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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
MPF Program |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
MPF program recourse loss expense | $ 25 | $ 18 | $ 127

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- Details
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