Annual report pursuant to Section 13 and 15(d)

Loans sales and securitizations (Details Textuals)

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Loans sales and securitizations (Details Textuals) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Dec. 31, 2012
Residential Mortgage [Member]
Dec. 31, 2011
Residential Mortgage [Member]
Dec. 31, 2010
Residential Mortgage [Member]
Dec. 31, 2012
Automobile Loan [Member]
Dec. 31, 2011
Automobile Loan [Member]
Dec. 31, 2010
Automobile Loan [Member]
Loans sales and securitizations (Textuals) [Abstract]                  
Total servicing fees included in mortgage banking income       $ 46,200,000 $ 49,100,000 $ 48,100,000      
Total servicing income on sold automobile loans             8,700,000 2,000,000 2,500,000
Total of automobile loans transferred in securitization transactions 1,000,000,000 1,300,000,000 1,000,000,000       2,300,000,000    
Gain or loss from sale of automobile loans in securitizations and sales             42,300,000    
Net proceeds received in securitization transaction             2,400,000,000    
Unpaid principal balance of third party serviced loans       15,600,000,000 15,900,000,000 15,900,000,000 2,500,000,000 900,000,000 100,000,000
Total of automobile loans sold, but not securitized             $ 200,000,000