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Fair Value of Financial Instruments (Narrative) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 1,160,000,000 $ 1,160,000,000 $ 1,110,000,000
Loans, face value 267,600,000 417,100,000  
Impaired loans 2,400,000 2,400,000  
Specific reserves and other write downs on impaired loans 149,000 149,000  
Troubled debt restructured loans balance   605,000 $ 543,000
Troubled debt restructured loans, specific reserve 43,000 $ 43,000  
Minimum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated Selling Costs   7.00%  
Maximum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated Selling Costs   10.00%  
Walnut Street [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of notes | loan   2  
Walnut Street [Member] | Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior Notes $ 178,200,000 $ 178,200,000  
Debt Instrument, Interest Rate, Stated Percentage 1.50% 1.50%  
Walnut Street [Member] | Junior Subordinated Debt [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Junior Subordinated Notes $ 15,400,000 $ 15,400,000  
Debt Instrument, Interest Rate, Stated Percentage 10.00% 10.00%