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Aging of Past Due Loans by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due $ 11,276 $ 14,090
60 - 89 Days Past Due 5,891 3,906
90+ Days Past Due 15,295 11,142
Total Past Due 32,462 29,138
Current Loans 1,461,770 1,488,409
Total Loans 1,494,232 1,517,547
Commercial Loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 823,422 832,867
Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 301 344
60 - 89 Days Past Due 1,413  
90+ Days Past Due 5,275 188
Total Past Due 6,989 532
Current Loans 48,231 56,902
Total Loans 55,220 57,434
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 258 387
60 - 89 Days Past Due 55 84
90+ Days Past Due 1,549 1,432
Total Past Due 1,862 1,903
Current Loans 89,804 86,835
Total Loans 91,666 88,738
Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 37 624
90+ Days Past Due 70  
Total Past Due 107 624
Current Loans 63,822 65,070
Total Loans 63,929 65,694
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 258 1,841
60 - 89 Days Past Due 107 1,348
90+ Days Past Due 2,332 3,715
Total Past Due 2,697 6,904
Current Loans 133,637 129,008
Total Loans 136,334 135,912
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 2,394 2,702
60 - 89 Days Past Due 1,245 936
90+ Days Past Due 3,540 3,621
Total Past Due 7,179 7,259
Current Loans 433,047 441,551
Total Loans 440,226 448,810
Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
90+ Days Past Due 17  
Total Past Due 17  
Current Loans 2,100 1,709
Total Loans 2,117 1,709
Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 42 216
60 - 89 Days Past Due   196
90+ Days Past Due 177  
Total Past Due 219 412
Current Loans 33,711 34,158
Total Loans 33,930 34,570
Consumer Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 598,582 600,851
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 968 315
60 - 89 Days Past Due 745 93
90+ Days Past Due 623 495
Total Past Due 2,336 903
Current Loans 106,049 110,178
Total Loans 108,385 111,081
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 6,837 6,564
60 - 89 Days Past Due 1,113 1,176
90+ Days Past Due 1,654 1,644
Total Past Due 9,604 9,384
Current Loans 460,833 464,163
Total Loans 470,437 473,547
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   382
Total Past Due   382
Current Loans 19,760 15,841
Total Loans 19,760 16,223
Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 181 715
60 - 89 Days Past Due 1,213 73
90+ Days Past Due 58 47
Total Past Due 1,452 835
Current Loans 67,173 77,328
Total Loans 68,625 78,163
Consumer and Other | Other
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 3,603 5,666
Total Loans 3,603 5,666
Covered Loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,093 1,442
60 - 89 Days Past Due 622 408
90+ Days Past Due 2,561 2,807
Total Past Due 4,276 4,657
Current Loans 190,784 202,449
Total Loans 195,060 207,106
Covered Loans | Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 152 252
60 - 89 Days Past Due 155 161
90+ Days Past Due 1,121 1,121
Total Past Due 1,428 1,534
Current Loans 23,067 25,061
Total Loans 24,495 26,595
Covered Loans | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 147 45
90+ Days Past Due 33  
Total Past Due 180 45
Current Loans 5,025 6,903
Total Loans 5,205 6,948
Covered Loans | Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,549 2,611
Total Loans 2,549 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 29 21
Total Past Due 29 29
Current Loans 10,643 11,399
Total Loans 10,672 11,428
Covered Loans | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 22 501
60 - 89 Days Past Due 38  
90+ Days Past Due 562 927
Total Past Due 622 1,428
Current Loans 42,235 47,137
Total Loans 42,857 48,565
Covered Loans | Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 128 144
Total Loans 128 144
Covered Loans | Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 22 6
Total Past Due 22 6
Current Loans 1,200 1,085
Total Loans 1,222 1,091
Covered Loans | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 194 217
60 - 89 Days Past Due 165 112
90+ Days Past Due 180 204
Total Past Due 539 533
Current Loans 79,924 80,912
Total Loans 80,463 81,445
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 437 413
60 - 89 Days Past Due 264 135
90+ Days Past Due 577 475
Total Past Due 1,278 1,023
Current Loans 21,764 21,938
Total Loans 23,042 22,961
Covered Loans | Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 119  
90+ Days Past Due 59 59
Total Past Due 178 59
Current Loans 1,450 1,585
Total Loans 1,628 1,644
Covered Loans | Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,799 3,674
Total Loans $ 2,799 $ 3,674