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Loans Held for Investment by Internal Credit Risk Grade (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | $ 1,774,547 | $ 1,623,506
Covered under loss share agreements | 61,837 | 83,035
Total loans | 1,836,384 | 1,706,541
Commercial Loans |  |
Financing Receivable, Recorded Investment [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [Line Items] |  |
Not covered under loss share agreements | 3,029 | 7,338
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,689,094 | 1,533,392
Covered under loss share agreements | 32,106 | 40,101
Total loans | 1,721,200 | 1,573,493
Pass | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 48,015 | 46,816
Covered under loss share agreements | 2,830 | 3,908
Pass | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 85,440 | 87,223
Covered under loss share agreements | 926 | 1,144
Pass | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 118,153 | 81,168
Covered under loss share agreements |  | 460
Pass | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 133,550 | 139,680
Covered under loss share agreements | 1,056 | 1,808
Pass | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 568,766 | 454,906
Covered under loss share agreements | 7,038 | 9,192
Pass | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 5,711 | 2,886
Covered under loss share agreements | 26 | 34
Pass | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 29,653 | 25,855
Covered under loss share agreements | 143 | 364
Pass | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 106,086 | 104,897
Covered under loss share agreements | 15,092 | 17,893
Pass | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 471,389 | 468,155
Covered under loss share agreements | 4,810 | 5,102
Pass | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 43,216 | 42,783
Covered under loss share agreements | 105 | 112
Pass | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 76,086 | 71,685
Covered under loss share agreements | 80 | 84
Pass | Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 3,029 | 7,338
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 42,271 | 43,034
Covered under loss share agreements | 25,365 | 35,603
Total loans | 67,636 | 78,637
Special Mention | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 992 | 974
Covered under loss share agreements | 872 | 1,261
Special Mention | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 3,687 | 663
Covered under loss share agreements |  | 4
Special Mention | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 8,528 | 12,969
Special Mention | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 4,644 | 3,976
Covered under loss share agreements | 65 | 457
Special Mention | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 16,044 | 15,170
Covered under loss share agreements | 616 | 2,044
Special Mention | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 75 | 25
Special Mention | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,820 | 1,427
Special Mention | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 733 | 1,083
Covered under loss share agreements | 22,867 | 29,823
Special Mention | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 5,725 | 6,686
Covered under loss share agreements | 945 | 1,963
Special Mention | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Covered under loss share agreements |  | 51
Special Mention | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 23 | 61
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 41,987 | 47,080
Covered under loss share agreements | 4,366 | 7,331
Total loans | 46,353 | 54,411
Substandard | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 792 | 1,106
Covered under loss share agreements | 997 | 1,134
Substandard | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,235 | 1,017
Covered under loss share agreements | 15 | 22
Substandard | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 787 | 889
Covered under loss share agreements | 43 | 180
Substandard | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 5,829 | 5,695
Covered under loss share agreements | 207 | 409
Substandard | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 10,495 | 15,384
Covered under loss share agreements | 658 | 2,829
Substandard | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 501 | 258
Covered under loss share agreements | 269 | 279
Substandard | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,289 | 1,387
Covered under loss share agreements | 778 | 849
Substandard | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 20,102 | 20,368
Covered under loss share agreements | 1,303 | 1,530
Substandard | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 709 | 722
Covered under loss share agreements | 96 | 99
Substandard | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 248 | $ 254
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,189 |
Total loans | 1,189 |
Doubtful | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 710 |
Doubtful | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 479 |
Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 6 |
Total loans | 6 |
Loss | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | $ 6 |

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