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Recorded Investment and Related Information for Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 10,889 | $ 9,568
Impaired loans with a related allowance, Recorded Investment | 11,131 | 6,480
Total impaired loans, Recorded Investment | 22,020 | 16,048
Impaired loans with no related allowance, Unpaid Principal balance | 11,348 | 10,009
Impaired loans with a related allowance, Unpaid Principal Balance | 11,171 | 6,651
Total impaired loans, Unpaid Principal Balance | 22,519 | 16,660
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 2,641 | 1,482
Total impaired loans, Related Allowance | 2,641 | 1,482
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 783 | 466
Impaired loans with a related allowance, Recorded Investment | 621 | 367
Impaired loans with no related allowance, Unpaid Principal balance | 785 | 466
Impaired loans with a related allowance, Unpaid Principal Balance | 624 | 367
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 117 | 45
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 8,772 | 5,705
Impaired loans with a related allowance, Recorded Investment | 5,359 | 3,772
Impaired loans with no related allowance, Unpaid Principal balance | 9,159 | 6,049
Impaired loans with a related allowance, Unpaid Principal Balance | 5,374 | 3,772
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 1,711 | 1,000
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 1,334 | 3,397
Impaired loans with a related allowance, Recorded Investment | 4,798 | 2,341
Impaired loans with no related allowance, Unpaid Principal balance | 1,404 | 3,494
Impaired loans with a related allowance, Unpaid Principal Balance | 4,817 | 2,512
Impaired loans with no related allowance, Related Allowance | 0 | 0
Impaired loans with a related allowance, Related Allowance | 760 | $ 437
Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with a related allowance, Recorded Investment | 353 |
Impaired loans with a related allowance, Unpaid Principal Balance | 356 |
Impaired loans with a related allowance, Related Allowance | $ 53 |

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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