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, 2013
Mar. 31, 2013
Sep. 30, 2012
Dec. 31, 2013
Residential Mortgage [Member]
Dec. 31, 2012
Residential Mortgage [Member]
Dec. 31, 2011
Residential Mortgage [Member]
Dec. 31, 2013
Automobile Loan [Member]
Dec. 31, 2012
Automobile Loan [Member]
Dec. 31, 2011
Automobile Loan [Member]
Dec. 31, 2013
Small Business Association (SBA) Loan [Member]
Dec. 31, 2012
Small Business Association (SBA) Loan [Member]
Dec. 31, 2011
Small Business Association (SBA) Loan [Member]
Loans sales and securitizations (Textuals) [Abstract]                        
Servicing income       $ 43,800,000 $ 46,200,000 $ 49,100,000 $ 10,300,000 $ 8,700,000 $ 2,000,000 $ 6,300,000 $ 5,700,000 $ 4,900,000
Total loans transferred in securitization transactions             0 2,300,018,000 1,020,146,000      
Gain or loss from sale of loans in securitizations and sales             0 42,251,000 15,454,000      
Unpaid principal balance of third party serviced loans                   885,400,000 758,300,000 555,500,000
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)       $ 15,200,000,000 $ 15,600,000,000 $ 15,900,000,000 $ 1,600,000,000 $ 2,500,000,000 $ 900,000,000