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FAIR VALUE - Schedule of Changes in Fair Value of Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Impaired loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Changes in fair value of impaired loans still held $ 43 $ 684 $ 41 $ 815