Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 15,160	$ 10,774	$ 30,869	$ 17,664
Securities:
Net change in unrealized gain (loss) on securities	(2,764)	9,772	8,714	30,682
Reclassification adjustment for net gains realized in net income	(3,110)	(854)	(7,463)	(1,635)
Net change in non-credit related other than temporary impairment	24	24	48	48
Income taxes	2,361	(3,523)	(498)	(11,482)
Other comprehensive income (loss) on securities	(3,489)	5,419	801	17,613
Derivatives used in cash flow hedging relationships:
Net change in unrealized loss on derivatives	1,509	(936)	55	(1,075)
Reclassification adjustment for net loss on derivatives realized in net income	559	573	1,123	1,094
Income taxes	(775)	135	(448)	(7)
Other comprehensive income (loss) on cash flow hedges	1,293	(228)	730	12
Other comprehensive income (loss)	(2,196)	5,191	1,531	17,625
TOTAL COMPREHENSIVE INCOME	$ 12,964	$ 15,965	$ 32,400	$ 35,289