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Aging of Past Due Loans by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due $ 7,971 $ 14,090
60 - 89 Days Past Due 2,444 3,906
90+ Days Past Due 14,982 11,142
Total Past Due 25,397 29,138
Current Loans 1,482,025 1,488,409
Total Loans 1,507,422 1,517,547
Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 322 344
60 - 89 Days Past Due 194  
90+ Days Past Due 4,964 188
Total Past Due 5,480 532
Current Loans 46,718 56,902
Total Loans 52,198 57,434
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 228 387
60 - 89 Days Past Due 37 84
90+ Days Past Due 1,280 1,432
Total Past Due 1,545 1,903
Current Loans 90,903 86,835
Total Loans 92,448 88,738
Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   624
90+ Days Past Due 20  
Total Past Due 20 624
Current Loans 59,516 65,070
Total Loans 59,536 65,694
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 631 1,841
60 - 89 Days Past Due 679 1,348
90+ Days Past Due 1,306 3,715
Total Past Due 2,616 6,904
Current Loans 131,591 129,008
Total Loans 134,207 135,912
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,115 2,702
60 - 89 Days Past Due 914 936
90+ Days Past Due 4,648 3,621
Total Past Due 6,677 7,259
Current Loans 448,547 441,551
Total Loans 455,224 448,810
Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 11  
Total Past Due 11  
Current Loans 2,382 1,709
Total Loans 2,393 1,709
Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 511 216
60 - 89 Days Past Due 83 196
Total Past Due 594 412
Current Loans 33,760 34,158
Total Loans 34,354 34,570
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 631 315
60 - 89 Days Past Due 39 93
90+ Days Past Due 942 495
Total Past Due 1,612 903
Current Loans 108,208 110,178
Total Loans 109,820 111,081
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 4,129 6,564
60 - 89 Days Past Due 468 1,176
90+ Days Past Due 1,768 1,644
Total Past Due 6,365 9,384
Current Loans 466,847 464,163
Total Loans 473,212 473,547
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 21,276 15,841
Total Loans 21,276 16,223
Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 390 715
60 - 89 Days Past Due 30 73
90+ Days Past Due 54 47
Total Past Due 474 835
Current Loans 68,528 77,328
Total Loans 69,002 78,163
Consumer and Other | Other
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 3  
Total Past Due 3  
Current Loans 3,749 5,666
Total Loans 3,752 5,666
Covered Loans
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,519 1,442
60 - 89 Days Past Due 513 408
90+ Days Past Due 2,140 2,807
Total Past Due 4,172 4,657
Current Loans 179,904 202,449
Total Loans 184,076 207,106
Covered Loans | Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 101 252
60 - 89 Days Past Due   161
90+ Days Past Due 700 1,121
Total Past Due 801 1,534
Current Loans 22,266 25,061
Total Loans 23,067 26,595
Covered Loans | Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 116 45
60 - 89 Days Past Due 21  
Total Past Due 137 45
Current Loans 4,275 6,903
Total Loans 4,412 6,948
Covered Loans | Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 2,434 2,611
Total Loans 2,434 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
60 - 89 Days Past Due 93  
90+ Days Past Due 26 21
Total Past Due 119 29
Current Loans 9,631 11,399
Total Loans 9,750 11,428
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 627 927
Total Past Due 627 1,428
Current Loans 40,573 47,137
Total Loans 41,200 48,565
Covered Loans | Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 31 144
Total Loans 31 144
Covered Loans | Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   6
60 - 89 Days Past Due 309  
Total Past Due 309 6
Current Loans 925 1,085
Total Loans 1,234 1,091
Covered Loans | Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 85 217
60 - 89 Days Past Due 9 112
90+ Days Past Due 162 204
Total Past Due 256 533
Current Loans 76,876 80,912
Total Loans 77,132 81,445
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 884 413
60 - 89 Days Past Due 81 135
90+ Days Past Due 455 475
Total Past Due 1,420 1,023
Current Loans 19,047 21,938
Total Loans 20,467 22,961
Covered Loans | Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
90+ Days Past Due 170 59
Total Past Due 170 59
Current Loans 1,468 1,585
Total Loans 1,638 1,644
Covered Loans | Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 333  
Total Past Due 333  
Current Loans 2,378 3,674
Total Loans $ 2,711 $ 3,674