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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Non-hedging derivative financial instruments    
Derivative Financial Instruments    
Derivative, Notional Amount $ 1,101,807 $ 1,226,150
Asset derivatives, Fair value 21,187 48,141
Liability derivatives, Fair value 21,183 47,971
Interest rate swap contracts    
Derivative Financial Instruments    
Asset derivatives, Fair value 24,436 52,872
Interest rate swap contracts | Non-hedging derivative financial instruments    
Derivative Financial Instruments    
Derivative, Notional Amount 1,064,721 1,155,252
Asset derivatives, Fair value 20,735 46,654
Liability derivatives, Fair value 21,172 47,681
Loan commitments | Non-hedging derivative financial instruments    
Derivative Financial Instruments    
Derivative, Notional Amount 15,086 32,588
Asset derivatives, Fair value 452 1,487
Liability derivatives, Fair value 0 0
Forward contracts - mortgage loan | Non-hedging derivative financial instruments    
Derivative Financial Instruments    
Derivative, Notional Amount 22,000 38,310
Asset derivatives, Fair value 0 0
Liability derivatives, Fair value $ 11 $ 290