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Aging of Past Due Loans by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due $ 9,838 $ 12,307
60 - 89 Days Past Due 4,373 2,802
90+ Days Past Due 8,324 11,961
Total Past Due 22,535 27,070
Current Loans 1,740,257 1,683,651
Total Loans 1,762,792 1,710,721
Non Covered Loans
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 8,717 10,929
60 - 89 Days Past Due 4,140 2,552
90+ Days Past Due 7,293 9,112
Total Past Due 20,150 22,593
Current Loans 1,616,031 1,536,446
Total Loans 1,636,181 1,559,039
Non Covered Loans | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 27 118
60 - 89 Days Past Due   10
90+ Days Past Due   532
Total Past Due 27 660
Current Loans 42,748 34,595
Total Loans 42,775 35,255
Non Covered Loans | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,433 93
60 - 89 Days Past Due   39
90+ Days Past Due 1,079 2,631
Total Past Due 2,512 2,763
Current Loans 86,197 92,692
Total Loans 88,709 95,455
Non Covered Loans | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 173 115
Total Past Due 173 115
Current Loans 99,639 70,082
Total Loans 99,812 70,197
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,074 611
60 - 89 Days Past Due 280 554
90+ Days Past Due 667 1,203
Total Past Due 2,021 2,368
Current Loans 141,883 133,191
Total Loans 143,904 135,559
Non Covered Loans | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 411 1,014
60 - 89 Days Past Due 871 318
90+ Days Past Due 1,229 1,770
Total Past Due 2,511 3,102
Current Loans 489,422 472,809
Total Loans 491,933 475,911
Non Covered Loans | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 4  
Total Past Due 4  
Current Loans 2,145 2,324
Total Loans 2,149 2,324
Non Covered Loans | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   245
Total Past Due   245
Current Loans 31,938 32,369
Total Loans 31,938 32,614
Non Covered Loans | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 444 289
60 - 89 Days Past Due 466 317
90+ Days Past Due 174 442
Total Past Due 1,084 1,048
Current Loans 111,779 110,722
Total Loans 112,863 111,770
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 4,770 7,428
60 - 89 Days Past Due 2,423 1,228
90+ Days Past Due 3,881 145
Total Past Due 11,074 8,801
Current Loans 487,449 487,211
Total Loans 498,523 496,012
Non Covered Loans | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due   205
90+ Days Past Due 226 2,284
Total Past Due 226 2,489
Current Loans 44,789 26,214
Total Loans 45,015 28,703
Non Covered Loans | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 381 811
60 - 89 Days Past Due 100 86
90+ Days Past Due 37 105
Total Past Due 518 1,002
Current Loans 70,734 70,311
Total Loans 71,252 71,313
Non Covered Loans | Consumer and Other | Other
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 7,308 3,926
Total Loans 7,308 3,926
Covered Loans
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 1,121 1,378
60 - 89 Days Past Due 233 250
90+ Days Past Due 1,031 2,849
Total Past Due 2,385 4,477
Current Loans 124,226 147,205
Total Loans 126,611 151,682
Covered Loans | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 226 479
90+ Days Past Due 72 453
Total Past Due 298 932
Current Loans 12,886 14,933
Total Loans 13,184 15,865
Covered Loans | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 17 5
60 - 89 Days Past Due 104 44
90+ Days Past Due 22 92
Total Past Due 143 141
Current Loans 2,503 3,184
Total Loans 2,646 3,325
Covered Loans | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 1,612 1,933
Total Loans 1,612 1,933
Covered Loans | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 100  
60 - 89 Days Past Due 40  
90+ Days Past Due 77 184
Total Past Due 217 184
Current Loans 5,995 7,265
Total Loans 6,212 7,449
Covered Loans | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 68 209
90+ Days Past Due 152  
Total Past Due 220 209
Current Loans 26,018 34,437
Total Loans 26,238 34,646
Covered Loans | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 151 164
Total Loans 151 164
Covered Loans | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
90+ Days Past Due   301
Total Past Due   301
Current Loans 729 572
Total Loans 729 873
Covered Loans | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 585 488
60 - 89 Days Past Due 76 86
90+ Days Past Due 204 163
Total Past Due 865 737
Current Loans 61,907 68,469
Total Loans 62,772 69,206
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 Days Past Due 125 197
60 - 89 Days Past Due 13 120
90+ Days Past Due 389 1,466
Total Past Due 527 1,783
Current Loans 11,977 15,136
Total Loans 12,504 16,919
Covered Loans | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
90+ Days Past Due 115 190
Total Past Due 115 190
Current Loans 351 994
Total Loans 466 1,184
Covered Loans | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current Loans 97 118
Total Loans $ 97 $ 118