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INCOME TAXES - Provision for income tax expense (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
INCOME TAXES
Current federal income tax									$ 13,364	$ 11,269	$ 12,353
Current state income tax									157	140	102
Deferred income tax									2,932	601	(1,664)
Total income tax expense	$ 6,313	$ 3,927	$ 3,181	$ 3,032	$ 3,322	$ 3,032	$ 2,845	$ 2,811	$ 16,453	$ 12,010	$ 10,791

X

- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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-Publisher FASB
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