Guarantees, Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Guarantees, Commitments And Contingencies [Abstract]
Letters of credit, accrued liability	$ 12.6
Reserve for unfunded lending commitments	7.8
Deferred commitment fees	4.8
Guarantee of trust preferred securities issued by affiliated trusts	$ 300.0