Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Guarantees, Commitments And Contingencies [Abstract]
Letters of credit, accrued liability	$ 10.6
Reserve for unfunded lending commitments	7.9
Deferred commitment fees	2.7
Guarantee of trust preferred securities issued by affiliated trusts	15
Commitments for Private Equity and Other Noninterest-bearing Investments	27.8
Range of possible loss, minimum	0
Range of possible loss, maximum	$ 50