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Aging of Past Due Loans by Loan Class (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 16,416 | $ 25,079
Current Loans | 1,785,567 | 1,681,462
Total loans | 1,801,983 | 1,706,541
Not covered under loss share agreements | 1,733,398 | 1,623,506
Covered under loss share agreements | 68,585 | 83,035
Commercial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 996,428 | 898,087
Covered under loss share agreements | 18,614 | 25,529
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 58,971 | 48,896
Covered under loss share agreements | 5,487 | 6,303
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 92,791 | 88,903
Covered under loss share agreements | 973 | 1,170
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 109,651 | 95,026
Covered under loss share agreements | 74 | 640
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 153,308 | 149,351
Covered under loss share agreements | 1,866 | 2,674
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 549,771 | 485,460
Covered under loss share agreements | 9,570 | 14,065
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 4,421 | 2,911
Covered under loss share agreements | 26 | 34
Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 27,515 | 27,540
Covered under loss share agreements | 618 | 643
Consumer Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 653,760 | 646,081
Covered under loss share agreements | 49,890 | 57,422
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 106,517 | 107,367
Covered under loss share agreements | 42,254 | 48,565
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 504,057 | 495,209
Covered under loss share agreements | 7,432 | 8,595
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 43,186 | 43,505
Covered under loss share agreements | 204 | 262
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 75,703 | 72,000
Covered under loss share agreements | 81 | 84
Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 7,507 | 7,338
Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 725 | 2,682
Current Loans | 67,860 | 80,353
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 107 | 138
Current Loans | 5,380 | 6,165
Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 16
Current Loans | 973 | 1,154
Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 74 | 640
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 27 | 1,422
Current Loans | 1,839 | 1,252
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 39
Current Loans | 9,570 | 14,026
Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 26 | 34
Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 618 | 643
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 395 | 751
Current Loans | 41,859 | 47,814
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 196 | 316
Current Loans | 7,236 | 8,279
Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 204 | 262
Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 81 | 84
Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15,691 | 22,397
Current Loans | 1,717,707 | 1,601,109
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 54 | 39
Current Loans | 58,917 | 48,857
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 517 | 347
Current Loans | 92,274 | 88,556
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 362 | 462
Current Loans | 109,289 | 94,564
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,658 | 1,797
Current Loans | 151,650 | 147,554
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3,297 | 5,963
Current Loans | 546,474 | 479,497
Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 4,421 | 2,911
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 161 | 830
Current Loans | 27,354 | 26,710
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,272 | 1,331
Current Loans | 105,245 | 106,036
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7,327 | 11,256
Current Loans | 496,730 | 483,953
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 556 |
Current Loans | 42,630 | 43,505
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 487 | 372
Current Loans | 75,216 | 71,628
Non Covered Loans | Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 7,507 | 7,338
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5,933 | 11,612
Financing Receivables, 30 to 59 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 270 | 2,281
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 46 | 96
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 27 | 1,422
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 116 | 489
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 81 | 274
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5,663 | 9,331
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 39 |
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 303 | 281
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 297 | 302
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 460 | 748
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 723 | 347
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 92 | 585
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 380 | 668
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,406 | 6,122
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 556 |
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 407 | 278
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,458 | 3,195
Financing Receivables, 60 to 89 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 150 | 37
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 41 |
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 69 | 37
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 40 |
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,308 | 3,158
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 |
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 79 | 66
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 76
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 202 | 120
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 263 | 676
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 69 | 11
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 186 | 195
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,436 | 1,943
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 58 | 71
Financing Receivables, Equal to Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8,025 | 10,272
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 305 | 364
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 20 | 42
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 16
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 39
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 210 | 225
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 75 | 42
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7,720 | 9,908
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 39
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 135 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 65 | 84
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 996 | 929
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,311 | 4,940
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 234
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 706 | 468
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3,485 | 3,191
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 22 | $ 23

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