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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis)
 3 Months Ended
Mar. 31, 2014
Impaired Loans
Mar. 31, 2014
OREO
Not covered by loss share agreements
Mar. 31, 2014
OREO
Covered by loss share agreements
Mar. 31, 2014
Minimum
Impaired Loans
Dec. 31, 2013
Minimum
Impaired Loans
Mar. 31, 2014
Minimum
OREO
Not covered by loss share agreements
Dec. 31, 2013
Minimum
OREO
Not covered by loss share agreements
Mar. 31, 2014
Minimum
OREO
Covered by loss share agreements
Dec. 31, 2013
Minimum
OREO
Covered by loss share agreements
Mar. 31, 2014
Maximum
Impaired Loans
Dec. 31, 2013
Maximum
Impaired Loans
Mar. 31, 2014
Maximum
OREO
Not covered by loss share agreements
Dec. 31, 2013
Maximum
OREO
Not covered by loss share agreements
Mar. 31, 2014
Maximum
OREO
Covered by loss share agreements
Dec. 31, 2013
Maximum
OREO
Covered by loss share agreements
Mar. 31, 2014
Average
Impaired Loans
Dec. 31, 2013
Average
Impaired Loans
Mar. 31, 2014
Average
OREO
Not covered by loss share agreements
Dec. 31, 2013
Average
OREO
Not covered by loss share agreements
Mar. 31, 2014
Average
OREO
Covered by loss share agreements
Dec. 31, 2013
Average
OREO
Covered by loss share agreements
Fair Value Inputs, Assets, Quantitative Information [Line Items]                                          
Valuation Technique Discounted appraisals [1] Discounted appraisals [1] Discounted appraisals [1]                                    
Unobservable Input Appraisal adjustments [2] Appraisal adjustments [2] Appraisal adjustments [2]                                    
Weighted Average       4.00% 6.00% 30.00% 0.00% 17.00% 4.00% 100.00% 100.00% 74.00% 65.00% 43.00% 70.00% 14.00% 47.00% 33.00% 34.00% 43.00% 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.