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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	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	$ 20,373	$ 22,718
Allowance for Loans Individually Evaluated	2,321	2,371
Loans Collectively Evaluated for Impairment	1,701,212	1,641,181
Allowance for Loans Collectively Evaluated	18,122	17,808
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	14,468	15,495
Allowance for Loans Individually Evaluated	1,547	1,692
Loans Collectively Evaluated for Impairment	955,955	895,984
Allowance for Loans Collectively Evaluated	11,723	11,440
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	56,847	53,437
Allowance for Loans Collectively Evaluated	1,125	1,119
Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	93,251	89,885
Allowance for Loans Collectively Evaluated	510	504
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	111,388	95,486
Allowance for Loans Collectively Evaluated	1,585	1,535
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	1,137	1,401
Allowance for Loans Individually Evaluated	18	124
Loans Collectively Evaluated for Impairment	149,359	147,209
Allowance for Loans Collectively Evaluated	3,194	3,245
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	13,331	14,094
Allowance for Loans Individually Evaluated	1,529	1,568
Loans Collectively Evaluated for Impairment	513,781	478,839
Allowance for Loans Collectively Evaluated	5,097	4,825
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	3,684	2,945
Allowance for Loans Collectively Evaluated	28	22
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	27,645	28,183
Allowance for Loans Collectively Evaluated	184	190
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	5,905	7,223
Allowance for Loans Individually Evaluated	774	679
Loans Collectively Evaluated for Impairment	664,193	665,775
Allowance for Loans Collectively Evaluated	5,696	5,678
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	124,785	126,691
Allowance for Loans Collectively Evaluated	1,131	1,091
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	5,559	6,874
Allowance for Loans Individually Evaluated	771	672
Loans Collectively Evaluated for Impairment	498,696	495,761
Allowance for Loans Collectively Evaluated	4,293	4,297
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	346	349
Allowance for Loans Individually Evaluated	3	7
Loans Collectively Evaluated for Impairment	40,712	43,323
Allowance for Loans Collectively Evaluated	272	290
Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	81,064	79,422
Allowance for Loans Collectively Evaluated	703	690
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	73,613	72,084
Allowance for Loans Collectively Evaluated	703	690
Consumer and Other | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	$ 7,451	$ 7,338

X

- 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=49124121&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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=49124121&loc=SL6953423-111524

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- Definition

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+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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