Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 24,555	$ 34,450	$ 9,834
Other comprehensive loss before tax:
Unrealized gain (loss) on securities available-for-sale	63,152	60,287	127,144
Realized (gain) loss on investment securities included in net income	(74,210)	(27,996)	(15,032)
Total loss on other than temporary impaired securities	0	(15,018)	(39,674)
Portion of loss on securities recognized in OCI	0	0	(22,508)
Unrealized gain (loss) on cash flow hedges	(7,702)	(47,425)	0
Realized loss on cash flow hedges included in net income	37,463	0	0
Other comprehensive loss before taxes	18,703	(116)	129,278
Income tax effect	46	260	(9,552)
Total	18,749	144	119,726
Comprehensive income (loss)	$ 43,304	$ 34,594	$ 129,560