Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) [Abstract]
Net income (loss)	$ 6,446	$ (4,122)	$ 14,283	$ (11,486)
Available for sale securities
Unrealized gain arising during period	909	357	2,543	930
Change in unrealized losses for which a portion of other than temporary impairment has been recognized in earnings	770	(220)	1,103	191
Reclassification adjustment for other than temporary impairment included in earnings	70	4	332	146
Reclassification adjustments for (gains) included in earnings	(350)	0	(1,193)	(204)
Unrealized gains recognized in other comprehensive income on available for sale securities	1,399	141	2,785	1,063
Derivative instruments
Unrealized loss arising during period	(54)	(215)	(129)	(478)
Reclassification adjustment for expense recognized in earnings	92	200	397	603
Reclassification adjustment for accretion on settled derivatives	145	145	436	514
Unrealized gains recognized in other comprehensive income on derivative instruments	183	130	704	639
Other comprehensive income (loss), before tax	1,582	271	3,489	1,702
Income tax expense related to components of other comprehensive income (loss)	0	95	0	596
Other comprehensive income	1,582	176	3,489	1,106
Comprehensive income (loss)	$ 8,028	$ (3,946)	$ 17,772	$ (10,380)