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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]  
Useful lives used in computing depreciation
Buildings and improvements
 
15 to 50 years
Furniture and equipment
 
3 to 10 years
Key assumptions used in measuring the fair value of MSR
   
2012
  
2011
  
2010
 
           
Constant prepayment rate
  25.58%  19.87%  18.77%
Discount rate
  11.05%  11.06%  11.06%
Weighted average life (years)
  3.41   4.15   4.37