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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Reserve for off-balance sheet credit exposures	$ 876	$ 816
Mortgage Partnership Finance Program
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Sum of total loans sold under the MPF Program	29,585	31,977
Limited recourse debt	$ 1,085	$ 1,135

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Limited recourse debt.

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Sum total of loans sold under the mortgage partnership finance program.

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