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Aging of Past Due Loans by Loan Class (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 22,779 | $ 25,079
Current Loans | 1,813,605 | 1,681,462
Total loans | 1,836,384 | 1,706,541
Not covered under loss share agreements | 1,774,547 | 1,623,506
Covered under loss share agreements | 61,837 | 83,035
Commercial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 1,045,427 | 898,087
Covered under loss share agreements | 15,761 | 25,529
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 49,799 | 48,896
Covered under loss share agreements | 4,699 | 6,303
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 90,362 | 88,903
Covered under loss share agreements | 941 | 1,170
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 127,468 | 95,026
Covered under loss share agreements | 43 | 640
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 144,023 | 149,351
Covered under loss share agreements | 1,328 | 2,674
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 596,015 | 485,460
Covered under loss share agreements | 8,312 | 14,065
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 5,786 | 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 | 31,974 | 27,540
Covered under loss share agreements | 412 | 643
Consumer Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 649,728 | 646,081
Covered under loss share agreements | 45,996 | 57,422
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 108,108 | 107,367
Covered under loss share agreements | 38,737 | 48,565
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 497,695 | 495,209
Covered under loss share agreements | 7,058 | 8,595
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 43,925 | 43,505
Covered under loss share agreements | 201 | 262
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 76,363 | 72,000
Covered under loss share agreements | 80 | 84
Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 3,029 | 7,338
Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 919 | 2,682
Current Loans | 60,918 | 80,353
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 144 | 138
Current Loans | 4,555 | 6,165
Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 16
Current Loans | 941 | 1,154
Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 43 | 640
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 25 | 1,422
Current Loans | 1,303 | 1,252
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 39
Current Loans | 8,312 | 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 | 412 | 643
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 400 | 751
Current Loans | 38,337 | 47,814
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 350 | 316
Current Loans | 6,708 | 8,279
Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 201 | 262
Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 80 | 84
Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 21,860 | 22,397
Current Loans | 1,752,687 | 1,601,109
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 122 | 39
Current Loans | 49,677 | 48,857
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 323 | 347
Current Loans | 90,039 | 88,556
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 660 | 462
Current Loans | 126,808 | 94,564
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,195 | 1,797
Current Loans | 142,828 | 147,554
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7,454 | 5,963
Current Loans | 588,561 | 479,497
Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 255 |
Current Loans | 5,531 | 2,911
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 648 | 830
Current Loans | 31,326 | 26,710
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 940 | 1,331
Current Loans | 107,168 | 106,036
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8,948 | 11,256
Current Loans | 488,747 | 483,953
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 593 |
Current Loans | 43,332 | 43,505
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 722 | 372
Current Loans | 75,641 | 71,628
Non Covered Loans | Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 3,029 | 7,338
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 11,594 | 11,612
Financing Receivables, 30 to 59 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 695 | 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 | 105 | 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 | 25 | 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 | 333 | 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 | 232 | 274
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10,899 | 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 | 5 |
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 | 121 | 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 | 283 | 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 | 110 | 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 | 4,726 | 347
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 255 |
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 | 72 | 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 | 377 | 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 | 4,123 | 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 | 251 |
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 | 576 | 278
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3,551 | 3,195
Financing Receivables, 60 to 89 Days Past Due | Covered Loans |  |
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 | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 43 | 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 | 26 |
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3,482 | 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 | 64 |
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 | 31 | 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 | 71 | 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 | 305 | 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 | 277 | 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 | 576 | 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 | 169 | 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 | 1,875 | 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 | 114 | 71
Financing Receivables, Equal to Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7,634 | 10,272
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 155 | 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 | 39 | 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 | 24 | 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 | 92 | 42
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7,479 | 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 | 53 | 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 | 171 |
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 | 306 | 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 | 780 | 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 | 2,451 | 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 | 394 | 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 | 2,950 | 3,191
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 342 |
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 | $ 32 | $ 23

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