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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis)
 12 Months Ended
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 6.00%
Minimum | OREO | Not covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 0.00%
Minimum | OREO | Covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 4.00%
Maximum | Impaired Loans
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 100.00%
Maximum | OREO | Not covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 65.00%
Maximum | OREO | Covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 70.00%
Average | Impaired Loans
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 47.00%
Average | OREO | Not covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 34.00%
Average | OREO | Covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 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.