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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]                      
Current - federal                 $ 15,215 $ 10,499 $ 5,237
Current - state                 1,026 467 505
Deferred - federal                 (344) 6,516 3,543
Provision for income taxes $ 3,296 $ 7,368 $ 486 $ 4,747 $ 4,167 $ 5,122 $ 4,270 $ 3,923 $ 15,897 $ 17,482 $ 9,285