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Average Annual Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment | $ 11,913 | $ 9,600 | $ 15,728
Impaired loans with a related allowance, Average Recorded Investment | 9,471 | 14,098 | 12,620
Total impaired loans, Average Recorded Investment | 21,384 | 23,698 | 28,348
Impaired loans with no related allowance, Interest Income | 465 | 207 | 821
Impaired loans with a related allowance, Interest Income | 117 | 152 | 240
Total impaired loans, Interest Income | 582 | 359 | 1,061
Commercial Loans | Construction Development And Other Land |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  | 3,850
Impaired loans with a related allowance, Average Recorded Investment |  |  | 1,057
Impaired loans with no related allowance, Interest Income |  |  | 294
Impaired loans with a related allowance, Interest Income |  |  | 117
Commercial Loans | Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 461 | 698
Impaired loans with a related allowance, Average Recorded Investment |  | 2,199 | 4,281
Impaired loans with no related allowance, Interest Income |  | 17 | 17
Impaired loans with a related allowance, Interest Income |  | 47 | 18
Commercial Loans | Multi-family Residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  | 18
Impaired loans with a related allowance, Average Recorded Investment |  | 4,190 | 94
Impaired loans with no related allowance, Interest Income |  |  | 3
Impaired loans with a related allowance, Interest Income |  | 23 | 7
Commercial Loans | Single-family Non-owner Occupied |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 626 | 301 | 939
Impaired loans with a related allowance, Average Recorded Investment | 575 | 369 | 892
Impaired loans with no related allowance, Interest Income | 34 | 8 | 99
Impaired loans with a related allowance, Interest Income | 25 | 2 | 3
Commercial Loans | Non-farm, Non-residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 8,767 | 6,083 | 7,225
Impaired loans with a related allowance, Average Recorded Investment | 4,987 | 3,386 | 1,494
Impaired loans with no related allowance, Interest Income | 295 | 96 | 296
Impaired loans with a related allowance, Interest Income | 65 | 31 | 29
Commercial Loans | Farmland Loan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 181 | 370
Impaired loans with no related allowance, Interest Income |  | 11 | 12
Consumer Real Estate | Home Equity Lines |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 66 | 454
Impaired loans with a related allowance, Average Recorded Investment |  | 57 | 304
Impaired loans with no related allowance, Interest Income |  | 2 | 25
Impaired loans with a related allowance, Interest Income |  | 1 | 12
Consumer Real Estate | Single Family Owner Occupied |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 2,432 | 2,508 | 2,156
Impaired loans with a related allowance, Average Recorded Investment | 3,731 | 3,897 | 4,498
Impaired loans with no related allowance, Interest Income | 136 | 73 | 70
Impaired loans with a related allowance, Interest Income | 26 | $ 48 | 54
Consumer Real Estate | Owner Occupied Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 88 |  | 15
Impaired loans with a related allowance, Average Recorded Investment | 178 |  |
Impaired loans with no related allowance, Interest Income |  |  | 5
Impaired loans with a related allowance, Interest Income | $ 1 |  |
Consumer Portfolio Segment | Consumer Loan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  | $ 3

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