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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Commitments to extend credit    
Other Commitments [Line Items]    
Fixed Rate $ 17,555 $ 473
Variable Rate 38,141 129,495
Unused lines of credit    
Other Commitments [Line Items]    
Fixed Rate 1,783 703
Variable Rate 1,348,138 1,049,632
Letters of credit    
Other Commitments [Line Items]    
Fixed Rate 234 134
Variable Rate $ 8,274 $ 5,316