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INCOME TAXES - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current provision:      
Federal $ 5,056 $ 4,275 $ 2,325
State 300 143 99
Deferred provision (benefit):      
Federal 1,256 (762) 57
State 53 (43) 21
Total income tax provision $ 6,665 $ 3,613 $ 2,502