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 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2011
2011 Automobile Trust [Member]
Mar. 31, 2012
2012 Automobile Trust [Member]
Jun. 30, 2012
Residential Mortgage [Member]
Jun. 30, 2011
Residential Mortgage [Member]
Jun. 30, 2012
Residential Mortgage [Member]
Jun. 30, 2011
Residential Mortgage [Member]
Loans sales and securitizations (Textuals) [Abstract]                    
Total servicing fees included in mortgage banking income             $ 11,600,000 $ 12,400,000 $ 23,400,000 $ 25,000,000
Total servicing income on sold automobile loans 2,100,000 300,000 3,300,000 700,000            
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        
Total automobile loans transferred to held for sale for securitization $ 1,300,000,000   $ 1,300,000,000