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Summary of Significant Accounting Policies - Premises and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Accumulated depreciation and amortization of premises and equipment $ 203.9us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 194.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment