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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Commitments to extend credit    
Other Commitments [Line Items]    
Fixed Rate $ 2,167 $ 1,851
Variable Rate 288,770 335,654
Unused lines of credit    
Other Commitments [Line Items]    
Fixed Rate 1,514 19,085
Variable Rate 1,119,158 1,309,170
Letters of credit    
Other Commitments [Line Items]    
Fixed Rate 1,266 1,050
Variable Rate $ 8,561 $ 12,976