INCOME TAXES (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 expense
Federal									$ 26,549	$ 11,946	$ 14,709
State									8,883	5,052	6,350
Total current expense									35,432	16,998	21,059
Deferred expense (benefit)
Federal									153	8,466	2,877
State									(158)	1,754	(37)
Total deferred expense (benefit)									(5)	10,220	2,840
Total expense	$ 7,698	$ 9,793	$ 9,508	$ 8,428	$ 8,268	$ 7,867	$ 7,213	$ 3,869	$ 35,427	$ 27,218	$ 23,899