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Aging of Past Due Loans by Loan Class (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 19,099 | $ 24,126
Current Loans | 1,671,375 | 1,665,290
Total loans | 1,690,474 | 1,689,416
Not covered under loss share agreements | 1,600,271 | 1,567,176
Covered under loss share agreements | 90,203 | 122,240
Commercial Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 878,176 | 862,043
Covered under loss share agreements | 28,900 | 49,340
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 45,930 | 41,271
Covered under loss share agreements | 7,573 | 13,100
Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 85,319 | 83,099
Covered under loss share agreements | 1,326 | 2,662
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 93,356 | 97,480
Covered under loss share agreements | 699 | 1,584
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 144,725 | 135,171
Covered under loss share agreements | 2,899 | 5,918
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 479,297 | 473,906
Covered under loss share agreements | 15,712 | 25,317
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 2,414 | 1,599
Covered under loss share agreements | 35 | 43
Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 27,135 | 29,517
Covered under loss share agreements | 656 | 716
Consumer Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 639,953 | 629,231
Covered under loss share agreements | 61,219 | 72,812
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 107,655 | 110,957
Covered under loss share agreements | 51,205 | 60,391
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 492,157 | 485,475
Covered under loss share agreements | 9,736 | 11,968
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 40,141 | 32,799
Covered under loss share agreements | 278 | 453
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 75,084 | 69,347
Covered under loss share agreements | 84 | 88
Consumer and Other | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Not covered under loss share agreements | 7,058 | 6,555
Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 17,891 | 20,208
Current Loans | 1,582,380 | 1,546,968
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 152 | 85
Current Loans | 45,778 | 41,186
Non Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 110 | 394
Current Loans | 85,209 | 82,705
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 149 | 191
Current Loans | 93,207 | 97,289
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,816 | 1,852
Current Loans | 142,909 | 133,319
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 6,315 | 3,842
Current Loans | 472,982 | 470,064
Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 4
Current Loans | 2,414 | 1,595
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 291 | 89
Current Loans | 26,844 | 29,428
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 802 | 1,166
Current Loans | 106,853 | 109,791
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7,754 | 11,931
Current Loans | 484,403 | 473,544
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 40,141 | 32,799
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 502 | 654
Current Loans | 74,582 | 68,693
Non Covered Loans | Consumer and Other | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 7,058 | 6,555
Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,208 | 3,918
Current Loans | 88,995 | 118,322
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 137 | 137
Current Loans | 7,436 | 12,963
Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 25 | 130
Current Loans | 1,301 | 2,532
Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 699 | 1,584
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 | 199
Current Loans | 2,896 | 5,719
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 162 | 1,522
Current Loans | 15,550 | 23,795
Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 35 | 43
Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 3
Current Loans | 656 | 713
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 568 | 1,344
Current Loans | 50,637 | 59,047
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 107 | 583
Current Loans | 9,629 | 11,385
Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 206 |
Current Loans | 72 | 453
Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current Loans | 84 | 88
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5,586 | 10,400
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 4,838 | 8,955
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 | 42 | 39
Financing Receivables, 30 to 59 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 55 | 285
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 | 72 | 81
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 | 241 | 914
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 | 800 | 1,075
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 | 71 | 89
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 | 320 | 492
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 | 2,802 | 5,436
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 | 435 | 544
Financing Receivables, 30 to 59 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 748 | 1,445
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 | 93 | 120
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 84
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 |  | 122
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 124
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 3
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 | 454 | 858
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 |  | 134
Financing Receivables, 30 to 59 Days Past Due | Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 186 |
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,790 | 4,097
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,449 | 3,576
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 | 11 | 46
Financing Receivables, 60 to 89 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 6
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 | 77 | 110
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 | 441 | 513
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 | 42 | 783
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 |
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 | 24 | 103
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 | 1,743 | 1,931
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 | 42 | 84
Financing Receivables, 60 to 89 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 341 | 521
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 | 2 | 17
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 9 | 12
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 |
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 108 | 140
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 | 106 | 318
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 | 93 | 34
Financing Receivables, 60 to 89 Days Past Due | Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 20 |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10,723 | 9,629
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10,604 | 7,677
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 | 99 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 55 | 103
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 | 1,134 | 425
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 | 5,473 | 1,984
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 4
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 | 151 |
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 | 458 | 571
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 | 3,209 | 4,564
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 | 25 | 26
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 119 | 1,952
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 | 42 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 16 | 34
Financing Receivables, Equal to Greater than 90 Days Past Due | Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 77
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 | 1,258
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 | 8 | 168
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 | $ 14 | $ 415

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