Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 116,073	$ 120,655	$ 133,965
Unrealized (losses) gains on securities:
Change in unrealized holding (losses) gains, net	(13,393)	74,147	(178,500)
Less: Reclassifications adjustment for gains included in net income	(10,402)	(4,127)	(8,542)
Change in unrealized (losses) gains on securities during the period	(23,795)	70,020	(187,042)
Change in unrealized losses on derivative hedges	(10)
Income tax benefit (expense)	9,081	(26,374)	68,814
Other comprehensive (loss) income	(14,724)	43,646	(118,228)
Comprehensive income	$ 101,349	$ 164,301	$ 15,737