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Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative asset, fair value $ 186,886 $ 331,269
Derivative liability, gross liability (97,302) (165,210)
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 304,893 382,903
Derivative liability, notional amount 3,366 3,154
Derivative asset, fair value 2,990 8,034
Derivative liability, gross liability (18) (35)
Forward Commitments [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 53,000 0
Derivative liability, notional amount 0 292,262
Derivative asset, fair value 630 0
Derivative liability, gross liability 0 (2,263)
Interest Rate Swap with Customer [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 3,205,646 3,834,062
Derivative liability, notional amount 701,719 45,640
Derivative asset, fair value 183,850 330,951
Derivative liability, gross liability (2,633) (2)
Interest Rate Swap With Counterparty [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 701,719 45,640
Derivative liability, notional amount 3,205,646 3,834,062
Derivative asset, fair value 2,633 2
Derivative liability, gross liability (94,235) (165,205)
Balance Sheet Hedging Instruments    
Derivative [Line Items]    
Derivative asset, notional amount 400,000 0
Derivative liability, notional amount 100,000 0
Derivative asset, fair value 377 0
Derivative liability, gross liability (150) 0
Foreign Exchange Contracts With Customer [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 9,782 1,121
Derivative liability, notional amount 649 5,963
Derivative asset, fair value 293 5
Derivative liability, gross liability (13) (275)
Foreign Exchange Contracts With Correspondent Banks [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 1,525 6,372
Derivative liability, notional amount 10,554 1,422
Derivative asset, fair value 26 318
Derivative liability, gross liability $ (284) $ (5)