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Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details)
$ in Millions
Mar. 31, 2016
USD ($)
Guarantor Obligations [Line Items]  
Letters of credit, accrued liability $ 5.1
Reserve for unfunded lending commitments 2.1
Deferred commitment fees 3.0
Guarantee of trust preferred securities issued by affiliated trusts 165.0
Commitments for Private Equity and Other Noninterest-bearing Investments 20.0
Range of possible loss, minimum 0.0
Range of possible loss, maximum $ 60.0