Quarterly report pursuant to Section 13 or 15(d)

Loans sales and securitizations (Details)

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Loans sales and securitizations (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Residential Mortgage [Member]
       
Summarizes activity relating to loans sold securitized with servicing retained        
Loans sold with servicing retained $ 654,747,000 $ 853,287,000 $ 1,703,056,000 $ 2,603,414,000
Pretax gains resulting from above loan sales 16,781,000 [1] 23,224,000 [1] 43,853,000 [1] 91,519,000 [1]
Summarize the changes in MSRs using the fair value method        
Fair value, beginning of period 26,747,000 37,544,000 34,236,000 35,202,000
Change in fair value during the period due to:        
Time decay 467,000 727,000 1,848,000 1,961,000
Payoffs 1,343,000 3,015,000 4,869,000 9,774,000
Changes in valuation inputs or assumptions 501,000 304,000 (2,081,000) 10,639,000
Fair value, end of period 25,438,000 34,106,000 25,438,000 34,106,000
Residential Mortgage [Member] | Fair value method
       
Change in fair value during the period due to:        
Weighted-average life (in years) 5 years 2 months 0 days 4 years 2 months 0 days 5 years 2 months 0 days 4 years 2 months 0 days
Residential Mortgage [Member] | Amortization method
       
Change in fair value during the period due to:        
Weighted-average life (in years) 6 years 10 months 0 days 6 years 5 months 0 days 6 years 10 months 0 days 6 years 5 months 0 days
Automobile Loan [Member] | Amortization method
       
Change in fair value during the period due to:        
Weighted-average life (in years) 3 years 0 months 0 days 3 years 10 months 0 days 3 years 0 months 0 days 3 years 10 months 0 days
Small Business Association (SBA) Loan [Member]
       
Summarizes activity relating to loans sold securitized with servicing retained        
Loans sold with servicing retained 63,470,000 49,808,000 149,571,000 116,094,000
Pretax gains resulting from above loan sales $ 7,432,000 [1] $ 4,718,000 [1] $ 17,204,000 [1] $ 12,059,000 [1]
Change in fair value during the period due to:        
Weighted-average life (in years) 3 years 6 months 0 days      
[1]
Recorded in mortgage banking income.