INCOME TAXES, Summary of Provision for Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal [Abstract]
Current	$ 15,523	$ 16,659	$ 4,289
Deferred	6,118	1,059	1,393
Federal income tax expense	21,641	17,718	5,682
State [Abstract]
Current	2,489	2,204	0
Deferred	623	186	809
State income tax expense	3,112	2,390	809
Income tax expense total	$ 24,753	$ 20,108	$ 6,491