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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Mortgage servicing rights:    
Servicing Asset at Amortized Cost, Beginning Balance $ 75,855 $ 84,209
Additions 18,669 17,476
Amortization (17,326) (25,830)
Other-than-temporary impairment (14,610) 0
Servicing Asset at Amortized Cost, Ending Balance 62,588 75,855
Valuation allowance at beginning of period (27,703) (20,300)
Additions, net (4,477) (7,403)
Other-than-temporary impairment 14,610 0
Valuation allowance at end of period (17,570) (27,703)
Mortgage servicing rights, net 45,018 48,152
Fair value of mortgage servicing rights 45,018 48,152
Portfolio of residential mortgage loans serviced for others ("servicing portfolio") 7,547,000 7,321,000
Mortgage servicing rights, net to servicing portfolio 0.60% 0.66%
Mortgage servicing rights expense (1) $ 21,803 [1] $ 33,233 [1]
[1] (1)        Includes the amortization of mortgage servicing rights and additions/recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income.