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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | $ 986 | $ 835 | $ 902
Impaired loans with a related allowance, Interest Income Recognized | 370 | 117 | 152
Total impaired loans, Interest Income Recognized | 1,356 | 952 | 1,054
Impaired loans with no related allowance, Average Recorded Investment | 27,494 | 29,064 | 25,128
Impaired loans with a related allowance, Average Recorded Investment | 8,996 | 9,471 | 14,098
Total impaired loans, Average Recorded Investment | 36,490 | 38,535 | 39,226
Commercial Loans | Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 16 |  | 18
Impaired loans with a related allowance, Interest Income Recognized |  |  | 47
Impaired loans with no related allowance, Average Recorded Investment | 646 | 324 | 1,627
Impaired loans with a related allowance, Average Recorded Investment |  |  | 2,199
Commercial Loans | Multi-family Residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 21 | 4 | 21
Impaired loans with a related allowance, Interest Income Recognized |  |  | 23
Impaired loans with no related allowance, Average Recorded Investment | 308 | 269 | 162
Impaired loans with a related allowance, Average Recorded Investment |  |  | 4,190
Commercial Loans | Single-family Non-owner Occupied |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 178 | 88 | 60
Impaired loans with a related allowance, Interest Income Recognized | 23 | 25 | 2
Impaired loans with no related allowance, Average Recorded Investment | 3,076 | 2,140 | 1,629
Impaired loans with a related allowance, Average Recorded Investment | 518 | 575 | 369
Commercial Loans | Non-farm, Non-residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 307 | 312 | 353
Impaired loans with a related allowance, Interest Income Recognized | 215 | 65 | 31
Impaired loans with no related allowance, Average Recorded Investment | 8,573 | 11,677 | 8,248
Impaired loans with a related allowance, Average Recorded Investment | 3,831 | 4,987 | 3,386
Commercial Loans | Farmland Loan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 55 | 16 | 6
Impaired loans with a related allowance, Interest Income Recognized | 14 |  |
Impaired loans with no related allowance, Average Recorded Investment | 437 | 195 | 315
Impaired loans with a related allowance, Average Recorded Investment | 108 |  |
Commercial Loans | Construction Development And Other Land |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 22 | 5 | 8
Impaired loans with no related allowance, Average Recorded Investment | 344 | 481 | 607
Commercial Loans | Agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  | 1
Consumer Real Estate | Home Equity Lines |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 30 | 36 | 22
Impaired loans with a related allowance, Interest Income Recognized |  |  | 1
Impaired loans with no related allowance, Average Recorded Investment | 1,223 | 813 | 686
Impaired loans with a related allowance, Average Recorded Investment |  |  | 57
Consumer Real Estate | Single Family Owner Occupied |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 343 | 356 | 404
Impaired loans with a related allowance, Interest Income Recognized | 118 | 26 | 48
Impaired loans with no related allowance, Average Recorded Investment | 12,330 | 12,708 | 11,486
Impaired loans with a related allowance, Average Recorded Investment | 4,452 | 3,731 | 3,897
Consumer Real Estate | Owner Occupied Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 9 | 10 | 5
Impaired loans with a related allowance, Interest Income Recognized |  | 1 |
Impaired loans with no related allowance, Average Recorded Investment | 497 | 359 | 259
Impaired loans with a related allowance, Average Recorded Investment | 87 | 178 |
Consumer and Other Loans | Consumer Loan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Construction, development, and other land | 5 | 8 | 5
Impaired loans with no related allowance, Average Recorded Investment | $ 60 | $ 98 | $ 108

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