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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
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Average Recorded Investment | $ 9,372 | $ 12,891
Impaired loans with a related allowance, Average Recorded Investment | 11,023 | 6,799
Total impaired loans, Average Recorded Investment | 20,395 | 19,690
Impaired loans with no related allowance, Interest Income | 77 | 110
Impaired loans with a related allowance, Interest Income | 133 | 103
Total impaired loans, Interest Income | 210 | 213
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Average Recorded Investment | 779 | 459
Impaired loans with a related allowance, Average Recorded Investment | 358 | 361
Impaired loans with no related allowance, Interest Income | 8 | 9
Impaired loans with a related allowance, Interest Income | 7 | 7
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Average Recorded Investment | 7,990 | 8,792
Impaired loans with a related allowance, Average Recorded Investment | 5,358 | 4,064
Impaired loans with no related allowance, Interest Income | 69 | 83
Impaired loans with a related allowance, Interest Income | 88 | 78
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with no related allowance, Average Recorded Investment | 603 | 3,640
Impaired loans with a related allowance, Average Recorded Investment | 4,961 | 2,374
Impaired loans with no related allowance, Interest Income |  | 18
Impaired loans with a related allowance, Interest Income | 38 | $ 18
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Impaired loans with a related allowance, Average Recorded Investment | $ 346 |

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524 + Details
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