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Valuation Assumption Ranges for MSRs (Detail)
Sep. 30, 2012
Dec. 31, 2011
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 22.20% 21.30%
Discount rate 10.40% 10.40%
Minimum
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 14.00%  
Discount rate 10.00%  
Maximum
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 35.00%  
Discount rate 14.00%  
Average
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 22.00%  
Discount rate 10.00%