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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Schedule of MPF Program Recourse (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
MPF Program      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
MPF program recourse loss expense (recovery) $ (135) $ 25 $ 18