Quarterly report pursuant to Section 13 or 15(d)

Loans sales and securitizations (Details)

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Loans sales and securitizations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Residential Mortgage [Member]
        
Summarizes activity relating to residential mortgage loans sold with servicing retained        
Residential mortgage loans sold with servicing retained $ 913,994 $ 850,215 $ 1,750,127 $ 1,856,300
Pretax gains resulting from above loan sales 32,727 [1] 24,713 [1] 68,295 [1] 53,654 [1]
Summarize the changes in MSRs using the fair value method        
Fair value, beginning of period 35,582 62,454 35,202 65,001
Change in fair value during the period due to:        
Time decay 625 793 1,234 1,649
Payoffs 3,601 4,253 6,759 8,292
Changes in valuation inputs or assumptions 6,188 (12,347) 10,335 (9,999)
Fair value, end of period $ 37,544 $ 45,061 $ 37,544 $ 45,061
Residential Mortgage [Member] | Fair value method
        
Change in fair value during the period due to:        
Weighted-average life (in years) 3 years 2 months 0 days 3 years 2 months 0 days 3 years 2 months 0 days 3 years 2 months 0 days
Residential Mortgage [Member] | Amortization method
        
Change in fair value during the period due to:        
Weighted-average life (in years) 3 years 4 months 0 days 3 years 4 months 0 days 3 years 4 months 0 days 3 years 4 months 0 days
Automobile Loan [Member] | Amortization method
        
Change in fair value during the period due to:        
Weighted-average life (in years) 4 years 3 months 0 days 4 years 3 months 0 days 4 years 3 months 0 days 4 years 3 months 0 days
[1] Recorded in mortgage banking income.