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INCOME TAXES - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current provision:      
Federal $ 8,623 $ 7,263 $ 5,056
State 546 261 300
Deferred (benefit) provision:      
Federal 1,511 (507) 1,256
State 8 (355) 53
Total income tax provision $ 10,688 $ 6,662 $ 6,665