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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | 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 expense |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 28,852 | $ 26,549 | $ 11,946
State |  |  |  |  |  |  |  |  | 9,278 | 8,883 | 5,052
Total current expense |  |  |  |  |  |  |  |  | 38,130 | 35,432 | 16,998
Deferred expense (benefit) |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 7,953 | 153 | 8,466
State |  |  |  |  |  |  |  |  | 1,258 | (158) | 1,754
Total deferred expense (benefit) |  |  |  |  |  |  |  |  | 9,211 | (5) | 10,220
Total expense | $ 14,915 | $ 12,681 | $ 10,731 | $ 9,014 | $ 7,698 | $ 9,793 | $ 9,508 | $ 8,428 | $ 47,341 | $ 35,427 | $ 27,218

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