Securites Part 4 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 74,019	$ 73,347	$ 74,019	$ 73,347	$ 72,915	$ 76,131	$ 62,047	$ 52,624
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	0	2,294	248	2,331
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	1,104	9,006	5,436	18,392
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	$ 0	$ 0	$ (7,796)	$ 0