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Fair Value of Assets & Liabilities - Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | $ 1,930,991 | $ 1,416,345
Loans held-for-sale (elected fair value) | 16,418 | 20,881
Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale (elected fair value) | 16,418 | 20,881
Securities available-for-sale | 4,608,383 | 4,931,402
Total other assets | 117,529 | 121,456
Total assets | 6,673,321 | 6,490,084
Total other liabilities | 170,324 | 85,061
Total liabilities | 910,018 | 723,576
Recurring | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 40,912 | 39,822
Recurring | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 20,013 | 10,161
Total other liabilities | 18,770 | 9,535
Recurring | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 34,333 | 71,473
Total other liabilities | 117,236 | 69,842
Recurring | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 130 |
Total other liabilities | 34,318 | 5,684
Recurring | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 98 | 99
Recurring | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 2,414,877 | 2,577,376
Recurring | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 1,991,184 | 2,269,858
Recurring | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 113,088 |
Recurring | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 23,701 |
Recurring | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 55,074 | 55,782
Recurring | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale |  | 27,017
Total other assets | 22,141 |
Recurring | Interest-only strips (elected fair value) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 10,361 | 1,270
Recurring | Trading securities—fixed income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,929,399 | 1,414,194
Total trading liabilities—fixed income | 739,694 | 638,515
Recurring | Trading securities—fixed income | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 121,490 | 128,995
Total trading liabilities—fixed income | 574,897 | 506,679
Recurring | Trading securities—fixed income | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 235,403 | 227,038
Recurring | Trading securities—fixed income | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 568,344 | 275,014
Recurring | Trading securities—fixed income | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 43,642 | 54,699
Recurring | Trading securities—fixed income | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 54,669 | 34,573
Total trading liabilities—fixed income | 110 |
Recurring | Trading securities—fixed income | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 866,128 | 693,877
Total trading liabilities—fixed income | 164,687 | 131,836
Recurring | Trading securities—fixed income | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 39,723 | (2)
Recurring | Trading securities—mortgage banking |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,592 | 2,151
Recurring | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale (elected fair value) | 0 | 0
Securities available-for-sale | 0 | 27,017
Total other assets | 83,066 | 49,983
Total assets | 83,066 | 77,000
Total other liabilities | 18,770 | 9,535
Total liabilities | 18,770 | 9,535
Recurring | Level 1 | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 40,912 | 39,822
Recurring | Level 1 | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 20,013 | 10,161
Total other liabilities | 18,770 | 9,535
Recurring | Level 1 | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Recurring | Level 1 | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 |
Total other liabilities | 0 | 0
Recurring | Level 1 | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 1 | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 1 | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 1 | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 |
Recurring | Level 1 | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 |
Recurring | Level 1 | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 1 | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale |  | 27,017
Total other assets | 22,141 |
Recurring | Level 1 | Interest-only strips (elected fair value) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 1 | Trading securities—fixed income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 | 0
Recurring | Level 1 | Trading securities—fixed income | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 | 0
Recurring | Level 1 | Trading securities—fixed income | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 1 | Trading securities—fixed income | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 1 | Trading securities—fixed income | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 1 | Trading securities—fixed income | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 |
Recurring | Level 1 | Trading securities—fixed income | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 | 0
Recurring | Level 1 | Trading securities—fixed income | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 1 | Trading securities—mortgage banking |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale (elected fair value) | 182 | 1,955
Securities available-for-sale | 4,598,022 | 4,903,115
Total other assets | 34,463 | 71,473
Total assets | 6,562,066 | 6,390,737
Total other liabilities | 117,342 | 69,881
Total liabilities | 857,036 | 708,396
Recurring | Level 2 | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Recurring | Level 2 | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets |  | 0
Total other liabilities | 0 | 0
Recurring | Level 2 | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 34,333 | 71,473
Total other liabilities | 117,236 | 69,842
Recurring | Level 2 | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 130 |
Total other liabilities | 106 | 39
Recurring | Level 2 | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 98 | 99
Recurring | Level 2 | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 2,414,877 | 2,577,376
Recurring | Level 2 | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 1,991,184 | 2,269,858
Recurring | Level 2 | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 113,088 |
Recurring | Level 2 | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 23,701 |
Recurring | Level 2 | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 55,074 | 55,782
Recurring | Level 2 | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale |  | 0
Total other assets | 0 |
Recurring | Level 2 | Interest-only strips (elected fair value) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 2 | Trading securities—fixed income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,929,399 | 1,414,194
Total trading liabilities—fixed income | 739,694 | 638,515
Recurring | Level 2 | Trading securities—fixed income | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 121,490 | 128,995
Total trading liabilities—fixed income | 574,897 | 506,679
Recurring | Level 2 | Trading securities—fixed income | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 235,403 | 227,038
Recurring | Level 2 | Trading securities—fixed income | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 568,344 | 275,014
Recurring | Level 2 | Trading securities—fixed income | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 43,642 | 54,699
Recurring | Level 2 | Trading securities—fixed income | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 54,669 | 34,573
Total trading liabilities—fixed income | 110 |
Recurring | Level 2 | Trading securities—fixed income | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 866,128 | 693,877
Total trading liabilities—fixed income | 164,687 | 131,836
Recurring | Level 2 | Trading securities—fixed income | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 39,723 | (2)
Recurring | Level 2 | Trading securities—mortgage banking |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale (elected fair value) | 16,236 | 18,926
Securities available-for-sale | 10,361 | 1,270
Total other assets | 0 | 0
Total assets | 28,189 | 22,347
Total other liabilities | 34,212 | 5,645
Total liabilities | 34,212 | 5,645
Recurring | Level 3 | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Recurring | Level 3 | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Recurring | Level 3 | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Recurring | Level 3 | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 |
Total other liabilities | 34,212 | 5,645
Recurring | Level 3 | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 3 | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 3 | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 3 | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 |
Recurring | Level 3 | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 |
Recurring | Level 3 | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Recurring | Level 3 | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale |  | 0
Total other assets | 0 |
Recurring | Level 3 | Interest-only strips (elected fair value) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 10,361 | 1,270
Recurring | Level 3 | Trading securities—fixed income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 | 0
Recurring | Level 3 | Trading securities—fixed income | U.S. treasuries |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 | 0
Recurring | Level 3 | Trading securities—fixed income | Government agency issued MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 3 | Trading securities—fixed income | Government agency issued CMO |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 3 | Trading securities—fixed income | Other U.S. government agencies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 3 | Trading securities—fixed income | States and municipalities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 |
Recurring | Level 3 | Trading securities—fixed income | Corporates and other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities—fixed income | 0 | 0
Recurring | Level 3 | Trading securities—fixed income | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Recurring | Level 3 | Trading securities—mortgage banking |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | $ 1,592 | $ 2,151

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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