CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 12,947	$ 14,819	$ 38,329	$ 42,356
OTHER COMPREHENSIVE INCOME, NET OF INCOME TAXES:
Unrealized holding gain (loss) on available-for-sale securities arising during the period	1,169	(1,641)	2,051	3,195
Income tax benefit (expense) related to available-for-sale securities unrealized holding gain (loss)	(421)	597	(738)	(1,150)
Reclassification for net gains on available-for-sale securities realized in earnings	0	(6)	(125)	(40)
Income tax benefit related to available-for-sale securities realized gains	0	2	45	14
Other comprehensive income (loss)	748	(1,048)	1,233	2,019
COMPREHENSIVE INCOME	$ 13,695	$ 13,771	$ 39,562	$ 44,375