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Long-term Debt and Short Term Borrowings (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 07, 2015
Dec. 31, 2015
Dec. 31, 2016
Jan. 31, 2016
Loans Receivable [Member]        
Debt Instrument [Line Items]        
Recorded balance loans receivable   $ 3,260,000,000 $ 3,250,000,000  
5.125% Subordinated Notes due June 15, 2017 [Member]        
Debt Instrument [Line Items]        
Repurchased face amount   46,700,000.0   $ 124,700,000.0
Loss on repurchase of debt   $ 1,500,000 $ 4,700,000  
5.75% Subordinated Notes, Due December 15, 2025 [Member]        
Debt Instrument [Line Items]        
Subordinated notes $ 250,000,000      
Proceeds from issuance of debt $ 246,600,000