Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 20,009	$ 15,709
Securities:
Net change in unrealized gain on securities	20,067	11,478
Reclassification adjustment for net gains realized in net income	(3,756)	(4,353)
Net change in non-credit related other than temporary impairment	7	24
Income taxes	(6,524)	(2,859)
Other comprehensive income on securities	9,794	4,290
Derivatives used in cash flow hedging relationships:
Net change in unrealized loss on derivatives	(3,423)	(1,454)
Reclassification adjustment for net loss on derivatives realized in net income	506	564
Income taxes	1,074	327
Other comprehensive loss on cash flow hedges	(1,843)	(563)
Other comprehensive income	7,951	3,727
TOTAL COMPREHENSIVE INCOME	$ 27,960	$ 19,436