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Aging of Past Due Loans by Loan Class (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 20,639 | $ 25,079
Current Loans | 1,741,790 | 1,681,462
Total loans | 1,762,429 | 1,706,541
Not covered under loss share agreements | 1,685,891 | 1,623,506
Covered under loss share agreements | 76,538 | 83,035
Commercial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 960,043 | 898,087
Covered under loss share agreements | 22,612 | 25,529
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 52,529 | 48,896
Covered under loss share agreements | 6,129 | 6,303
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 92,397 | 88,903
Covered under loss share agreements | 1,020 | 1,170
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 111,388 | 95,026
Covered under loss share agreements | 100 | 640
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 151,595 | 149,351
Covered under loss share agreements | 2,258 | 2,674
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 521,471 | 485,460
Covered under loss share agreements | 12,439 | 14,065
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 3,650 | 2,911
Covered under loss share agreements | 34 | 34
Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 27,013 | 27,540
Covered under loss share agreements | 632 | 643
Consumer Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 644,866 | 646,081
Covered under loss share agreements | 53,844 | 57,422
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 106,444 | 107,367
Covered under loss share agreements | 45,745 | 48,565
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 497,530 | 495,209
Covered under loss share agreements | 7,837 | 8,595
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 40,892 | 43,505
Covered under loss share agreements | 262 | 262
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 73,531 | 72,000
Covered under loss share agreements | 82 | 84
Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 7,451 | 7,338
Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,390 | 2,682
Current Loans | 74,148 | 80,353
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 179 | 138
Current Loans | 5,950 | 6,165
Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 16 | 16
Current Loans | 1,004 | 1,154
Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 100 | 640
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 1,422
Current Loans | 2,258 | 1,252
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,466 | 39
Current Loans | 10,973 | 14,026
Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 34 | 34
Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 632 | 643
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 545 | 751
Current Loans | 45,200 | 47,814
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 184 | 316
Current Loans | 7,653 | 8,279
Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 262 | 262
Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 82 | 84
Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 18,249 | 22,397
Current Loans | 1,667,642 | 1,601,109
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 111 | 39
Current Loans | 52,419 | 48,857
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 175 | 347
Current Loans | 92,222 | 88,556
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 141 | 462
Current Loans | 111,247 | 94,564
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,388 | 1,797
Current Loans | 150,207 | 147,554
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5,416 | 5,963
Current Loans | 516,055 | 479,497
Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 3,650 | 2,911
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 176 | 830
Current Loans | 26,837 | 26,710
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,183 | 1,331
Current Loans | 105,261 | 106,036
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8,905 | 11,256
Current Loans | 488,625 | 483,953
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 346 |
Current Loans | 40,546 | 43,505
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 408 | 372
Current Loans | 73,123 | 71,628
Non Covered Loans | Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 7,451 | 7,338
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 6,790 | 11,612
Financing Receivables, 30 to 59 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 382 | 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 | 48 | 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 |  | 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 | 274 | 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 | 60 | 274
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 6,408 | 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 | 10 |
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 | 28 | 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 | 74 | 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 | 615 | 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 | 11 | 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 | 108 | 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 | 294 | 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 | 4,602 | 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 | 346 |
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 | 320 | 278
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3,232 | 3,195
Financing Receivables, 60 to 89 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 360 | 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 | 94 |
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 | 142 | 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 | 124 |
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,872 | 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 | 16 |
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 | 147 | 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 | 67 | 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 | 235 | 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 | 544 | 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 |  | 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 | 163 | 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 | 1,618 | 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 | 82 | 71
Financing Receivables, Equal to Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10,617 | 10,272
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,648 | 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 | 37 | 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 | 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 | 1,466 | 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 | 129 | 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 |  | 42
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8,969 | 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 | 85 | 39
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 |  | 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 | 538 | 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 | 4,861 | 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 | 68 | 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 | 726 | 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 | 2,685 | 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 | $ 6 | $ 23

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