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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, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	$ 22,718	$ 16,048
Allowance for Loans Individually Evaluated	2,371	1,482
Loans Collectively Evaluated for Impairment	1,641,181	1,611,085
Allowance for Loans Collectively Evaluated	17,808	18,687
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	15,495	10,310
Allowance for Loans Individually Evaluated	1,692	1,045
Loans Collectively Evaluated for Impairment	895,984	878,292
Allowance for Loans Collectively Evaluated	11,440	11,965
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	53,437	51,608
Allowance for Loans Collectively Evaluated	1,119	1,151
Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	89,885	85,353
Allowance for Loans Collectively Evaluated	504	690
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	95,486	98,880
Allowance for Loans Collectively Evaluated	1,535	1,917
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	1,401	833
Allowance for Loans Individually Evaluated	124	45
Loans Collectively Evaluated for Impairment	147,209	135,223
Allowance for Loans Collectively Evaluated	3,245	3,183
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	14,094	9,477
Allowance for Loans Individually Evaluated	1,568	1,000
Loans Collectively Evaluated for Impairment	478,839	475,353
Allowance for Loans Collectively Evaluated	4,825	4,805
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	2,945	1,642
Allowance for Loans Collectively Evaluated	22	13
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	28,183	30,233
Allowance for Loans Collectively Evaluated	190	206
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	7,223	5,738
Allowance for Loans Individually Evaluated	679	437
Loans Collectively Evaluated for Impairment	665,775	656,809
Allowance for Loans Collectively Evaluated	5,678	6,052
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	126,691	134,006
Allowance for Loans Collectively Evaluated	1,091	1,330
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	6,874	5,738
Allowance for Loans Individually Evaluated	672	437
Loans Collectively Evaluated for Impairment	495,761	489,820
Allowance for Loans Collectively Evaluated	4,297	4,498
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	349
Allowance for Loans Individually Evaluated	7
Loans Collectively Evaluated for Impairment	43,323	32,983
Allowance for Loans Collectively Evaluated	290	224
Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	79,422	75,984
Allowance for Loans Collectively Evaluated	690	670
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	72,084	69,429
Allowance for Loans Collectively Evaluated	690	670
Consumer and Other | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	$ 7,338	$ 6,555

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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+ 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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