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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:                      
Federal                 $ 8,762 $ 14,730 $ 8,248
State                 937 780 1,230
Total current                 9,699 15,510 9,478
Deferred:                      
Federal                 10,251 2,388 1,457
State                 (1,004) 897 (157)
Total deferred                 9,247 3,285 1,300
Income tax expense $ 5,422 $ 4,703 $ 4,505 $ 4,316 $ 4,824 $ 4,663 $ 4,664 $ 4,644 $ 18,946 $ 18,795 $ 10,778
[1] 2017 amount includes a charge to write-down deferred tax assets due to the enactment of the Tax Act of $7.6 million.