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INCOME TAXES - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:                      
Federal tax expense                 $ 6,758 $ 4,696 $ 294
State tax expense                 1,101 (1,631) 305
Total current expense                 7,859 3,065 599
Deferred:                      
Federal tax expense                 9,438 2,023 8,685
State tax expense                 1,591 (24) 2,509
Total deferred tax expense                 11,029 1,999 11,194
Change in valuation allowance                 (104) 0 (30)
Income tax expense $ 362 $ 6,953 $ 5,249 $ 6,220 $ 2,273 $ 1,350 $ 1,144 $ 297 $ 18,784 $ 5,064 $ 11,763