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Interest Income Recognized on Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]      
Total impaired loans, Interest Income Recognized $ 1,966    
Interest Income
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 821 323 155
Impaired loans with a related allowance, Interest Income Recognized 240 1,453 492
Total impaired loans, Interest Income Recognized 1,061 1,776 647
Interest Income | Commercial Loans | Construction Development And Other Land
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 294 3  
Impaired loans with a related allowance, Interest Income Recognized 117 1 9
Interest Income | Commercial Loans | Commercial and Industrial
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 17 17 4
Impaired loans with a related allowance, Interest Income Recognized 18 948 21
Interest Income | Commercial Loans | Multi-family Residential
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 3 4 24
Impaired loans with a related allowance, Interest Income Recognized 7 3  
Interest Income | Commercial Loans | Single-family Non-owner Occupied
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 99 56 39
Impaired loans with a related allowance, Interest Income Recognized 3 80 107
Interest Income | Commercial Loans | Non-farm, Non-residential
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 296 102 25
Impaired loans with a related allowance, Interest Income Recognized 29 317 191
Interest Income | Commercial Loans | Farmland Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 12    
Interest Income | Consumer Real Estate | Home Equity Lines
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 25 28 15
Impaired loans with a related allowance, Interest Income Recognized 12 1  
Interest Income | Consumer Real Estate | Single Family Owner Occupied
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 70 113 43
Impaired loans with a related allowance, Interest Income Recognized 54 103 164
Interest Income | Consumer Real Estate | Owner occupied construction
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized 5   3
Interest Income | Consumer and Other | Consumer Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Interest Income Recognized     $ 2