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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mortgage servicing rights:    
Servicing Asset at Amortized Cost, Beginning Balance $ 61,425 $ 75,855
Additions 5,902 23,528
Amortization (4,989) (23,348)
Other-than-temporary impairment 0 (14,610)
Servicing Asset at Amortized Cost, Ending Balance 62,338 61,425
Valuation allowance at beginning of period (15,476) (27,703)
Additions, net 5,216 (2,383)
Other-than-temporary impairment 0 14,610
Valuation allowance at end of period (10,260) (15,476)
Mortgage servicing rights, net 52,078 45,949
Fair value of mortgage servicing rights 52,078 45,949
Portfolio of residential mortgage loans serviced for others ("servicing portfolio") 7,585,000 7,453,000
Mortgage servicing rights, net to servicing portfolio 0.69% 0.62%
Mortgage servicing rights expense (1) $ (227) [1] $ 25,731 [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.