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
Mar. 31, 2013
Mar. 31, 2012
Summarize the changes in MSRs using the fair value method    
Fair value, beginning of period $ 35,202 $ 65,001
Change in fair value during the period due to:    
Time decay 609 [1] 856 [1]
Payoffs 3,157 [2] 4,039 [2]
Changes in valuation inputs or assumptions 4,146 [3] 2,348 [3]
Fair value, end of period 35,582 62,454
Residential Mortgage [Member]
    
Summarizes activity relating to residential mortgage loans sold with servicing retained    
Residential mortgage loans sold with servicing retained 836,134 1,006,084
Pretax gains resulting from above loan sales $ 35,569 [4] $ 28,941 [4]
Residential Mortgage [Member] | Fair value method
    
Change in fair value during the period due to:    
Weighted-average life (in years) 3 years 7 months 0 days 3 years 3 months 0 days
Residential Mortgage [Member] | Amortization method
    
Change in fair value during the period due to:    
Weighted-average life (in years) 4 years 7 months 0 days 3 years 8 months 0 days
Automobile Loan [Member] | Amortization method
    
Change in fair value during the period due to:    
Weighted-average life (in years) 4 years 1 month 0 days 4 years 8 months 0 days
[1] Represents decrease in value due to passage of time, including the impact from both regularly scheduled loan principal payments and partial loan paydowns.
[2] Represents decrease in value associated with loans that paid off during the period.
[3] Represents change in value resulting primarily from market-driven changes in interest rates and prepayment spreads.
[4] Recorded in mortgage banking income.