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 3 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Sep. 30, 2011
Mar. 31, 2013
Residential Mortgage [Member]
Mar. 31, 2012
Residential Mortgage [Member]
Dec. 31, 2012
Residential Mortgage [Member]
Mar. 31, 2013
Automobile Loan [Member]
Mar. 31, 2012
Automobile Loan [Member]
Dec. 31, 2012
Automobile Loan [Member]
Loans sales and securitizations (Textuals) [Abstract]                  
Servicing income       $ 11,200,000 $ 11,800,000   $ 2,700,000 $ 1,200,000  
Total of automobile loans transferred in securitization transactions (not used) 1,000,000,000 1,300,000,000 1,000,000,000            
Unpaid principal balance of third party serviced loans (not used)       $ 15,400,000,000   $ 15,600,000,000 $ 2,300,000,000   $ 2,500,000,000