CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ 19,073	$ (24,046)	$ 15,247	$ (67,390)
Available-for-sale debt securities on which an other-than-temporary impairment has been recognized:
Subsequent unrealized gain on debt securities on which an other-than-temporary impairment has been recognized	2,012	1,225	8,309	3,883
Reclassification adjustment for other-than-temporary impairment on debt securities included in net income	(557)	(350)	(1,933)	(957)
All other unrealized gains and losses on available-for-sale securities:
All other unrealized holding gains arising during the period	14,868	15,285	17,009	26,578
Reclassification adjustments for net gain included in net income		(12,504)		(34,453)
Net unrealized gains on securities reclassified from held to maturity to available for sale				2,789
Income tax expense related to items of other comprehensive income	(442)	(2,364)	(92)	(1,631)
Other comprehensive income (loss) for the period, net of tax	15,881	1,292	23,293	(3,791)
Total comprehensive income (loss)	$ 34,954	$ (22,754)	$ 38,540	$ (71,181)