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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	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	$ 16,798	$ 22,718
Allowance for Loans Individually Evaluated	2,386	2,371
Loans Collectively Evaluated for Impairment	1,748,630	1,641,181
Allowance for Loans Collectively Evaluated	18,701	17,808
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	11,182	15,495
Allowance for Loans Individually Evaluated	1,626	1,692
Loans Collectively Evaluated for Impairment	993,178	895,984
Allowance for Loans Collectively Evaluated	12,063	11,440
Commercial Loans | Construction Development And Other Land
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	63,042	53,437
Allowance for Loans Collectively Evaluated	924	1,119
Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	93,666	89,885
Allowance for Loans Collectively Evaluated	545	504
Commercial Loans | Multi-family Residential
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	109,651	95,486
Allowance for Loans Collectively Evaluated	1,543	1,535
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	1,135	1,401
Allowance for Loans Individually Evaluated	108	124
Loans Collectively Evaluated for Impairment	151,001	147,209
Allowance for Loans Collectively Evaluated	3,314	3,245
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	10,047	14,094
Allowance for Loans Individually Evaluated	1,518	1,568
Loans Collectively Evaluated for Impairment	543,238	478,839
Allowance for Loans Collectively Evaluated	5,495	4,825
Commercial Loans | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	4,447	2,945
Allowance for Loans Collectively Evaluated	32	22
Commercial Loans | Farmland Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	28,133	28,183
Allowance for Loans Collectively Evaluated	210	190
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	5,616	7,223
Allowance for Loans Individually Evaluated	760	679
Loans Collectively Evaluated for Impairment	672,161	665,775
Allowance for Loans Collectively Evaluated	5,865	5,678
Consumer Real Estate | Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	123,943	126,691
Allowance for Loans Collectively Evaluated	1,129	1,091
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	5,273	6,874
Allowance for Loans Individually Evaluated	760	672
Loans Collectively Evaluated for Impairment	505,212	495,761
Allowance for Loans Collectively Evaluated	4,460	4,297
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Recorded Investment [Line Items]
Loans Individually Evaluated for Impairment	343	349
Allowance for Loans Individually Evaluated		7
Loans Collectively Evaluated for Impairment	43,006	43,323
Allowance for Loans Collectively Evaluated	276	290
Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	83,291	79,422
Allowance for Loans Collectively Evaluated	773	690
Consumer and Other | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	75,784	72,084
Allowance for Loans Collectively Evaluated	773	690
Consumer and Other | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Collectively Evaluated for Impairment	$ 7,507	$ 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=66008989&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=66008989&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=66008989&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=66008989&loc=SL6953423-111524

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