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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

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