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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Schedule of Net Amount Expensed (Recovered) Through Noninterest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]      
Off-balance sheet credit exposures expense $ 182 $ 32 $ 312