |
| Aggregate outstanding principal balance subject to unresolved deficiency requests | $ 9,622 | $ 20,292 |
| Unpaid principal balance subject to indemnification by the Company | 5,249 | 4,668 |
| Activity in accrual for mortgage losses [Rollforward] | ||
| Beginning balance | 2,788 | 3,359 |
| Provision for losses | (199) | (118) |
| Charge-offs, net | (2) | (267) |
| Ending balance | $ 2,587 | $ 2,974 |
Commitments and Contingent Liabilities (Details) |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2017
USD ($)
shares
|
Dec. 31, 2016
USD ($)
|
|
| Visa Membership [Member] | ||
| Loss Contingencies [Line Items] | ||
| Number of Visa Class B Shares Owned by Entity (in shares) | shares | 252,233 | |
| Number of Visa Class A Shares Visa Class B Shares Are Convertible To (in shares) | shares | 415,755 | |
| BOKF Equity, LLC [Member] | ||
| Litigation Settlement [Abstract] | ||
| Number of Private Equity Funds of which the Entity is a General Partner | 2 | |
| Contingent Obligations For Additional Investments in Private Equity Funds | $ 4,000,000 | |
| Cavanal Hill Funds [Member] | ||
| Litigation Settlement [Abstract] | ||
| The Net Asset Value of Units in Mutual Funds (per unit) | 1.00 | |
| Settled Litigation [Member] | Deposit Account Posting Class Action [Member] | ||
| Litigation Settlement [Abstract] | ||
| Litigation Settlement, Amount | $ 7,800,000 | |
| Settled Litigation [Member] | Municipal Bond Purchase by Elected Treasurer [Member] | ||
| Litigation Settlement [Abstract] | ||
| Litigation Settlement, Amount | 125,000 | |
| Judicial Ruling [Member] | Misuse of Revenues Pledged to Municipal Bonds [Member] | ||
| Litigation Settlement [Abstract] | ||
| Litigation Settlement, Amount | 600,000 | |
| Outstanding principal, accrued interest and other amounts required by bond documents | 73,000,000 | |
| Disgorged fees | $ 1,067,721 | |
| Pending Litigation [Member] | Misuse of Revenues Pledged to Municipal Bonds [Member] | ||
| Litigation Settlement [Abstract] | ||
| Loss Contingency, Number of Plaintiffs | 2 | |
| Pending Litigation [Member] | Bank Participation in Fraudulent Sale of Securities by Principals [Member] | ||
| Litigation Settlement [Abstract] | ||
| Loss Contingency, Number of Plaintiffs | 19 | |
| Pending Litigation [Member] | Purchase of facilities from principals subject to SEC New Jersey proceedings [Member] | ||
| Litigation Settlement [Abstract] | ||
| Outstanding principal, accrued interest and other amounts required by bond documents | $ 60,000,000 | |
| Number of principals in SEC New Jersey proceedings | 2 | |
| Number of individuals who purchased facilities from the principals subject to SEC New Jersey proceedings | 2 | |
| Pending Litigation [Member] | Municipal Bond Purchase by Elected Treasurer [Member] | ||
| Litigation Settlement [Abstract] | ||
| Loss Contingency, Damages Sought, Value | $ 5,600,000 | |
| Pending Litigation [Member] | Ownership of deposit accounts [Member] | ||
| Litigation Settlement [Abstract] | ||
| Loss Contingency, Damages Sought, Value | $ 7,000,000 | |
| Loss Contingency, Number of Plaintiffs | 2 | |
| Amount paid by the bank from creditor accounts to judgment creditor | $ 4,200,000 |
Commitments and Contingent Liabilities Variable Interest Entities (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
|---|---|---|---|
| Loans Receivable [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | $ 10,000 | $ 10,000 | $ 10,000 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 53,000 | 44,488 | 32,679 |
| Loans Receivable [Member] | Private equity funds [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Loans Receivable [Member] | Tax credit entities [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 10,000 | 10,000 | 10,000 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 53,000 | 44,488 | 32,679 |
| Loans Receivable [Member] | Other [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Other Assets [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 45,721 | 58,725 | 70,409 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 170,842 | 175,390 | 120,803 |
| Other Assets [Member] | Private equity funds [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 17,816 | 17,357 | 22,120 |
| Other Assets [Member] | Tax credit entities [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 11,430 | 11,585 | 12,051 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 141,231 | 143,715 | 105,505 |
| Other Assets [Member] | Other [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 16,475 | 29,783 | 36,238 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 29,611 | 31,675 | 15,298 |
| Other Liabilities [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 1,408 | 3,189 | 2,663 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 73,694 | 78,357 | 39,394 |
| Other Liabilities [Member] | Private equity funds [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Other Liabilities [Member] | Tax credit entities [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 59,649 | 63,329 | 33,091 |
| Other Liabilities [Member] | Other [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 1,408 | 3,189 | 2,663 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 14,045 | 15,028 | 6,303 |
| Other borrowings [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 11,811 | 12,056 | 13,702 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Other borrowings [Member] | Private equity funds [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Other borrowings [Member] | Tax credit entities [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 10,964 | 10,964 | 10,964 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Other borrowings [Member] | Other [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 847 | 1,092 | 2,738 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Non-Controlling Interests [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 29,150 | 31,503 | 34,710 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Non-Controlling Interests [Member] | Private equity funds [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 14,119 | 13,237 | 17,166 |
| Non-Controlling Interests [Member] | Tax credit entities [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 10,000 | 10,000 | 10,000 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 0 |
| Non-Controlling Interests [Member] | Other [Member] | |||
| Variable Interest Entity [Line Items] | |||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 5,031 | 8,266 | 7,544 |
| Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | $ 0 | $ 0 | $ 0 |
Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
Apr. 25, 2017 |
Mar. 31, 2017 |
Mar. 31, 2016 |
||||
| Dividends declared (in dollars per share) | $ 0.44 | $ 0.43 | ||||
| Schedule of Accumulated Other Income (Loss) [Abstract] | ||||||
| Balance, Beginning of Period | $ (10,967) | $ 21,587 | ||||
| Net change in unrealized gain (loss) | 11,411 | 121,091 | ||||
| Reclassification adjustments included in earnings: | ||||||
| Interest revenue, Investment securities, Taxable securities | 0 | (69) | ||||
| Gain on available for sale securities, net | (2,049) | (3,964) | ||||
| Other comprehensive income (loss), before income taxes | 9,362 | 117,058 | ||||
| Federal and state income taxes | [1] | 3,616 | 45,536 | |||
| Other comprehensive income (loss), net of income taxes | 5,746 | 71,522 | ||||
| Balance, End of Period | (5,221) | 93,109 | ||||
| Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member] | ||||||
| Schedule of Accumulated Other Income (Loss) [Abstract] | ||||||
| Balance, Beginning of Period | (9,087) | 23,284 | ||||
| Net change in unrealized gain (loss) | 11,411 | 121,091 | ||||
| Reclassification adjustments included in earnings: | ||||||
| Interest revenue, Investment securities, Taxable securities | 0 | 0 | ||||
| Gain on available for sale securities, net | (2,049) | (3,964) | ||||
| Other comprehensive income (loss), before income taxes | 9,362 | 117,127 | ||||
| Federal and state income taxes | [1] | 3,616 | 45,563 | |||
| Other comprehensive income (loss), net of income taxes | 5,746 | 71,564 | ||||
| Balance, End of Period | (3,341) | 94,848 | ||||
| Accumulated Unrealized Gain on Investment Securities Transferred from AFS [Member] | ||||||
| Schedule of Accumulated Other Income (Loss) [Abstract] | ||||||
| Balance, Beginning of Period | 0 | 68 | ||||
| Net change in unrealized gain (loss) | 0 | 0 | ||||
| Reclassification adjustments included in earnings: | ||||||
| Interest revenue, Investment securities, Taxable securities | (69) | |||||
| Gain on available for sale securities, net | 0 | 0 | ||||
| Other comprehensive income (loss), before income taxes | 0 | (69) | ||||
| Federal and state income taxes | [1] | (27) | ||||
| Other comprehensive income (loss), net of income taxes | 0 | (42) | ||||
| Balance, End of Period | 0 | 26 | ||||
| Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member] | ||||||
| Schedule of Accumulated Other Income (Loss) [Abstract] | ||||||
| Balance, Beginning of Period | (1,880) | (1,765) | ||||
| Net change in unrealized gain (loss) | 0 | 0 | ||||
| Reclassification adjustments included in earnings: | ||||||
| Interest revenue, Investment securities, Taxable securities | 0 | 0 | ||||
| Gain on available for sale securities, net | 0 | 0 | ||||
| Other comprehensive income (loss), before income taxes | 0 | 0 | ||||
| Federal and state income taxes | [1] | 0 | 0 | |||
| Other comprehensive income (loss), net of income taxes | 0 | 0 | ||||
| Balance, End of Period | (1,880) | $ (1,765) | ||||
| Subsequent Event [Member] | ||||||
| Dividends Payable, Date Declared | Apr. 25, 2017 | |||||
| Dividends declared (in dollars per share) | $ 0.44 | |||||
| Dividends Payable, Date to be Paid | May 26, 2017 | |||||
| Dividends Payable, Date of Record | May 12, 2017 | |||||
| Perpetual Preferred, Equity Securities and Mutual Funds [Member] | Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member] | ||||||
| Reclassification adjustments included in earnings: | ||||||
| Balance, End of Period | $ 3,100 | |||||
| ||||||
Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Numerator: [Abstract] | ||
| Net income attributable to BOK Financial Corp. shareholders | $ 88,356 | $ 42,564 |
| Less: Earnings allocated to participating securities | 1,003 | 538 |
| Numerator for basic earnings per share – income available to common shareholders | 87,353 | 42,026 |
| Effect of reallocating undistributed earnings of participating securities | 0 | 0 |
| Numerator for diluted earnings per share – income available to common shareholders | $ 87,353 | $ 42,026 |
| Denominator: [Abstract] | ||
| Weighted average shares outstanding (in shares) | 65,457,772 | 66,131,166 |
| Less: Participating securities included in weighted average shares (in shares) | 741,808 | 834,625 |
| Denominator for basic earnings per common share (in shares) | 64,715,964 | 65,296,541 |
| Dilutive effect of employee stock compensation plans (in shares) | 67,773 | 34,887 |
| Denominator for diluted earnings per common share (in shares) | 64,783,737 | 65,331,428 |
| Basic earnings per share (per share) | $ 1.35 | $ 0.64 |
| Diluted earnings per share (per share) | $ 1.35 | $ 0.64 |
| Excludes employee stock options with exercise prices greater than current market price. | 0 | 244,019 |
Reportable Segments (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Segment Reporting Information [Line Items] | ||
| Net interest revenue from external sources | $ 201,182 | $ 182,572 |
| Net interest revenue (expense) from internal sources | 0 | 0 |
| Net interest revenue | 201,182 | 182,572 |
| Provision for credit losses | 0 | 35,000 |
| Net interest revenue after provision for credit losses | 201,182 | 147,572 |
| Other operating revenue | 170,296 | 157,414 |
| Other operating expense | 244,711 | 242,570 |
| Net direct contribution | 126,767 | 62,416 |
| Gain (loss) on financial instruments, net | 0 | 0 |
| Change in fair value of mortgage servicing rights | 0 | 0 |
| Gain (loss) on repossessed assets, net | 0 | 0 |
| Corporate expense allocations | 0 | 0 |
| Net income before taxes | 126,767 | 62,416 |
| Federal and state income taxes | 38,103 | 21,428 |
| Net income | 88,664 | 40,988 |
| Net income (loss) attributable to non-controlling interests | 308 | (1,576) |
| Net income attributable to BOK Financial Corp. shareholders | 88,356 | 42,564 |
| Average assets | 32,954,989 | 31,508,471 |
| Operating Segments [Member] | Commercial [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Net interest revenue from external sources | 134,704 | 116,637 |
| Net interest revenue (expense) from internal sources | (16,793) | (14,632) |
| Net interest revenue | 117,911 | 102,005 |
| Provision for credit losses | (1,462) | 21,572 |
| Net interest revenue after provision for credit losses | 119,373 | 80,433 |
| Other operating revenue | 46,270 | 45,108 |
| Other operating expense | 52,436 | 56,070 |
| Net direct contribution | 113,207 | 69,471 |
| Gain (loss) on financial instruments, net | 38 | 0 |
| Change in fair value of mortgage servicing rights | 0 | 0 |
| Gain (loss) on repossessed assets, net | (5) | (82) |
| Corporate expense allocations | 8,631 | 8,744 |
| Net income before taxes | 104,609 | 60,645 |
| Federal and state income taxes | 40,693 | 23,591 |
| Net income | 63,916 | 37,054 |
| Net income (loss) attributable to non-controlling interests | 0 | 0 |
| Net income attributable to BOK Financial Corp. shareholders | 63,916 | 37,054 |
| Average assets | 17,438,776 | 16,969,015 |
| Operating Segments [Member] | Consumer [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Net interest revenue from external sources | 21,129 | 21,449 |
| Net interest revenue (expense) from internal sources | 10,952 | 9,353 |
| Net interest revenue | 32,081 | 30,802 |
| Provision for credit losses | 1,272 | 1,702 |
| Net interest revenue after provision for credit losses | 30,809 | 29,100 |
| Other operating revenue | 47,306 | 54,029 |
| Other operating expense | 53,532 | 55,718 |
| Net direct contribution | 24,583 | 27,411 |
| Gain (loss) on financial instruments, net | (1,667) | 16,581 |
| Change in fair value of mortgage servicing rights | 1,856 | (27,988) |
| Gain (loss) on repossessed assets, net | (136) | 153 |
| Corporate expense allocations | 16,868 | 15,978 |
| Net income before taxes | 7,768 | 179 |
| Federal and state income taxes | 3,022 | 70 |
| Net income | 4,746 | 109 |
| Net income (loss) attributable to non-controlling interests | 0 | 0 |
| Net income attributable to BOK Financial Corp. shareholders | 4,746 | 109 |
| Average assets | 8,648,562 | 8,687,289 |
| Operating Segments [Member] | Wealth Management [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Net interest revenue from external sources | 11,485 | 6,078 |
| Net interest revenue (expense) from internal sources | 8,856 | 7,663 |
| Net interest revenue | 20,341 | 13,741 |
| Provision for credit losses | 40 | (150) |
| Net interest revenue after provision for credit losses | 20,301 | 13,891 |
| Other operating revenue | 74,158 | 68,747 |
| Other operating expense | 60,410 | 60,684 |
| Net direct contribution | 34,049 | 21,954 |
| Gain (loss) on financial instruments, net | 0 | 0 |
| Change in fair value of mortgage servicing rights | 0 | 0 |
| Gain (loss) on repossessed assets, net | 0 | 0 |
| Corporate expense allocations | 10,672 | 10,535 |
| Net income before taxes | 23,377 | 11,419 |
| Federal and state income taxes | 9,094 | 4,442 |
| Net income | 14,283 | 6,977 |
| Net income (loss) attributable to non-controlling interests | 0 | 0 |
| Net income attributable to BOK Financial Corp. shareholders | 14,283 | 6,977 |
| Average assets | 7,160,849 | 5,565,047 |
| Corporate, Non-Segment [Member] | Funds Management and Other [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Net interest revenue from external sources | 33,864 | 38,408 |
| Net interest revenue (expense) from internal sources | (3,015) | (2,384) |
| Net interest revenue | 30,849 | 36,024 |
| Provision for credit losses | 150 | 11,876 |
| Net interest revenue after provision for credit losses | 30,699 | 24,148 |
| Other operating revenue | 2,562 | (10,470) |
| Other operating expense | 78,333 | 70,098 |
| Net direct contribution | (45,072) | (56,420) |
| Gain (loss) on financial instruments, net | 1,629 | (16,581) |
| Change in fair value of mortgage servicing rights | (1,856) | 27,988 |
| Gain (loss) on repossessed assets, net | 141 | (71) |
| Corporate expense allocations | (36,171) | (35,257) |
| Net income before taxes | (8,987) | (9,827) |
| Federal and state income taxes | (14,706) | (6,675) |
| Net income | 5,719 | (3,152) |
| Net income (loss) attributable to non-controlling interests | 308 | (1,576) |
| Net income attributable to BOK Financial Corp. shareholders | 5,411 | (1,576) |
| Average assets | $ (293,198) | $ 287,120 |
Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | $ 677,156 | $ 337,628 | $ 279,539 | ||||||||||||||||
| Available for sale securities | 8,437,291 | 8,676,829 | 8,886,036 | ||||||||||||||||
| Fair value option securities | 441,714 | 77,046 | 418,887 | ||||||||||||||||
| Mortgage servicing rights | 249,403 | 247,073 | 196,055 | $ 218,605 | |||||||||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 304,727 | 689,872 | 790,146 | ||||||||||||||||
| Liabilities: [Abstract] | |||||||||||||||||||
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 276,422 | 664,531 | 705,578 | ||||||||||||||||
| U.S. government agency debentures | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 18,365 | 6,234 | 59,733 | ||||||||||||||||
| U.S. government agency residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 578,977 | 310,067 | 146,896 | ||||||||||||||||
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | ||||||||||||||||
| Fair value option securities | 441,714 | 77,046 | 418,887 | ||||||||||||||||
| Municipal and other tax-exempt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 45,114 | 14,427 | 58,797 | ||||||||||||||||
| Available for sale securities | 35,453 | 40,993 | 51,308 | ||||||||||||||||
| Other trading securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 34,700 | 6,900 | 14,113 | ||||||||||||||||
| U.S. Treasury | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 999 | 999 | 1,003 | ||||||||||||||||
| Privately issued residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | ||||||||||||||||
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | ||||||||||||||||
| Other debt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 4,153 | 4,152 | 4,151 | ||||||||||||||||
| Perpetual preferred stock | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | ||||||||||||||||
| Equity securities and mutual funds | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 18,844 | 18,357 | 18,040 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 677,156 | 337,628 | 279,539 | ||||||||||||||||
| Available for sale securities | 8,437,291 | 8,676,829 | 8,886,036 | ||||||||||||||||
| Residential mortgage loans held for sale | 248,707 | 301,897 | 332,040 | ||||||||||||||||
| Mortgage servicing rights | 249,403 | [1] | 247,073 | [2] | 196,055 | [3] | |||||||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 304,727 | [4] | 689,872 | [5] | 790,146 | [6] | |||||||||||||
| Liabilities: [Abstract] | |||||||||||||||||||
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 276,422 | [4] | 664,531 | [5] | 705,578 | [6] | |||||||||||||
| Fair Value, Measurements, Recurring [Member] | U.S. government agency debentures | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 18,365 | 6,234 | 59,733 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | U.S. government agency residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 578,977 | 310,067 | 146,896 | ||||||||||||||||
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | ||||||||||||||||
| Fair value option securities | 441,714 | 77,046 | 418,887 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Municipal and other tax-exempt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 45,114 | 14,427 | 58,797 | ||||||||||||||||
| Available for sale securities | 35,453 | 40,993 | 51,308 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Other trading securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 34,700 | 6,900 | 14,113 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | U.S. Treasury | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 999 | 999 | 1,003 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Privately issued residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Other debt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 4,153 | 4,152 | 4,151 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Perpetual preferred stock | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Equity securities and mutual funds | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 18,844 | 18,357 | 18,040 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Available for sale securities | 4,905 | 4,494 | 4,219 | ||||||||||||||||
| Residential mortgage loans held for sale | 0 | 0 | 0 | ||||||||||||||||
| Mortgage servicing rights | 0 | [1] | 0 | [2] | 0 | [3] | |||||||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 12,631 | [4] | 7,541 | [5] | 29,533 | [6] | |||||||||||||
| Liabilities: [Abstract] | |||||||||||||||||||
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 15,455 | [4] | 6,972 | [5] | 3,084 | [6] | |||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government agency debentures | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government agency residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair value option securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal and other tax-exempt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other trading securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 999 | 999 | 1,003 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Privately issued residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Perpetual preferred stock | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity securities and mutual funds | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 3,906 | 3,495 | 3,216 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 677,156 | 337,628 | 279,539 | ||||||||||||||||
| Available for sale securities | 8,422,511 | 8,662,394 | 8,868,052 | ||||||||||||||||
| Residential mortgage loans held for sale | 236,028 | 290,280 | 323,941 | ||||||||||||||||
| Mortgage servicing rights | 0 | [1] | 0 | [2] | 0 | [3] | |||||||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 292,096 | [4] | 682,331 | [5] | 760,613 | [6] | |||||||||||||
| Liabilities: [Abstract] | |||||||||||||||||||
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 260,967 | [4] | 657,559 | [5] | 702,494 | [6] | |||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agency debentures | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 18,365 | 6,234 | 59,733 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agency residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 578,977 | 310,067 | 146,896 | ||||||||||||||||
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | ||||||||||||||||
| Fair value option securities | 441,714 | 77,046 | 418,887 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal and other tax-exempt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 45,114 | 14,427 | 58,797 | ||||||||||||||||
| Available for sale securities | 29,731 | 35,204 | 41,694 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 34,700 | 6,900 | 14,113 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Privately issued residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Perpetual preferred stock | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity securities and mutual funds | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 14,938 | 14,862 | 14,824 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Available for sale securities | 9,875 | 9,941 | 13,765 | ||||||||||||||||
| Residential mortgage loans held for sale | 12,679 | 11,617 | 8,099 | ||||||||||||||||
| Mortgage servicing rights | 249,403 | [1] | 247,073 | [2] | 196,055 | [3] | |||||||||||||
| Derviative contracts, net of cash collateral, Assets, Fair value | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||
| Liabilities: [Abstract] | |||||||||||||||||||
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 0 | [4] | 0 | [5] | 0 | [6] | |||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government agency debentures | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government agency residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair value option securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal and other tax-exempt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Available for sale securities | 5,722 | 5,789 | 9,614 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Trading securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Treasury | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Privately issued residential mortgage-backed securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 4,153 | 4,152 | 4,151 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Perpetual preferred stock | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | 0 | 0 | 0 | ||||||||||||||||
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity securities and mutual funds | |||||||||||||||||||
| Assets: [Abstract] | |||||||||||||||||||
| Available for sale securities | $ 0 | $ 0 | $ 0 | ||||||||||||||||
| |||||||||||||||||||
Fair Value Measurements, Measured On Recurring Basis Significant Unobservable Inputs (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands |
3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|||||||
| Available-for-sale securities [Member] | Municipal and other tax-exempt securities | ||||||||
| Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] | ||||||||
| Balance, beginning of period | $ 5,789 | $ 9,610 | ||||||
| Transfer to Level 3 from Level 2 | 0 | [1] | 0 | [2] | ||||
| Purchases | 0 | 0 | ||||||
| Proceeds from sales | 0 | 0 | ||||||
| Redemptions and distributions | 0 | 0 | ||||||
| Other comprehensive income (loss) | (67) | 4 | ||||||
| Balance, end of period | 5,722 | 9,614 | ||||||
| Available-for-sale securities [Member] | Municipal and other tax-exempt securities | Mortgage banking revenue [Member] | ||||||||
| Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] | ||||||||
| Gain (loss) recognized in earnings | 0 | 0 | ||||||
| Available-for-sale securities [Member] | Other debt securities | ||||||||
| Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] | ||||||||
| Balance, beginning of period | 4,152 | 4,151 | ||||||
| Transfer to Level 3 from Level 2 | 0 | [1] | 0 | [2] | ||||
| Purchases | 0 | 0 | ||||||
| Proceeds from sales | 0 | 0 | ||||||
| Redemptions and distributions | 0 | 0 | ||||||
| Other comprehensive income (loss) | 1 | 0 | ||||||
| Balance, end of period | 4,153 | 4,151 | ||||||
| Available-for-sale securities [Member] | Other debt securities | Mortgage banking revenue [Member] | ||||||||
| Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] | ||||||||
| Gain (loss) recognized in earnings | 0 | 0 | ||||||
| Residential mortgage loans held for sale [Member] | ||||||||
| Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] | ||||||||
| Balance, beginning of period | 11,617 | 7,874 | ||||||
| Transfer to Level 3 from Level 2 | 1,887 | [1] | 460 | [2] | ||||
| Purchases | 0 | 0 | ||||||
| Proceeds from sales | (589) | (113) | ||||||
| Redemptions and distributions | 0 | 0 | ||||||
| Other comprehensive income (loss) | 0 | 0 | ||||||
| Balance, end of period | 12,679 | 8,099 | ||||||
| Residential mortgage loans held for sale [Member] | Mortgage banking revenue [Member] | ||||||||
| Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] | ||||||||
| Gain (loss) recognized in earnings | $ (236) | $ (122) | ||||||
| ||||||||
Fair Value Measurements Fair Value Measurements, Financial Instruments Measured On a Recurring Basis, Quantitative Information (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
||||||||||||||||||||||||||||
| Available-for-sale securities [Member] | Municipal and other tax-exempt securities | ||||||||||||||||||||||||||||||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||||||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Par Value | $ 6,195 | $ 10,370 | $ 6,195 | |||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Amortized Cost | 6,163 | 10,311 | 6,163 | |||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Fair Value | $ 5,722 | $ 9,614 | $ 5,789 | |||||||||||||||||||||||||||
| Fair Value Measurements, Valuation Techniques | Discounted cash flows | [1] | Discounted cash flows | [2] | Discounted cash flows | [3] | ||||||||||||||||||||||||
| Fair Value Measurements, Significant Unobservable Input | Interest rate spread | Interest rate spread | Interest rate spread | |||||||||||||||||||||||||||
| Fair Value Inputs, Assets, Discount Rate, Minimum | 7.64% | [4] | 5.40% | [5] | 5.91% | [6] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Discount Rate, Maximum | 7.94% | [4] | 5.70% | [5] | 6.21% | [6] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Discount Rate, Weighted Average | 7.89% | [4] | 5.66% | [5] | 6.16% | [6] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum | 90.00% | [7] | 90.00% | [8] | 90.00% | [9] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum | 91.22% | [7] | 93.20% | [8] | 93.40% | [9] | ||||||||||||||||||||||||
| Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average | 90.75% | [7] | 92.72% | [8] | 92.20% | [9] | ||||||||||||||||||||||||
| Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum | 632 | 480 | 467 | |||||||||||||||||||||||||||
| Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum | 685 | 519 | 525 | |||||||||||||||||||||||||||
| Available-for-sale securities [Member] | Other debt securities | ||||||||||||||||||||||||||||||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||||||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Par Value | $ 4,400 | $ 4,400 | $ 4,400 | |||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Amortized Cost | 4,400 | 4,400 | 4,400 | |||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Fair Value | $ 4,153 | $ 4,151 | $ 4,152 | |||||||||||||||||||||||||||
| Fair Value Measurements, Valuation Techniques | Discounted cash flows | [1] | Discounted cash flows | [2] | Discounted cash flows | [3] | ||||||||||||||||||||||||
| Fair Value Measurements, Significant Unobservable Input | Interest rate spread | Interest rate spread | Interest rate spread | |||||||||||||||||||||||||||
| Fair Value Inputs, Assets, Discount Rate, Minimum | 6.00% | [10] | 5.51% | [11] | 6.01% | [12] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Discount Rate, Maximum | 6.84% | [10] | 5.93% | [11] | 6.26% | [12] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Discount Rate, Weighted Average | 6.75% | [10] | 5.88% | [11] | 6.23% | [12] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum | 94.34% | [7] | 94.32% | [8] | 94.34% | [9] | ||||||||||||||||||||||||
| Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum | 94.39% | [7] | 94.34% | [8] | 94.36% | [9] | ||||||||||||||||||||||||
| Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average | 94.38% | [7] | 94.34% | [8] | 94.36% | [9] | ||||||||||||||||||||||||
| Average Yields On Comparable Short-term Taxable Securities Maximum | 3.00% | 1.00% | 1.00% | |||||||||||||||||||||||||||
| Residential mortgage loans held for sale [Member] | ||||||||||||||||||||||||||||||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||||||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Amortized Cost | $ 13,623 | $ 8,742 | $ 12,431 | |||||||||||||||||||||||||||
| Fair Value Inputs, Asset, Fair Value | $ 12,679 | $ 8,099 | $ 11,617 | |||||||||||||||||||||||||||
| Fair Value Measurements, Valuation Techniques | Quoted prices of loans sold in securitization transactions, with a liquidity discount applied | Quoted prices of loans sold in securitization transactions, with a liquidity discount applied | Quoted prices of loans sold in securitization transactions, with a liquidity discount applied | |||||||||||||||||||||||||||
| Fair Value Measurements, Significant Unobservable Input | Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies. | Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies. | Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies. | |||||||||||||||||||||||||||
| Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies | 93.07% | 92.64% | 93.45% | |||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||
Fair Value Measurements, Fair Value Measured On a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Impaired Loans [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Gross charge-offs against allowance for loan losses | $ 444 | $ 22,157 |
| Net losses and expenses of repossessed assets, net | 0 | 0 |
| Real estate and other repossessed assets [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Gross charge-offs against allowance for loan losses | 0 | 0 |
| Net losses and expenses of repossessed assets, net | 293 | 458 |
| Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Carrying Value | 0 | 0 |
| Fair Value, Inputs, Level 1 [Member] | Real estate and other repossessed assets [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Carrying Value | 0 | 0 |
| Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Carrying Value | 462 | 604 |
| Fair Value, Inputs, Level 2 [Member] | Real estate and other repossessed assets [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Carrying Value | 777 | 3,577 |
| Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Carrying Value | 1,614 | 32,836 |
| Fair Value, Inputs, Level 3 [Member] | Real estate and other repossessed assets [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Carrying Value | $ 418 | $ 0 |
Fair Value Measurements Fair Value Measurement, Measured On Non-Recurring Basis, Signfiicant Unobservable Inputs, Quantitative Information (Details) - Fair Value, Measurements, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands |
3 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
||||||
| Impaired Loans [Member] | |||||||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |||||||
| Carrying Value | $ 1,614 | $ 32,836 | |||||
| Fair Value Measurements, Valuation Techniques | Discounted cash flows | Discounted cash flows | |||||
| Fair Value Measurements, Significant Unobservable Input | Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs | Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs | |||||
| Fair Value of Impaired Loans as a Percentage of Unpaid Principal Balance [Abstract] | |||||||
| Fair Value Measurements, Fair Value of Impaired Loans as a Percentage of Unpaid Principal Balance, Minimum | [1] | 76.00% | 55.00% | ||||
| Fair Value Measurements, Fair Value of Impaired Loans as a Percentage of Unpaid Principal Balance, Maximum | [1] | 81.00% | 73.00% | ||||
| Fair Value of Impaired Loans as a Percentage of Unpaid Principal Balance, Weighted Average | [1] | 77.00% | 60.00% | ||||
| Real estate and other repossessed assets [Member] | |||||||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |||||||
| Carrying Value | $ 418 | $ 0 | |||||
| Fair Value Measurements, Valuation Techniques | Appraised value, as adjusted | ||||||
| Fair Value Measurements, Significant Unobservable Input | [2] | Marketability adjustment off appraised value2 | |||||
| Fair Value of Real Estate and Other Repossessed Assets as a Percentage of Appraised Value [Abstract] | |||||||
| Fair Value Measurement, Percentage of Appraised Value. Minimum | 65.00% | ||||||
| Fair Value Measurement, Percentage of Appraised Value, Maximum | 86.00% | ||||||
| Fair Value Measurement, Percentage of Appraised Value, Weighted Average | 78.00% | ||||||
| |||||||
Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Interest-bearing cash and cash equivalents | $ 2,220,640 | $ 1,916,651 | $ 1,831,162 | |
| Trading securities | 677,156 | 337,628 | 279,539 | |
| Investment securities | 519,402 | 546,145 | 576,047 | |
| Available for sale securities | 8,437,291 | 8,676,829 | 8,886,036 | |
| Fair value option securities | 441,714 | 77,046 | 418,887 | |
| Residential mortgage loans held for sale | 248,707 | 301,897 | 332,040 | |
| Loans | 16,991,906 | 16,989,660 | 16,022,566 | |
| Allowance for loan losses | (248,710) | (246,159) | (233,156) | $ (225,524) |
| Loans, net of allowance | 16,743,196 | 16,743,501 | 15,789,410 | |
| Mortgage servicing rights | 249,403 | 247,073 | 196,055 | 218,605 |
| Derviative contracts, net of cash collateral, Assets, Fair value | 304,727 | 689,872 | 790,146 | |
| Time deposits | 2,243,848 | 2,221,800 | 2,341,374 | |
| Subordinated debentures | 144,649 | 144,640 | 226,385 | |
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 276,422 | 664,531 | 705,578 | |
| Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract] | ||||
| Specific allocation of allowance for loan losses included in fair value of loans | 221,000 | 218,000 | 208,000 | |
| Commercial | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 10,327,110 | 10,390,824 | 10,288,425 | |
| Allowance for loan losses | (137,616) | (140,213) | (139,793) | (130,334) |
| Commercial real estate | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 3,871,063 | 3,809,046 | 3,370,507 | |
| Allowance for loan losses | (58,343) | (50,749) | (44,453) | (41,391) |
| Residential mortgage | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 1,946,274 | 1,949,832 | 1,869,309 | |
| Allowance for loan losses | (18,177) | (18,224) | (18,467) | (19,509) |
| Personal | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 847,459 | 839,958 | 494,325 | |
| Allowance for loan losses | (7,247) | (8,773) | (5,022) | $ (4,164) |
| U.S. government agency debentures | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 18,365 | 6,234 | 59,733 | |
| U.S. government agency residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 578,977 | 310,067 | 146,896 | |
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | |
| Fair value option securities | 441,714 | 77,046 | 418,887 | |
| Municipal and other tax-exempt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 45,114 | 14,427 | 58,797 | |
| Investment securities | 298,811 | 320,364 | 347,684 | |
| Available for sale securities | 35,453 | 40,993 | 51,308 | |
| Other trading securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 34,700 | 6,900 | 14,113 | |
| U.S. Treasury | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 999 | 999 | 1,003 | |
| Privately issued residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | |
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | |
| Other debt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Investment securities | 201,213 | 205,004 | 202,997 | |
| Available for sale securities | 4,153 | 4,152 | 4,151 | |
| Perpetual preferred stock | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | |
| Equity securities and mutual funds | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 18,844 | 18,357 | 18,040 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Cash and due from banks | 546,575 | 620,846 | 481,510 | |
| Interest-bearing cash and cash equivalents | 2,220,640 | 1,916,651 | 1,831,162 | |
| Trading securities | 677,156 | 337,628 | 279,539 | |
| Investment securities | 519,402 | 546,145 | 576,047 | |
| Available for sale securities | 8,437,291 | 8,676,829 | 8,886,036 | |
| Residential mortgage loans held for sale | 248,707 | 301,897 | 332,040 | |
| Loans | 16,991,906 | 16,989,660 | 16,022,566 | |
| Allowance for loan losses | (248,710) | (246,159) | (233,156) | |
| Loans, net of allowance | 16,743,196 | 16,743,501 | 15,789,410 | |
| Mortgage servicing rights | 249,403 | 247,073 | 196,055 | |
| Derviative contracts, net of cash collateral, Assets, Fair value | 304,727 | 689,872 | 790,146 | |
| Deposits with no stated maturity | 20,331,511 | 20,526,295 | 18,076,946 | |
| Time deposits | 2,243,848 | 2,221,800 | 2,341,374 | |
| Other borrowed funds | 5,794,928 | 5,572,662 | 6,326,718 | |
| Subordinated debentures | 144,649 | 144,640 | 226,385 | |
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 276,422 | 664,531 | 705,578 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 10,327,110 | 10,390,824 | 10,288,425 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 3,871,063 | 3,809,046 | 3,370,507 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential mortgage | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 1,946,274 | 1,949,832 | 1,869,309 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Personal | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 847,459 | 839,958 | 494,325 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government agency debentures | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 18,365 | 6,234 | 59,733 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 578,977 | 310,067 | 146,896 | |
| Investment securities | 19,378 | 20,777 | 25,366 | |
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | |
| Fair value option securities | 441,714 | 77,046 | 418,887 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 45,114 | 14,427 | 58,797 | |
| Investment securities | 298,811 | 320,364 | 347,684 | |
| Available for sale securities | 35,453 | 40,993 | 51,308 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 34,700 | 6,900 | 14,113 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Treasury | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 999 | 999 | 1,003 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Investment securities | 201,213 | 205,004 | 202,997 | |
| Available for sale securities | 4,153 | 4,152 | 4,151 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Perpetual preferred stock | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | |
| Carrying (Reported) Amount, Fair Value Disclosure [Member] | Equity securities and mutual funds | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 18,844 | 18,357 | 18,040 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Cash and due from banks | 546,575 | 620,846 | 481,510 | |
| Interest-bearing cash and cash equivalents | 2,220,640 | 1,916,651 | 1,831,162 | |
| Trading securities | 677,156 | 337,628 | 279,539 | |
| Investment securities | 540,663 | 565,493 | 609,743 | |
| Available for sale securities | 8,437,291 | 8,676,829 | 8,886,036 | |
| Residential mortgage loans held for sale | 248,707 | 301,897 | 332,040 | |
| Loans | 16,702,382 | 17,178,060 | 15,839,847 | |
| Allowance for loan losses | 0 | 0 | 0 | |
| Loans, net of allowance | 16,702,382 | 17,178,060 | 15,839,847 | |
| Mortgage servicing rights | 249,403 | 247,073 | 196,055 | |
| Derviative contracts, net of cash collateral, Assets, Fair value | 304,727 | 689,872 | 790,146 | |
| Deposits with no stated maturity | 20,331,511 | 20,526,295 | 18,076,946 | |
| Time deposits | 2,207,968 | 2,218,303 | 2,339,734 | |
| Other borrowed funds | 5,790,533 | 5,556,327 | 6,309,208 | |
| Subordinated debentures | 140,888 | 128,903 | 224,314 | |
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 276,422 | 664,531 | 705,578 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 10,088,885 | 10,437,016 | 10,092,121 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 3,816,898 | 3,850,981 | 3,351,250 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 1,957,635 | 2,025,159 | 1,906,310 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Personal | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 838,964 | 864,904 | 490,166 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 18,365 | 6,234 | 59,733 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 578,977 | 310,067 | 146,896 | |
| Investment securities | 19,967 | 21,473 | 26,794 | |
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | |
| Fair value option securities | 441,714 | 77,046 | 418,887 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 45,114 | 14,427 | 58,797 | |
| Investment securities | 301,128 | 321,225 | 352,542 | |
| Available for sale securities | 35,453 | 40,993 | 51,308 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 34,700 | 6,900 | 14,113 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 999 | 999 | 1,003 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Investment securities | 219,568 | 222,795 | 230,407 | |
| Available for sale securities | 4,153 | 4,152 | 4,151 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | |
| Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 18,844 | 18,357 | 18,040 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Cash and due from banks | 546,575 | 620,846 | 481,510 | |
| Interest-bearing cash and cash equivalents | 2,220,640 | 1,916,651 | 1,831,162 | |
| Trading securities | 0 | 0 | 0 | |
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 4,905 | 4,494 | 4,219 | |
| Residential mortgage loans held for sale | 0 | 0 | 0 | |
| Loans | 0 | 0 | 0 | |
| Allowance for loan losses | 0 | 0 | 0 | |
| Loans, net of allowance | 0 | 0 | 0 | |
| Mortgage servicing rights | 0 | 0 | 0 | |
| Derviative contracts, net of cash collateral, Assets, Fair value | 23,128 | 7,541 | 29,533 | |
| Deposits with no stated maturity | 0 | 0 | 0 | |
| Time deposits | 0 | 0 | 0 | |
| Other borrowed funds | 0 | 0 | 0 | |
| Subordinated debentures | 0 | 0 | 0 | |
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 11,628 | 6,972 | 3,084 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 0 | 0 | 0 | |
| Fair value option securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 999 | 999 | 1,003 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 3,906 | 3,495 | 3,216 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Cash and due from banks | 0 | 0 | 0 | |
| Interest-bearing cash and cash equivalents | 0 | 0 | 0 | |
| Trading securities | 677,156 | 337,628 | 279,539 | |
| Investment securities | 540,663 | 565,493 | 609,743 | |
| Available for sale securities | 8,422,511 | 8,662,394 | 8,868,052 | |
| Residential mortgage loans held for sale | 236,028 | 290,280 | 323,941 | |
| Loans | 0 | 0 | 0 | |
| Allowance for loan losses | 0 | 0 | 0 | |
| Loans, net of allowance | 0 | 0 | 0 | |
| Mortgage servicing rights | 0 | 0 | 0 | |
| Derviative contracts, net of cash collateral, Assets, Fair value | 281,599 | 682,331 | 760,613 | |
| Deposits with no stated maturity | 0 | 0 | 0 | |
| Time deposits | 0 | 0 | 0 | |
| Other borrowed funds | 0 | 0 | 0 | |
| Subordinated debentures | 140,888 | 128,903 | 0 | |
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 264,794 | 657,559 | 702,494 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 18,365 | 6,234 | 59,733 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 578,977 | 310,067 | 146,896 | |
| Investment securities | 19,967 | 21,473 | 26,794 | |
| Available for sale securities | 5,372,916 | 5,460,386 | 5,716,525 | |
| Fair value option securities | 441,714 | 77,046 | 418,887 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 45,114 | 14,427 | 58,797 | |
| Investment securities | 301,128 | 321,225 | 352,542 | |
| Available for sale securities | 29,731 | 35,204 | 41,694 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 34,700 | 6,900 | 14,113 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 108,626 | 115,535 | 133,030 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 2,877,028 | 3,017,933 | 2,942,404 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Investment securities | 219,568 | 222,795 | 230,407 | |
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 19,272 | 18,474 | 19,575 | |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 14,938 | 14,862 | 14,824 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Cash and due from banks | 0 | 0 | 0 | |
| Interest-bearing cash and cash equivalents | 0 | 0 | 0 | |
| Trading securities | 0 | 0 | 0 | |
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 9,875 | 9,941 | 13,765 | |
| Residential mortgage loans held for sale | 12,679 | 11,617 | 8,099 | |
| Loans | 16,702,382 | 17,178,060 | 15,839,847 | |
| Allowance for loan losses | 0 | 0 | 0 | |
| Loans, net of allowance | 16,702,382 | 17,178,060 | 15,839,847 | |
| Mortgage servicing rights | 249,403 | 247,073 | 196,055 | |
| Derviative contracts, net of cash collateral, Assets, Fair value | 0 | 0 | 0 | |
| Deposits with no stated maturity | 20,331,511 | 20,526,295 | 18,076,946 | |
| Time deposits | 2,207,968 | 2,218,303 | 2,339,734 | |
| Other borrowed funds | 5,790,533 | 5,556,327 | 6,309,208 | |
| Subordinated debentures | 0 | 0 | 224,314 | |
| Derivative contracts, net of cash margin, Liabilities, Fair Value | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 10,088,885 | 10,437,016 | 10,092,121 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 3,816,898 | 3,850,981 | 3,351,250 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 1,957,635 | 2,025,159 | 1,906,310 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Loans | 838,964 | 864,904 | 490,166 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 0 | 0 | 0 | |
| Fair value option securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 5,722 | 5,789 | 9,614 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Trading securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Investment securities | 0 | 0 | 0 | |
| Available for sale securities | 4,153 | 4,152 | 4,151 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | 0 | 0 | 0 | |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Available for sale securities | $ 0 | $ 0 | $ 0 |
Fair Value Measurements Financial Instruments, Quantitative Information (Details) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
|
| Time deposits [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 0.03% | 0.02% | 0.02% |
| Contractual Yield, Maximum | 10.00% | 10.00% | 9.65% |
| Repricing (in years) | 1 year 329 days | 2 years 18 days | 1 year 350 days |
| Discount Rate, Minimum | 1.67% | 1.15% | 1.57% |
| Discount Rate, Maximum | 2.09% | 1.47% | 2.00% |
| Other borrowings [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 0.25% | 0.25% | 0.25% |
| Contractual Yield, Maximum | 3.42% | 0.80% | 3.50% |
| Repricing (in years) | 7 days | 1 day | 1 day |
| Discount Rate, Minimum | 0.82% | 0.25% | 0.55% |
| Discount Rate, Maximum | 3.44% | 2.89% | 3.22% |
| Subordinated debentures [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 5.38% | 1.31% | 5.38% |
| Contractual Yield, Maximum | 5.38% | 1.31% | 5.38% |
| Repricing (in years) | 16 years 259 days | 1 year 44 days | 16 years 314 days |
| Discount Rate, Minimum | 5.54% | 2.13% | 6.11% |
| Discount Rate, Maximum | 5.54% | 2.13% | 6.11% |
| Commercial | Loans Receivable [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 0.38% | 0.38% | 0.38% |
| Contractual Yield, Maximum | 30.00% | 30.00% | 30.00% |
| Repricing (in years) | 245 days | 267 days | 256 days |
| Discount Rate, Minimum | 0.62% | 0.46% | 0.64% |
| Discount Rate, Maximum | 4.68% | 3.92% | 4.60% |
| Commercial real estate | Loans Receivable [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 0.38% | 0.38% | 0.38% |
| Contractual Yield, Maximum | 18.00% | 18.00% | 18.00% |
| Repricing (in years) | 266 days | 263 days | 259 days |
| Discount Rate, Minimum | 1.00% | 0.85% | 0.94% |
| Discount Rate, Maximum | 4.37% | 3.60% | 4.27% |
| Residential mortgage | Loans Receivable [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 1.74% | 1.68% | 1.74% |
| Contractual Yield, Maximum | 18.00% | 18.00% | 18.00% |
| Repricing (in years) | 2 years 95 days | 2 years 26 days | 2 years 99 days |
| Discount Rate, Minimum | 1.83% | 1.23% | 1.71% |
| Discount Rate, Maximum | 4.26% | 3.73% | 4.26% |
| Personal | Loans Receivable [Member] | |||
| Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items] | |||
| Contractual Yield, Minimum | 0.25% | 0.38% | 0.25% |
| Contractual Yield, Maximum | 21.00% | 21.00% | 21.00% |
| Repricing (in years) | 110 days | 135 days | 146 days |
| Discount Rate, Minimum | 0.77% | 0.78% | 1.03% |
| Discount Rate, Maximum | 4.71% | 4.01% | 4.59% |
Federal and State Income Taxes Federal and State Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Effective Income Tax Rate Reconciliation, Amount [Abstract] | ||
| Federal statutory tax | $ 44,368 | $ 21,846 |
| Tax exempt revenue | (3,111) | (2,532) |
| Effect of state income taxes, net of federal benefit | 2,445 | 2,301 |
| Utilization of tax credits: | ||
| Low-income housing tax credit, net of amortization | (1,723) | (1,310) |
| Other tax credits | (364) | (521) |
| Bank-owned life insurance | (772) | (791) |
| Share-based Compensation | (3,937) | 0 |
| Other, net | 1,197 | 2,435 |
| Total income tax expense | $ 38,103 | $ 21,428 |
| Effective Income Tax Rate Reconciliation, Percent [Abstract] | ||
| Federal statutory tax (in hundredths) | 35.00% | 35.00% |
| Tax exempt revenue (in hundredths) | (2.40%) | (4.10%) |
| Effect of state income taxes, net of federal benefit (in hundredths) | 1.90% | 3.70% |
| Utilization of tax credits: [Abstract] | ||
| Low-income housing tax credit, net of amortization (in hundredths) | (1.40%) | (2.10%) |
| Other tax credits (in hundredths) | (0.30%) | (0.80%) |
| Bank-owned life insurance (in hundredths) | (0.60%) | (1.30%) |
| Share-based compensation | (3.10%) | 0.00% |
| Other, net (in hundredths) | 1.00% | 3.90% |
| Total (in hundredths) | 30.10% | 34.30% |