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, 2011
Dec. 31, 2010
Dec. 31, 2009
Summarizes activity relating to residential mortgage loans sold with servicing retained      
Residential mortgage loans sold with servicing retained $ 3,078,475 $ 3,943,830 $ 4,307,526
Pretax gains resulting from above loan sales 77,591 [1] 106,495 [1] 87,192 [1]
Summarize the changes in MSRs using the fair value method      
Fair value, beginning of period 125,679 176,427  
Change in fair value during the period due to:      
Time decay (4,966) [2] (5,359) [2]  
Payoffs (19,464) [3] (32,668) [3]  
Changes in valuation inputs or assumptions (36,248) [4] (12,721) [4]  
Fair value, end of period $ 65,001 $ 125,679 $ 176,427
[1] Recorded in noninterest 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.