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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
Total TDRs $ 15,636 $ 14,411
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
Total TDRs   1,115
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 837 375
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 5,473 5,618
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 48 210
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 9,034 7,093
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 244  
Nonaccrual
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 485 [1] 2,200 [1]
Nonaccrual | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
Total TDRs   1,115 [1]
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs   375 [1]
Nonaccrual | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 103 [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 382 [1] 423 [1]
Accrual
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 15,151 12,211
Accrual | Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 837  
Accrual | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 5,370 5,490
Accrual | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 48 51
Accrual | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Impaired [Line Items]    
Total TDRs 8,652 6,670
Accrual | Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Impaired [Line Items]    
Total TDRs $ 244  
[1] TDRs on nonaccrual status are included in the total nonaccrual loan balance disclosed in the table above.