Consolidated Statements Of Comprehensive Income (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	$ 30,598	$ 11,328	$ 364,775	$ 24,300
Other comprehensive income (loss):
Change in unrealized gains on investments and MBS available-for-sale	16,235	39,564	28,547	78,158
Realized net gains reclassified from other comprehensive income	(3,129)	0	(5,773)	(14,298)
Less deferred income tax provision	(4,945)	0	(8,626)	(2,384)
Net other comprehensive income (loss)	8,161	39,564	14,148	61,476
Comprehensive income	$ 38,759	$ 50,892	$ 378,923	$ 85,776