Annual report pursuant to Section 13 and 15(d)

Loans sales and securitizations (Details)

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Loans sales and securitizations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summarizes activity relating to residential mortgage loans sold with servicing retained      
Residential mortgage loans sold with servicing retained $ 3,954,762 $ 3,078,475 $ 3,943,830
Pretax gains resulting from above loan sales 128,408 [1] 77,591 [1] 106,495 [1]
Summarize the changes in MSRs using the fair value method      
Fair value, beginning of period 65,001 125,679  
Change in fair value during the period due to:      
Time decay (2,881) [2] (4,966) [2]  
Payoffs (14,389) [3] (19,464) [3]  
Changes in valuation inputs or assumptions (12,529) [4] (36,248) [4]  
Fair value, end of period $ 35,202 $ 65,001 $ 125,679
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 3 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 5 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 8 months 0 days  
[1] Recorded in mortgage banking income.
[2] Represents decrease in value due to passage of time, including the impact from both regularly scheduled loan principal payments and partial loan paydowns.
[3] Represents decrease in value associated with loans that paid off during the period.
[4] Represents change in value resulting primarily from market-driven changes in interest rates and prepayment spreads.