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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
Total TDRs $ 15,103 $ 14,411
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 1,115 1,115
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 364 375
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 5,866 5,618
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 50 210
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 7,462 7,093
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 246  
Nonaccrual
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 2,135 [1] 2,200 [1]
Nonaccrual | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 1,115 [1] 1,115 [1]
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 364 [1] 375 [1]
Nonaccrual | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 124 [1] 128 [1]
Nonaccrual | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs   159 [1]
Nonaccrual | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 532 [1] 423 [1]
Accrual
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 12,968 12,211
Accrual | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 5,742 5,490
Accrual | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 50 51
Accrual | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 6,930 6,670
Accrual | Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Impaired [Line Items]    
Total TDRs $ 246  
[1] TDRs on nonaccrual status are included in the total nonaccrual loan balance disclosed in the table above.