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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | $ 11,023 | $ 10,430 | $ 12,100 | $ 9,458
Impaired loans with a related allowance, Average Recorded Investment | 11,250 | 12,851 | 8,742 | 16,584
Total impaired loans, Average Recorded Investment | 22,273 | 23,281 | 20,842 | 26,042
Impaired loans with no related allowance, Interest Income Recognized | 99 | 17 | 423 | 188
Impaired loans with a related allowance, Interest Income Recognized | 29 | 16 | 100 | 146
Total impaired loans, Interest Income Recognized | 128 | 33 | 523 | 334
Owner occupied construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  | 117 |
Impaired loans with a related allowance, Average Recorded Investment | 357 |  | 119 |
Impaired loans with a related allowance, Interest Income Recognized | 1 |  | 1 |
Commercial Loans | Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 1,258 |  | 614
Impaired loans with a related allowance, Average Recorded Investment |  |  |  | 2,932
Impaired loans with no related allowance, Interest Income Recognized |  |  |  | 17
Impaired loans with a related allowance, Interest Income Recognized |  |  |  | 47
Commercial Loans | Single-family Non-owner Occupied |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 792 | 321 | 571 | 247
Impaired loans with a related allowance, Average Recorded Investment | 629 | 369 | 558 | 370
Impaired loans with no related allowance, Interest Income Recognized | 27 | 7 | 28 | 8
Impaired loans with a related allowance, Interest Income Recognized |  | 1 | 22 | 2
Commercial Loans | Non-farm, Non-residential |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 8,878 | 5,971 | 8,834 | 6,089
Impaired loans with a related allowance, Average Recorded Investment | 5,417 | 4,386 | 4,740 | 4,404
Impaired loans with no related allowance, Interest Income Recognized | 72 |  | 295 | 89
Impaired loans with a related allowance, Interest Income Recognized | 15 | 6 | 51 | 31
Commercial Loans | Farmland Loan |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  |  | 241
Impaired loans with no related allowance, Interest Income Recognized |  |  |  | 11
Commercial Loans | Multi-family Residential |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with a related allowance, Average Recorded Investment |  | 5,568 |  | 5,586
Impaired loans with a related allowance, Interest Income Recognized |  | 1 |  | 23
Consumer Real Estate | Home Equity Lines |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  |  | 88
Impaired loans with a related allowance, Average Recorded Investment |  |  |  | 76
Impaired loans with no related allowance, Interest Income Recognized |  |  |  | 2
Impaired loans with a related allowance, Interest Income Recognized |  |  |  | 1
Consumer Real Estate | Single Family Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 1,353 | 2,880 | 2,578 | 2,179
Impaired loans with a related allowance, Average Recorded Investment | 4,847 | 2,528 | 3,325 | 3,216
Impaired loans with no related allowance, Interest Income Recognized |  | 10 | 100 | 61
Impaired loans with a related allowance, Interest Income Recognized | $ 13 | $ 8 | $ 26 | $ 42

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