Fair Value Measurement Of Assets And Liabilities (Changes In Level 3 Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified		3 Months Ended
	Dec. 31, 2010 Trading Securities [Member]	Mar. 31, 2012 Available For Sale Securities [Member]	Mar. 31, 2011 Available For Sale Securities [Member]		Mar. 31, 2011 Residential Mortgage-Backed Securities [Member] Available For Sale Securities [Member]	Mar. 31, 2011 Trust Preferred Securities [Member] Trading Securities [Member]	Mar. 31, 2011 Trust Preferred Securities [Member] Available For Sale Securities [Member]	Mar. 31, 2011 Corporate And Other Debt Securities [Member] Available For Sale Securities [Member]	Mar. 31, 2011 Equity Securities [Member] Available For Sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of the period	$ 21,903	$ 77,311	$ 138,655
Transfers out of Level 3					(44,771)	(21,903)	(17,397)	(12,914)	(9,353)
Total net losses for the period included in, net income			(825)
Total net losses for the period included in, other comprehensive income		11,107	1,361
Settlements		(3,698)	(2,383)
Balance, end of the period	21,903	84,720	52,373
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period			$ (825)	[1],[2]

[1] Represents net losses that are due to changes in economic conditions and management's estimates of fair value.

[2] Represents the net impairment losses on securities recognized in earnings for the period.