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Fair Value of Assets and Liabilities - Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 1,346,207 | $ 1,448,168
Loans held-for-sale | 14,033 | 16,273
Securities available-for-sale | 4,445,403 | 4,626,470
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 14,033 | 16,273
Securities available-for-sale | 4,445,403 | 4,626,470
Total other assets | 252,573 | 141,494
Total assets | 6,058,216 | 6,232,405
Total other liabilities | 67,480 | 133,713
Total liabilities | 573,061 | 469,093
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 0 | 0
Securities available-for-sale | 0 | 0
Total other assets | 90,098 | 88,845
Total assets | 90,098 | 88,845
Total other liabilities | 19,807 | 30,236
Total liabilities | 19,807 | 30,236
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 0 | 0
Securities available-for-sale | 4,426,267 | 4,616,568
Total other assets | 162,475 | 52,649
Total assets | 5,934,008 | 6,115,861
Total other liabilities | 24,878 | 71,937
Total liabilities | 530,459 | 407,317
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 14,033 | 16,273
Securities available-for-sale | 19,136 | 9,902
Total other assets | 0 | 0
Total assets | 34,110 | 27,699
Total other liabilities | 22,795 | 31,540
Total liabilities | 22,795 | 31,540
U.S. treasuries | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 100 | 98
U.S. treasuries | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
U.S. treasuries | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 100 | 98
U.S. treasuries | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Government agency issued mortgage-backed securities (“MBS”) | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 2,348,517 | 2,420,106
Government agency issued mortgage-backed securities (“MBS”) | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Government agency issued mortgage-backed securities (“MBS”) | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 2,348,517 | 2,420,106
Government agency issued mortgage-backed securities (“MBS”) | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Government agency issued collateralized mortgage obligations (“CMO”) | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 1,670,492 | 1,958,695
Government agency issued collateralized mortgage obligations (“CMO”) | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Government agency issued collateralized mortgage obligations (“CMO”) | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 1,670,492 | 1,958,695
Government agency issued collateralized mortgage obligations (“CMO”) | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Other U.S. government agencies | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 306,092 | 149,786
Other U.S. government agencies | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Other U.S. government agencies | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 306,092 | 149,786
Other U.S. government agencies | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
States and municipalities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 60,526 | 32,573
States and municipalities | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
States and municipalities | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 60,526 | 32,573
States and municipalities | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Corporates and other debt | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 40,540 | 55,310
Corporates and other debt | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Corporates and other debt | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 40,540 | 55,310
Corporates and other debt | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Interest-Only Strip (elected fair value) | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 19,136 | 9,902
Interest-Only Strip (elected fair value) | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Interest-Only Strip (elected fair value) | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 0 | 0
Interest-Only Strip (elected fair value) | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available-for-sale | 19,136 | 9,902
Fixed Income | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 1,345,266 | 1,446,644
Total trading liabilities - fixed income | 505,581 | 335,380
Fixed Income | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 1,345,266 | 1,446,644
Total trading liabilities - fixed income | 505,581 | 335,380
Fixed Income | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | U.S. treasuries | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 134,844 | 169,799
Total trading liabilities - fixed income | 406,380 | 207,739
Fixed Income | U.S. treasuries | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | U.S. treasuries | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 134,844 | 169,799
Total trading liabilities - fixed income | 406,380 | 207,739
Fixed Income | U.S. treasuries | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | Government agency issued mortgage-backed securities (“MBS”) | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 268,024 | 133,373
Total trading liabilities - fixed income | 33 |
Fixed Income | Government agency issued mortgage-backed securities (“MBS”) | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 |
Fixed Income | Government agency issued mortgage-backed securities (“MBS”) | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 268,024 | 133,373
Total trading liabilities - fixed income | 33 |
Fixed Income | Government agency issued mortgage-backed securities (“MBS”) | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 |
Fixed Income | Government agency issued collateralized mortgage obligations (“CMO”) | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 250,652 | 330,456
Fixed Income | Government agency issued collateralized mortgage obligations (“CMO”) | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Fixed Income | Government agency issued collateralized mortgage obligations (“CMO”) | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 250,652 | 330,456
Fixed Income | Government agency issued collateralized mortgage obligations (“CMO”) | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Fixed Income | Other U.S. government agencies | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 124,972 | 76,733
Total trading liabilities - fixed income | 88 | 98
Fixed Income | Other U.S. government agencies | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | Other U.S. government agencies | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 124,972 | 76,733
Total trading liabilities - fixed income | 88 | 98
Fixed Income | Other U.S. government agencies | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | States and municipalities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 120,744 | 54,234
Fixed Income | States and municipalities | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Fixed Income | States and municipalities | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 120,744 | 54,234
Fixed Income | States and municipalities | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Fixed Income | Corporates and other debt | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 445,253 | 682,068
Total trading liabilities - fixed income | 99,080 | 127,543
Fixed Income | Corporates and other debt | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | Corporates and other debt | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 445,253 | 682,068
Total trading liabilities - fixed income | 99,080 | 127,543
Fixed Income | Corporates and other debt | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Fixed Income | Equity, mutual funds, and other | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 777 | (19)
Fixed Income | Equity, mutual funds, and other | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Fixed Income | Equity, mutual funds, and other | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 777 | (19)
Fixed Income | Equity, mutual funds, and other | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Trading securities—mortgage banking | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 941 | 1,524
Trading securities—mortgage banking | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Trading securities—mortgage banking | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Trading securities—mortgage banking | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 941 | 1,524
Deferred compensation mutual funds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 46,815 | 37,771
Deferred compensation mutual funds | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 46,815 | 37,771
Deferred compensation mutual funds | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Deferred compensation mutual funds | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Equity, mutual funds, and other | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 22,643 | 22,248
Equity, mutual funds, and other | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 22,643 | 22,248
Equity, mutual funds, and other | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Equity, mutual funds, and other | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Derivatives, forwards and futures | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 20,640 | 28,826
Total other liabilities | 19,807 | 30,236
Derivatives, forwards and futures | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 20,640 | 28,826
Total other liabilities | 19,807 | 30,236
Derivatives, forwards and futures | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, forwards and futures | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, interest rate contracts | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 162,413 | 52,214
Total other liabilities | 24,412 | 71,853
Derivatives, interest rate contracts | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, interest rate contracts | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 162,413 | 52,214
Total other liabilities | 24,412 | 71,853
Derivatives, interest rate contracts | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, other | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 62 | 435
Total other liabilities | 23,261 | 31,624
Derivatives, other | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, other | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 62 | 435
Total other liabilities | 466 | 84
Derivatives, other | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | $ 22,795 | $ 31,540

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