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
Mar. 31, 2012
Mar. 31, 2011
Sep. 30, 2011
2011 Automobile Trust [Member]
Mar. 31, 2012
2012 Automobile Trust [Member]
Mar. 31, 2012
Residential Mortgage [Member]
Mar. 31, 2011
Residential Mortgage [Member]
Loans sales and securitizations (Textuals) [Abstract]            
Total servicing fees included in mortgage banking income         $ 11,800,000 $ 12,500,000
Total servicing income on sold automobile loans 1,200,000 400,000        
Total of automobile loans transferred in a securitization transaction     1,000,000,000 1,300,000,000    
Gain or loss from sale of automobile loans in securitizations       23,000,000    
Net proceeds received in securitization transaction       $ 1,300,000,000