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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

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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- Definition

The balance of financing receivables 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 (h)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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