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Average Annual Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | $ 6,282 | $ 12,387 | $ 7,827 | $ 12,639
Impaired loans with a related allowance, Average Recorded Investment | 10,534 | 8,176 | 10,778 | 7,488
Total impaired loans, Average Recorded Investment | 16,816 | 20,563 | 18,605 | 20,127
Impaired loans with no related allowance, Interest Income | 59 | 91 | 136 | 201
Impaired loans with a related allowance, Interest Income | 117 | 127 | 250 | 230
Total impaired loans, Interest Income | 176 | 218 | 386 | 431
Commercial Loans | Single-family Non-owner Occupied |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 456 | 463 | 617 | 461
Impaired loans with a related allowance, Average Recorded Investment | 677 | 684 | 517 | 523
Impaired loans with no related allowance, Interest Income | 7 | 7 | 15 | 16
Impaired loans with a related allowance, Interest Income | 6 | 10 | 13 | 17
Commercial Loans | Non-farm, Non-residential |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 4,757 | 8,831 | 6,374 | 8,812
Impaired loans with a related allowance, Average Recorded Investment | 5,307 | 4,738 | 5,333 | 4,401
Impaired loans with no related allowance, Interest Income | 52 | 63 | 121 | 146
Impaired loans with a related allowance, Interest Income | 82 | 96 | 170 | 174
Consumer Real Estate | Single Family Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 726 | 2,741 | 665 | 3,190
Impaired loans with a related allowance, Average Recorded Investment | 4,550 | 2,754 | 4,755 | 2,564
Impaired loans with no related allowance, Interest Income |  | 16 |  | 34
Impaired loans with a related allowance, Interest Income | 29 | 21 | 67 | 39
Consumer Real Estate | Owner Occupied Construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | $ 343 | 352 | 171 | 176
Impaired loans with a related allowance, Average Recorded Investment |  |  | $ 173 |
Impaired loans with no related allowance, Interest Income |  | $ 5 |  | $ 5

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