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Allowance for Loan Losses and Recorded Investment in Loans, Evaluated for Impairment Excluding PCI Loans, by Loan Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | $ 10,082 | $ 22,718
Allowance for Loans Individually Evaluated | 819 | 2,371
Loans Collectively Evaluated for Impairment | 1,814,437 | 1,641,181
Allowance for Loans Collectively Evaluated | 17,117 | 17,808
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 4,626 | 15,495
Allowance for Loans Individually Evaluated | 49 | 1,692
Loans Collectively Evaluated for Impairment | 1,065,126 | 895,984
Allowance for Loans Collectively Evaluated | 11,641 | 11,440
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 60,281 | 53,437
Allowance for Loans Collectively Evaluated | 889 | 1,119
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 93,099 | 89,885
Allowance for Loans Collectively Evaluated | 495 | 504
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 281 |
Loans Collectively Evaluated for Impairment | 133,947 | 95,486
Allowance for Loans Collectively Evaluated | 1,157 | 1,535
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 1,910 | 1,401
Allowance for Loans Individually Evaluated | 31 | 124
Loans Collectively Evaluated for Impairment | 139,711 | 147,209
Allowance for Loans Collectively Evaluated | 2,721 | 3,245
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 1,454 | 14,094
Allowance for Loans Individually Evaluated |  | 1,568
Loans Collectively Evaluated for Impairment | 600,915 | 478,839
Allowance for Loans Collectively Evaluated | 6,185 | 4,825
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 6,028 | 2,945
Allowance for Loans Collectively Evaluated | 43 | 22
Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 981 |
Allowance for Loans Individually Evaluated | 18 |
Loans Collectively Evaluated for Impairment | 31,145 | 28,183
Allowance for Loans Collectively Evaluated | 151 | 190
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 5,456 | 7,223
Allowance for Loans Individually Evaluated | 770 | 679
Loans Collectively Evaluated for Impairment | 667,816 | 665,775
Allowance for Loans Collectively Evaluated | 4,717 | 5,678
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 122,000 | 126,691
Allowance for Loans Collectively Evaluated | 895 | 1,091
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 5,120 | 6,874
Allowance for Loans Individually Evaluated | 770 | 672
Loans Collectively Evaluated for Impairment | 501,617 | 495,761
Allowance for Loans Collectively Evaluated | 3,594 | 4,297
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Individually Evaluated for Impairment | 336 | 349
Allowance for Loans Individually Evaluated |  | 7
Loans Collectively Evaluated for Impairment | 44,199 | 43,323
Allowance for Loans Collectively Evaluated | 228 | 290
Consumer and Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 81,495 | 79,422
Allowance for Loans Collectively Evaluated | 759 | 690
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 77,524 | 72,084
Allowance for Loans Collectively Evaluated | 759 | 690
Consumer and Other | Other Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | $ 3,971 | $ 7,338

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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