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Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative asset, fair value $ 212,195 $ 331,269
Derivative liability, gross liability (107,329) (165,210)
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 335,010 382,903
Derivative liability, notional amount 1,688 3,154
Derivative asset, fair value 3,595 8,034
Derivative liability, gross liability (10) (35)
Forward Commitments [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 0 0
Derivative liability, notional amount 54,000 292,262
Derivative asset, fair value 0 0
Derivative liability, gross liability (211) (2,263)
Interest Rate Swap with Customer [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 3,315,775 3,834,062
Derivative liability, notional amount 542,265 45,640
Derivative asset, fair value 210,570 330,951
Derivative liability, gross liability (1,301) (2)
Interest Rate Swap With Counterparty [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 542,265 45,640
Derivative liability, notional amount 3,315,775 3,834,062
Derivative asset, fair value 1,301 2
Derivative liability, gross liability (105,883) (165,205)
Balance Sheet Hedging Instruments    
Derivative [Line Items]    
Derivative asset, notional amount 500,000 0
Derivative liability, notional amount 0 0
Derivative asset, fair value 235 0
Derivative liability, gross liability 0 0
Foreign Exchange Contracts With Customer [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 11,672 1,121
Derivative liability, notional amount 1,463 5,963
Derivative asset, fair value 143 5
Derivative liability, gross liability (48) (275)
Foreign Exchange Contracts With Correspondent Banks [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 5,582 6,372
Derivative liability, notional amount 10,942 1,422
Derivative asset, fair value 89 318
Derivative liability, gross liability $ (145) $ (5)