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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 6,271 | $ 11,184
Impaired loans with a related allowance, Recorded Investment | 10,527 | 11,534
Total impaired loans, Recorded Investment | 16,798 | 22,718
Impaired loans with no related allowance, Unpaid Principal balance | 6,323 | 11,277
Impaired loans with a related allowance, Unpaid Principal Balance | 10,592 | 11,558
Total impaired loans, Unpaid Principal Balance | 16,915 | 22,835
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 2,386 | 2,371
Total impaired loans, Related Allowance | 2,386 | 2,371
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 457 | 782
Impaired loans with a related allowance, Recorded Investment | 678 | 619
Impaired loans with no related allowance, Unpaid Principal balance | 457 | 783
Impaired loans with a related allowance, Unpaid Principal Balance | 680 | 623
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 108 | 124
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 4,747 | 8,427
Impaired loans with a related allowance, Recorded Investment | 5,300 | 5,667
Impaired loans with no related allowance, Unpaid Principal balance | 4,747 | 8,427
Impaired loans with a related allowance, Unpaid Principal Balance | 5,319 | 5,673
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 1,518 | 1,568
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 724 | 1,975
Impaired loans with a related allowance, Recorded Investment | 4,549 | 4,899
Impaired loans with no related allowance, Unpaid Principal balance | 766 | 2,067
Impaired loans with a related allowance, Unpaid Principal Balance | 4,593 | 4,907
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 760 | 672
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 343 |
Impaired loans with a related allowance, Recorded Investment |  | 349
Impaired loans with no related allowance, Unpaid Principal balance | 353 |
Impaired loans with a related allowance, Unpaid Principal Balance |  | 355
Impaired loans with no related allowance, Related Allowance | $ 0 | 0
Impaired loans with a related allowance, Related Allowance |  | $ 7

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