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FAIR VALUE - Schedule of Changes in Fair Value of Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Impaired loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Changes in fair value of impaired loans still held at June 30 $ 4 $ 183 $ 162 $ 2