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COMPREHENSIVE INCOME - Components of accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accumulated other comprehensive income $ 179 $ 477
Statements of Comprehensive Income (Loss)    
Unrealized gains on securities available-for-sale, net of tax 179 477
Accumulated other comprehensive income $ 179 $ 477