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Quantitative Information about Financial and Nonfinancial Assets (Detail) (Fair Value on a Nonrecurring, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 8,192 $ 12,022
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
OREO
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value   5,914
OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 5,704  
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 3,255  
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
Minimum | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average 2.00%  
Minimum | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average 0.00%  
Maximum | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average 100.00%  
Maximum | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average 100.00%  
Maximum | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average 43.00%  
Average | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average (41.00%)  
Average | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Average (34.00%)  
[1] Fair value is generally based on appraisals of the underlying collateral.
[2] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.