Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) $ in Millions	Jun. 30, 2015 USD ($)
Guarantor Obligations [Line Items]
Letters of credit, accrued liability	$ 14.7
Reserve for unfunded lending commitments	11.9
Deferred commitment fees	2.8
Guarantee of trust preferred securities issued by affiliated trusts	15.0
Commitments for Private Equity and Other Noninterest-bearing Investments	48.0
Range of possible loss, minimum	0.0
Range of possible loss, maximum	$ 50.0