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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - MFP Program Recourse Exposure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Mortgage Partnership Finance Program
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
MPF program recourse loss expense (recovery)	$ 45	$ 0	$ 19	$ (112)

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Other expenses estimating losses (recovery).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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