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
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Loans sales and securitizations (Textuals) [Abstract]                
Total of automobile loans transferred in securitization transactions     $ 800,000,000 $ 1,300,000,000 $ 1,000,000,000      
Residential Mortgage [Member]                
Loans sales and securitizations (Textuals) [Abstract]                
Servicing income $ 3,700,000 $ 4,900,000       $ 7,600,000 $ 9,900,000  
Unpaid principal balance of third party serviced loans 15,700,000,000         15,700,000,000   $ 15,600,000,000
Automobile Loan [Member]                
Loans sales and securitizations (Textuals) [Abstract]                
Servicing income 1,400,000 2,000,000       2,800,000 4,100,000  
Unpaid principal balance of third party serviced loans 1,300,000,000         1,300,000,000   800,000,000
Automobile Loan [Member] | 2015-1 Automobile Trust [Member]                
Loans sales and securitizations (Textuals) [Abstract]                
Gain or loss from sale of loans in securitizations and sales 5,500,000              
Net proceeds received a loan securitization or sale transaction 780,100,000              
Total servicing assets recorded resulting from securitizations and sales during the current year 11,200,000              
Total of automobile loans transferred in securitization transactions 750,000,000              
Small Business Association (SBA) Loan [Member]                
Loans sales and securitizations (Textuals) [Abstract]                
Servicing income 2,100,000 $ 1,800,000       4,100,000 $ 3,600,000  
Unpaid principal balance of third party serviced loans $ 929,400,000         $ 929,400,000   $ 898,000,000