Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 29,323	$ (48,527)	$ 60,141	$ (34,270)
Unrealized holding gains:
Before tax	6,211	4,065	5,359	5,555
Tax effect	(1,993)	(1,574)	(2,151)	(2,123)
Net of tax	4,218	2,491	3,208	3,432
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	33,801	(217)	34,017	(1,009)
Reclassification of net gains (losses) included in net income:
Tax effect	(13,825)	89	(13,913)	413
Net of tax	19,976	(128)	20,104	(596)
Net unrealized holding (losses) gains	(15,758)	2,619	(16,896)	4,028
Unrealized holding gains:
Before tax	0	0	10,997	0
Tax effect	0	0	(4,498)	0
Net of tax	0	0	6,499	0
Total other comprehensive (loss) income	(15,758)	2,619	(10,397)	4,028
Total comprehensive income (loss)	$ 13,565	$ (45,908)	$ 49,744	$ (30,242)