Annual report pursuant to Section 13 and 15(d)

Fair Values of Assets and Liabilities (Details Textuals)

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Fair Values of Assets and Liabilities (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Asset-backed Securities [Member]
Dec. 31, 2010
Level 3 [Member]
Municipal securities [Member]
Dec. 31, 2011
Level 3 [Member]
Automobile Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfer in of Level 3 Assets       $ 323.6 $ 791.4
Transfer out of Level 3 Assets     184.1    
Fair Values of Assets and Liabilities (Textuals) [Abstract]          
Federal Agencies: mortgage-backed securities transferred to held-to-maturity securities portfolio $ 278.2 $ 469.1