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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - MFP Program Recourse Exposure (Details) - USD ($) $ in Thousands	3 Months Ended
	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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Other expenses estimating losses (recovery).

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