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COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS - Fixed Rate Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Total commitments outstanding $ 984,312 $ 814,908
Fixed rate loan commitments outstanding 5,100 5,900
Variable rate loan commitments outstanding 145,400 111,100
Loan commitments outstanding    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Total commitments outstanding $ 150,515 $ 117,044