Quarterly report pursuant to Section 13 or 15(d)

Loans sales and securitizations (Details)

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Loans sales and securitizations (Details) (Residential Mortgage [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Residential Mortgage [Member]
        
Summarizes activity relating to residential mortgage loans sold with servicing retained        
Residential mortgage loans sold with servicing retained $ 889,769 $ 515,179 $ 2,746,068 $ 2,264,697
Pretax gains resulting from above loan sales 30,195 [1] 12,737 [1] 83,849 [1] 57,982 [1]
Summarize the changes in MSRs using the fair value method        
Fair value, beginning of period 45,061 104,997 65,001 125,679
Change in fair value during the period due to:        
Time decay (633) [2] (1,222) [2] (2,282) [2] (3,987) [2]
Payoffs (3,043) [3] (4,614) [3] (11,334) [3] (15,013) [3]
Changes in valuation inputs or assumptions (4,764) [4] (25,337) [4] (14,764) [4] (32,855) [4]
Fair value, end of period $ 36,621 $ 73,824 $ 36,621 $ 73,824
[1] Recorded in other 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.