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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis)
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
Minimum | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 3.00% 6.00%
Minimum | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 4.00% 0.00%
Minimum | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 10.00% 4.00%
Maximum | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 100.00% 100.00%
Maximum | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 50.00% 65.00%
Maximum | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 43.00% 70.00%
Average | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 25.00% 47.00%
Average | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 32.00% 34.00%
Average | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 42.00% 41.00%
[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.