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Fair Values of Assets and Liabilities (Details)
Jun. 30, 2012
Maximum [Member] | Residential Prime Non-Agency Mortgage-Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 23.00%
Lifetime probability of default rates 14.00%
Lifetime loss severity rates 80.00%
Discount margin 30.00%
Maximum [Member] | Residential Non-Prime Non-Agency Mortgage-Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 13.00%
Lifetime probability of default rates 20.00%
Lifetime loss severity rates 88.00%
Discount margin 40.00%
Maximum [Member] | Commercial Non-Agency Mortgage Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 8.00%
Lifetime probability of default rates 14.00%
Lifetime loss severity rates 100.00%
Discount margin 15.00%
Maximum [Member] | Collateralized Debt/Loan Obligations [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 16.00%
Lifetime probability of default rates 28.00%
Lifetime loss severity rates 90.00%
Discount margin 70.00%
Maximum [Member] | Other [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 10.00%
Lifetime probability of default rates 38.00%
Lifetime loss severity rates 100.00%
Discount margin 40.00%
Minimum [Member] | Residential Prime Non-Agency Mortgage-Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 3.00%
Lifetime loss severity rates 9.00%
Discount margin 3.00%
Minimum [Member] | Residential Non-Prime Non-Agency Mortgage-Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 2.00%
Lifetime probability of default rates 2.00%
Lifetime loss severity rates 8.00%
Discount margin 3.00%
Minimum [Member] | Commercial Non-Agency Mortgage Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Lifetime probability of default rates 5.00%
Lifetime loss severity rates 50.00%
Discount margin 2.00%
Minimum [Member] | Collateralized Debt/Loan Obligations [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Lifetime probability of default rates 2.00%
Lifetime loss severity rates 30.00%
Discount margin 2.00%
Minimum [Member] | Other [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 1.00%
Lifetime loss severity rates 40.00%
Discount margin 3.00%
Average [Member] | Residential Prime Non-Agency Mortgage-Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 13.00%
Lifetime probability of default rates 2.00%
Lifetime loss severity rates 40.00%
Discount margin 6.00%
Average [Member] | Residential Non-Prime Non-Agency Mortgage-Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 6.00%
Lifetime probability of default rates 7.00%
Lifetime loss severity rates 54.00%
Discount margin 10.00%
Average [Member] | Commercial Non-Agency Mortgage Backed Securities [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 2.00%
Lifetime probability of default rates 2.00%
Lifetime loss severity rates 60.00%
Discount margin 7.00%
Average [Member] | Collateralized Debt/Loan Obligations [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 4.00%
Lifetime probability of default rates 5.00%
Lifetime loss severity rates 49.00%
Discount margin 12.00%
Average [Member] | Other [Member]
 
Valuation assumption ranges for Level 3 available-for-sale investment securities  
Estimated lifetime prepayment rates 4.00%
Lifetime probability of default rates 14.00%
Lifetime loss severity rates 74.00%
Discount margin 15.00%