Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended		3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Total Return Swap [Member]	Dec. 31, 2011 Total Return Swap [Member]	Jul. 28, 2010 Interest Rate Swaps [Member] Total Return Swap [Member]
Derivative [Line Items]
Fair values of derivative assets reduced (increased) by net credit valuation adjustments	$ 3,500,000	$ 2,700,000
Fair values of derivative liabilities reduced (increased) by net credit valuation adjustments	(100,000)	(100,000)
Derivative asset, fair value, amount offset against collateral	0	0
Derivative liability, fair value, amount offset against collateral	2,100,000	1,900,000
Notional amount of bank and insurance trust preferred CDOs					1,160,000,000
Estimated amounts in AOCI to be reclassified to interest income	9,000,000
Fair value of the TRS derivative liability			5,200,000	5,400,000
Expected net quarterly costs			$ 5,300,000