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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Reserve for off-balance sheet credit exposures $ 832 $ 816
Mortgage Partnership Finance Program    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Sum of total loans sold under the MPF Program 31,659 31,977
Limited recourse debt $ 1,135 $ 1,135