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Goodwill (Tables)
3 Months Ended
Mar. 31, 2013
Goodwill [Line Items]  
Key Ratios to Measure Goodwill of Bank Reporting Unit for Impairment
   Annual  
 Ratio May 31, 2012  
 Price to book  1.29x  
 Price to tangible book 1.47x  
Factors Used to Measure Goodwill in Income Approach
  Annual 
 FactorsMay 31, 2012 
 Discount rate17.5% 
 Weighted-average increase in revenues6.0% 
 Weighted-average increase in expenses5.0% 
Key Ratios Used to Measure Goodwill of Property and Casualty Insurance Reporting Unit for Impairment
  Annual 
 RatioMay 31, 2012 
 Average price to book 1.17X 
 Median price to earnings12.1X