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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value on Nonrecurring Basis
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique [1] Discounted appraisals  
Unobservable Input [2] Appraisal adjustments  
OREO | Non Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique [1] Discounted appraisals  
Unobservable Input [2] Appraisal adjustments  
OREO | Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique [1] Discounted appraisals  
Unobservable Input [2] Appraisal adjustments  
Minimum | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 0.00% 1.00%
Minimum | OREO | Non Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 10.00% 10.00%
Minimum | OREO | Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 11.00% 10.00%
Maximum | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 66.00% 33.00%
Maximum | OREO | Non Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 60.00% 47.00%
Maximum | OREO | Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 46.00% 52.00%
Average | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 25.00% 22.00%
Average | OREO | Non Covered Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 21.00% 26.00%
Average | OREO | Covered Loans    
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.