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Outstanding Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Commitments to extend credit    
Credit Commitments and Contingencies    
Financial instruments whose contract amounts represent credit risk: $ 1,759,035 $ 1,754,370
Standby letters of credit    
Credit Commitments and Contingencies    
Financial instruments whose contract amounts represent credit risk: $ 39,643 $ 38,937