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Summary of Business and Financial Statement Presentation including Significant Accounting Policies (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Derivative Instruments  
Derivative liabilities $ 5.4us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Mortgage Loans Held-for-Sale  
Maximum past due period of principal or interest based on LHFS are placed on nonaccrual status 90 days