INCOME TAXES, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of effective federal and state tax rates to income before provision for income tax benefit [Abstract]
Computed expected tax expense provision, at federal rate	$ 22,829	$ 19,887	$ 6,535
State tax, net of federal tax benefit	2,291	1,696	698
Tax-exempt interest	(445)	(312)	(31)
Income subject to dividends-received deduction	(109)	(136)	(97)
Return to provision and rate changes	119	(1,027)	(306)
Other	68	0	(308)
Income tax expense total	$ 24,753	$ 20,108	$ 6,491