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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Total TDRs $ 14,411 $ 15,875
Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Impaired [Line Items]    
Total TDRs   63
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 1,115 1,119
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 375 1,380
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 5,618 6,661
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 210 360
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 7,093 6,292
Nonaccrual
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 2,200 [1] 3,828 [1]
Nonaccrual | Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Impaired [Line Items]    
Total TDRs   63 [1]
Nonaccrual | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 1,115 [1] 1,119 [1]
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 375 [1] 1,380 [1]
Nonaccrual | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 128 [1] 764 [1]
Nonaccrual | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 159 [1] 305 [1]
Nonaccrual | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 423 [1] 197 [1]
Accrual
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 12,211 12,047
Accrual | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 5,490 5,897
Accrual | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 51 55
Accrual | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs $ 6,670 $ 6,095
[1] TDRs on nonaccrual status are included in the total nonaccrual loan balance disclosed in the table above.