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Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Guarantor Obligations [Line Items]  
Letters of credit, accrued liability $ 15.2
Reserve for unfunded lending commitments 12.0
Deferred commitment fees 3.2
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