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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, 2019
Dec. 31, 2018
Commitments to extend credit    
Other Commitments [Line Items]    
Fixed Rate $ 473 $ 2,167
Variable Rate 129,495 288,770
Unused lines of credit    
Other Commitments [Line Items]    
Fixed Rate 703 1,514
Variable Rate 1,049,632 1,119,158
Letters of credit    
Other Commitments [Line Items]    
Fixed Rate 134 1,266
Variable Rate $ 5,316 $ 8,561