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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Residential Mortgage [Member]
        
Summarizes activity relating to residential mortgage loans sold with servicing retained        
Residential mortgage loans sold with servicing retained $ 850,215 $ 492,015 $ 1,856,300 $ 1,749,518
Pretax gains resulting from above loan sales 24,713 [1] 12,565 [1] 53,654 [1] 45,244 [1]
Summarize the changes in MSRs using the fair value method        
Fair value, beginning of period 62,454 119,207 65,001 125,679
Change in fair value during the period due to:        
Time decay (793) [2] (1,390) [2] (1,649) [2] (2,764) [2]
Payoffs (4,253) [3] (4,528) [3] (8,292) [3] (10,400) [3]
Changes in valuation inputs or assumptions (12,347) [4] (8,292) [4] (9,999) [4] (7,518) [4]
Fair value, end of period $ 45,061 $ 104,997 $ 45,061 $ 104,997
[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.