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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - MFP Program Recourse Exposure (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Mortgage Partnership Finance Program
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
MPF program recourse loss recoveries	$ (76)	$ (35)	$ (155)	$ (26)

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