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Aging of Past Due Loans by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due $ 7,647 $ 14,090
60 - 89 Days Past Due 1,700 3,906
90+ Days Past Due 15,051 11,142
Total Past Due 24,398 29,138
Current Loans 1,508,874 1,488,409
Total Loans 1,533,272 1,517,547
Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 130 344
60 - 89 Days Past Due 156  
90+ Days Past Due 4,929 188
Total Past Due 5,215 532
Current Loans 50,576 56,902
Total Loans 55,791 57,434
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 438 387
60 - 89 Days Past Due 142 84
90+ Days Past Due 1,221 1,432
Total Past Due 1,801 1,903
Current Loans 94,171 86,835
Total Loans 95,972 88,738
Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 100 624
Total Past Due 100 624
Current Loans 55,979 65,070
Total Loans 56,079 65,694
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 959 1,841
60 - 89 Days Past Due 268 1,348
90+ Days Past Due 1,129 3,715
Total Past Due 2,356 6,904
Current Loans 129,897 129,008
Total Loans 132,253 135,912
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,524 2,702
60 - 89 Days Past Due 231 936
90+ Days Past Due 4,332 3,621
Total Past Due 6,087 7,259
Current Loans 449,160 441,551
Total Loans 455,247 448,810
Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,274 1,709
Total Loans 2,274 1,709
Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   216
60 - 89 Days Past Due   196
90+ Days Past Due 437  
Total Past Due 437 412
Current Loans 31,448 34,158
Total Loans 31,885 34,570
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 433 315
60 - 89 Days Past Due 101 93
90+ Days Past Due 847 495
Total Past Due 1,381 903
Current Loans 108,230 110,178
Total Loans 109,611 111,081
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 3,512 6,564
60 - 89 Days Past Due 713 1,176
90+ Days Past Due 1,998 1,644
Total Past Due 6,223 9,384
Current Loans 486,201 464,163
Total Loans 492,424 473,547
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 79 382
Total Past Due 79 382
Current Loans 25,270 15,841
Total Loans 25,349 16,223
Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 472 715
60 - 89 Days Past Due 89 73
90+ Days Past Due 158 47
Total Past Due 719 835
Current Loans 70,960 77,328
Total Loans 71,679 78,163
Consumer and Other | Other
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 4,708 5,666
Total Loans 4,708 5,666
Covered Loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,191 1,442
60 - 89 Days Past Due 146 408
90+ Days Past Due 2,523 2,807
Total Past Due 3,860 4,657
Current Loans 159,565 202,449
Total Loans 163,425 207,106
Covered Loans | Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 34 252
60 - 89 Days Past Due 59 161
90+ Days Past Due 159 1,121
Total Past Due 252 1,534
Current Loans 17,727 25,061
Total Loans 17,979 26,595
Covered Loans | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 30 45
60 - 89 Days Past Due 58  
90+ Days Past Due 37  
Total Past Due 125 45
Current Loans 3,826 6,903
Total Loans 3,951 6,948
Covered Loans | Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,003 2,611
Total Loans 2,003 2,611
Covered Loans | Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 72 8
90+ Days Past Due 119 21
Total Past Due 191 29
Current Loans 7,951 11,399
Total Loans 8,142 11,428
Covered Loans | Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 144 501
90+ Days Past Due 267 927
Total Past Due 411 1,428
Current Loans 37,340 47,137
Total Loans 37,751 48,565
Covered Loans | Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 176 144
Total Loans 176 144
Covered Loans | Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   6
90+ Days Past Due 304  
Total Past Due 304 6
Current Loans 710 1,085
Total Loans 1,014 1,091
Covered Loans | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 400 217
60 - 89 Days Past Due 10 112
90+ Days Past Due 165 204
Total Past Due 575 533
Current Loans 71,149 80,912
Total Loans 71,724 81,445
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 390 413
60 - 89 Days Past Due   135
90+ Days Past Due 1,352 475
Total Past Due 1,742 1,023
Current Loans 17,511 21,938
Total Loans 19,253 22,961
Covered Loans | Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 121  
60 - 89 Days Past Due 19  
90+ Days Past Due 120 59
Total Past Due 260 59
Current Loans 1,046 1,585
Total Loans 1,306 1,644
Covered Loans | Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 126 3,674
Total Loans $ 126 $ 3,674