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	$ 44,804	$ 26,478	$ 84,722	$ 51,746
Other comprehensive income (loss):
Unrealized gains and losses on investment securities AFS	(10,091)	11,199	(7,600)	22,529
Tax effect of unrealized gains and losses on investment securities AFS	3,844	(4,393)	3,157	(8,837)
Reclassification of gains and losses on investment securities AFS included in net income	(85)	(18)	(2,618)	(23)
Tax effect of reclassification of gains and losses on investment securities AFS included in net income	33	7	997	9
Total other comprehensive income (loss)	(6,299)	6,795	(6,064)	13,678
Total comprehensive income	$ 38,505	$ 33,273	$ 78,658	$ 65,424