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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 11,184 | $ 9,568
Impaired loans with a related allowance, Recorded Investment | 11,534 | 6,480
Total impaired loans, Recorded Investment | 22,718 | 16,048
Impaired loans with no related allowance, Unpaid Principal balance | 11,277 | 10,009
Impaired loans with a related allowance, Unpaid Principal Balance | 11,558 | 6,651
Total impaired loans, Unpaid Principal Balance | 22,835 | 16,660
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 2,371 | 1,482
Total impaired loans, Related Allowance | 2,371 | 1,482
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 782 | 466
Impaired loans with a related allowance, Recorded Investment | 619 | 367
Impaired loans with no related allowance, Unpaid Principal balance | 783 | 466
Impaired loans with a related allowance, Unpaid Principal Balance | 623 | 367
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 124 | 45
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 8,427 | 5,705
Impaired loans with a related allowance, Recorded Investment | 5,667 | 3,772
Impaired loans with no related allowance, Unpaid Principal balance | 8,427 | 6,049
Impaired loans with a related allowance, Unpaid Principal Balance | 5,673 | 3,772
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 1,568 | 1,000
Consumer Real Estate | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment |  | 3,397
Impaired loans with a related allowance, Recorded Investment |  | 2,341
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 1,975 |
Impaired loans with a related allowance, Recorded Investment | 4,899 |
Impaired loans with no related allowance, Unpaid Principal balance | 2,067 | 3,494
Impaired loans with a related allowance, Unpaid Principal Balance | 4,907 | 2,512
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 672 | $ 437
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with a related allowance, Recorded Investment | 349 |
Impaired loans with a related allowance, Unpaid Principal Balance | 355 |
Impaired loans with a related allowance, Related Allowance | $ 7 |

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