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SECURITIES - Gains and Losses on Sales of Securities Available for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]      
Gross gains on sales of securities $ 38 $ 312 $ 396
Gross losses on sales of securities (1) (218) (259)
Net realized gains on sales of securities available for sale $ 37 $ 94 $ 137