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Aging of Past Due Loans by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due $ 14,090 $ 9,351
60 - 89 Days Past Due 3,906 3,626
90+ Days Past Due 11,142 13,935
Total Past Due 29,138 26,912
Current Loans 1,476,460 1,369,155
Total Loans 1,505,598 1,396,067
Commercial Loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 821,514 712,040
Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 344 253
90+ Days Past Due 188 987
Total Past Due 532 1,240
Current Loans 48,928 60,528
Total Loans 49,460 61,768
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 387 150
60 - 89 Days Past Due 84 30
90+ Days Past Due 1,432 3,568
Total Past Due 1,903 3,748
Current Loans 86,811 88,191
Total Loans 88,714 91,939
Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 624 667
90+ Days Past Due   342
Total Past Due 624 1,009
Current Loans 65,070 76,041
Total Loans 65,694 77,050
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,841 1,222
60 - 89 Days Past Due 1,348 414
90+ Days Past Due 3,715 1,020
Total Past Due 6,904 2,656
Current Loans 128,743 104,087
Total Loans 135,647 106,743
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 2,702 837
60 - 89 Days Past Due 936 860
90+ Days Past Due 3,621 2,180
Total Past Due 7,259 3,877
Current Loans 438,630 332,128
Total Loans 445,889 336,005
Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
60 - 89 Days Past Due   7
Total Past Due   7
Current Loans 1,709 1,367
Total Loans 1,709 1,374
Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 216 152
60 - 89 Days Past Due 196  
90+ Days Past Due   258
Total Past Due 412 410
Current Loans 33,989 36,751
Total Loans 34,401 37,161
Consumer Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 600,255 604,031
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 315 642
60 - 89 Days Past Due 93 222
90+ Days Past Due 495 235
Total Past Due 903 1,099
Current Loans 110,178 110,288
Total Loans 111,081 111,387
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 6,564 5,230
60 - 89 Days Past Due 1,176 1,993
90+ Days Past Due 1,644 5,333
Total Past Due 9,384 12,556
Current Loans 463,567 460,511
Total Loans 472,951 473,067
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 382  
60 - 89 Days Past Due   29
Total Past Due 382 29
Current Loans 15,841 19,548
Total Loans 16,223 19,577
Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 715 198
60 - 89 Days Past Due 73 71
90+ Days Past Due 47 12
Total Past Due 835 281
Current Loans 77,328 66,848
Total Loans 78,163 67,129
Consumer and Other | Other
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 5,666 12,867
Total Loans 5,666 12,867
Covered Loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,442  
60 - 89 Days Past Due 408  
90+ Days Past Due 2,807  
Total Past Due 4,657  
Current Loans 214,398  
Total Loans 219,055  
Covered Loans | Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 252  
60 - 89 Days Past Due 161  
90+ Days Past Due 1,121  
Total Past Due 1,534  
Current Loans 33,035  
Total Loans 34,569  
Covered Loans | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 45  
Total Past Due 45  
Current Loans 6,927  
Total Loans 6,972  
Covered Loans | Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,611  
Total Loans 2,611  
Covered Loans | Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 8  
90+ Days Past Due 21  
Total Past Due 29  
Current Loans 11,664  
Total Loans 11,693  
Covered Loans | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 501  
90+ Days Past Due 927  
Total Past Due 1,428  
Current Loans 50,058  
Total Loans 51,486  
Covered Loans | Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 144  
Total Loans 144  
Covered Loans | Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 6  
Total Past Due 6  
Current Loans 1,254  
Total Loans 1,260  
Covered Loans | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 217  
60 - 89 Days Past Due 112  
90+ Days Past Due 204  
Total Past Due 533  
Current Loans 80,912  
Total Loans 81,445  
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 413  
60 - 89 Days Past Due 135  
90+ Days Past Due 475  
Total Past Due 1,023  
Current Loans 22,534  
Total Loans 23,557  
Covered Loans | Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
90+ Days Past Due 59  
Total Past Due 59  
Current Loans 1,585  
Total Loans 1,644  
Covered Loans | Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 3,674  
Total Loans $ 3,674