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COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS - Commitments Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Commitments outstanding    
Total commitments outstanding $ 984,312 $ 814,908
Standby letters of credit    
Commitments outstanding    
Total commitments outstanding 25,501 23,670
Loan commitments outstanding    
Commitments outstanding    
Total commitments outstanding 150,515 117,044
Unused lines of credit    
Commitments outstanding    
Total commitments outstanding $ 808,296 $ 674,194