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Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Derivative [Line Items] |  |
Derivative asset, fair value | $ 190,003 | $ 331,269
Derivative liability, gross liability | (108,839) | (165,210)
Interest Rate Lock Commitments [Member] |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 274,909 | 382,903
Derivative liability, notional amount | 40,007 | 3,154
Derivative asset, fair value | 2,198 | 8,034
Derivative liability, gross liability | (316) | (35)
Forward Commitments [Member] |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 91,264 | 0
Derivative liability, notional amount | 0 | 292,262
Derivative asset, fair value | 4,650 | 0
Derivative liability, gross liability | 0 | (2,263)
Interest Rate Swap with Customer [Member] |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 3,169,658 | 3,834,062
Derivative liability, notional amount | 769,300 | 45,640
Derivative asset, fair value | 179,934 | 330,951
Derivative liability, gross liability | (9,721) | (2)
Interest Rate Swap With Counterparty [Member] |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 769,300 | 45,640
Derivative liability, notional amount | 3,169,658 | 3,834,062
Derivative asset, fair value | 9,721 | 2
Derivative liability, gross liability | (98,368) | (165,205)
Balance Sheet Hedging Instruments |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 0 | 0
Derivative liability, notional amount | 500,000 | 0
Derivative asset, fair value | 305 | 0
Derivative liability, gross liability | (492) | 0
Foreign Exchange Contracts With Customer [Member] |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 12,196 | 1,121
Derivative liability, notional amount | 552 | 5,963
Derivative asset, fair value | 280 | 5
Derivative liability, gross liability | (14) | (275)
Foreign Exchange Contracts With Correspondent Banks [Member] |  |
Derivative [Line Items] |  |
Derivative asset, notional amount | 2,821 | 6,372
Derivative liability, notional amount | 12,213 | 1,422
Derivative asset, fair value | 43 | 318
Derivative liability, gross liability | $ (258) | $ (5)

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