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INCOME TAXES ( Summary of Income Tax Expense) (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                 $ 23,749 $ 19,992 $ 18,877
Deferred federal                 268 1,378 1,118
Current state                 1,086 1,257 1,650
Deferred state                 30 206 740
Total income tax expense $ 6,582 $ 6,498 $ 6,091 $ 5,962 $ 5,878 $ 5,841 $ 5,656 $ 5,458 $ 25,133 $ 22,833 $ 22,385