Quarterly report pursuant to Section 13 or 15(d)

Loans sales and securitizations (Details Textuals)

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Loans sales and securitizations (Details Textuals) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Loans sales and securitizations (Textuals) [Abstract]        
Total servicing income on sold automobile loans $ 300,000 $ 500,000 $ 1,000,000 $ 2,100,000
Total of automobile loans transferred in a securitization transaction 1,000,000,000   1,000,000,000  
Gain or loss from sale of automobile loans in securitizations 15,500,000      
Net proceeds received in securitization transaction 1,000,000,000      
Residential Mortgage [Member]
       
Loans sales and securitizations (Textuals) [Abstract]        
Total servicing fees included in mortgage banking income $ 12,100,000 $ 12,100,000 $ 37,100,000 $ 36,600,000