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Loans Held for Investment by Internal Credit Risk Grade (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | $ 1,795,954 | $ 1,623,506
Covered under loss share agreements | 56,994 | 83,035
Total loans | 1,852,948 | 1,706,541
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,062,751 | 898,087
Covered under loss share agreements | 14,369 | 25,529
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 56,948 | 48,896
Covered under loss share agreements | 4,570 | 6,303
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 92,204 | 88,903
Covered under loss share agreements | 895 | 1,170
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 134,228 | 95,026
Covered under loss share agreements | 8 | 640
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 142,965 | 149,351
Covered under loss share agreements | 962 | 2,674
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 598,674 | 485,460
Covered under loss share agreements | 7,512 | 14,065
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 6,003 | 2,911
Covered under loss share agreements | 25 | 34
Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 31,729 | 27,540
Covered under loss share agreements | 397 | 643
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 651,787 | 646,081
Covered under loss share agreements | 42,546 | 57,422
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 106,361 | 107,367
Covered under loss share agreements | 35,817 | 48,565
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 500,891 | 495,209
Covered under loss share agreements | 6,729 | 8,595
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 44,535 | 43,505
Covered under loss share agreements |  | 262
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 77,445 | 72,000
Covered under loss share agreements | 79 | 84
Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 3,971 | 7,338
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,719,488 | 1,533,392
Covered under loss share agreements | 29,989 | 40,101
Total loans | 1,749,477 | 1,573,493
Pass | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 55,188 | 46,816
Covered under loss share agreements | 2,768 | 3,908
Pass | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 87,581 | 87,223
Covered under loss share agreements | 882 | 1,144
Pass | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 126,468 | 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 | 131,934 | 139,680
Covered under loss share agreements | 796 | 1,808
Pass | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 579,134 | 454,906
Covered under loss share agreements | 6,423 | 9,192
Pass | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 5,839 | 2,886
Covered under loss share agreements | 25 | 34
Pass | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 28,887 | 25,855
Covered under loss share agreements | 132 | 364
Pass | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 104,033 | 104,897
Covered under loss share agreements | 14,283 | 17,893
Pass | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 475,402 | 468,155
Covered under loss share agreements | 4,601 | 5,102
Pass | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 43,833 | 42,783
Covered under loss share agreements |  | 112
Pass | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 77,218 | 71,685
Covered under loss share agreements | 79 | 84
Pass | Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 3,971 | 7,338
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 34,062 | 43,034
Covered under loss share agreements | 23,094 | 35,603
Total loans | 57,156 | 78,637
Special Mention | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 980 | 974
Covered under loss share agreements | 803 | 1,261
Special Mention | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 3,483 | 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 | 6,992 | 12,969
Special Mention | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 5,466 | 3,976
Covered under loss share agreements | 63 | 457
Special Mention | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 10,236 | 15,170
Covered under loss share agreements | 537 | 2,044
Special Mention | Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 164 | 25
Special Mention | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,223 | 1,427
Special Mention | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 871 | 1,083
Covered under loss share agreements | 20,763 | 29,823
Special Mention | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 4,636 | 6,686
Covered under loss share agreements | 928 | 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 | 11 | 61
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 41,727 | 47,080
Covered under loss share agreements | 3,911 | 7,331
Total loans | 45,638 | 54,411
Substandard | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 780 | 1,106
Covered under loss share agreements | 999 | 1,134
Substandard | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,137 | 1,017
Covered under loss share agreements | 13 | 22
Substandard | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 768 | 889
Covered under loss share agreements | 8 | 180
Substandard | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 5,565 | 5,695
Covered under loss share agreements | 103 | 409
Substandard | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 9,102 | 15,384
Covered under loss share agreements | 552 | 2,829
Substandard | Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,619 | 258
Covered under loss share agreements | 265 | 279
Substandard | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 1,457 | 1,387
Covered under loss share agreements | 771 | 849
Substandard | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 20,381 | 20,368
Covered under loss share agreements | 1,200 | 1,530
Substandard | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 702 | 722
Covered under loss share agreements |  | 99
Substandard | Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 216 | $ 254
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 674 |
Total loans | 674 |
Doubtful | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 202 |
Doubtful | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 472 |
Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | 3 |
Total loans | 3 |
Loss | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Not covered under loss share agreements | $ 3 |

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