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Quantitative Information about Financial and Nonfinancial Assets (Detail) (Fair Value on a Nonrecurring, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Impaired Loans
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value $ 7,743
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]  
Fair Value 2,870
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 $ 3,938
Valuation Technique Discounted appraisals [1]
Unobservable Input Appraisal adjustments [2]
Minimum | Impaired Loans
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 2.00%
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 0.00%
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 96.00%
Maximum | OREO | Covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average 39.00%
Average | Impaired Loans
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average (42.00%)
Average | OREO | Not covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average (61.00%)
Average | OREO | Covered by loss share agreements
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average (26.00%)
[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.