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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis)
 6 Months Ended 9 Months Ended
Dec. 31, 2013
Sep. 30, 2014
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% 2.00%
Minimum | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 0.00% 10.00%
Minimum | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 4.00% 10.00%
Maximum | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 100.00% 34.00%
Maximum | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 65.00% 58.00%
Maximum | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 70.00% 52.00%
Average | Impaired Loans
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 47.00% 21.00%
Average | OREO | Not covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 34.00% 33.00%
Average | OREO | Covered by loss share agreements
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 41.00% 44.00%
[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.