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Outstanding Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Credit Commitments and Contingencies    
Total commitments $ 1,823,255 $ 1,793,307
Commitments to extend credit    
Credit Commitments and Contingencies    
Total commitments 1,785,205 1,754,370
Standby letters of credit    
Credit Commitments and Contingencies    
Total commitments $ 38,050 $ 38,937