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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - MFP Program Recourse Exposure (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Mortgage Partnership Finance Program |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
MPF program recourse loss expense (recovery) | $ (79) | $ 9

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