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Nonaccrual Loans by Loan Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	$ 16,462	$ 18,494
Commercial Loans | Construction Development And Other Land
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	104	93
Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	345	16
Commercial Loans | Multi-family Residential
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	294	84
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	1,266	1,879
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	3,325	7,189
Commercial Loans | Farmland Loan
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	1,591	234
Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	1,105	1,238
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	8,033	7,341
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	336	349
Consumer and Other | Consumer Loan
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	63	71
Non Covered Loans
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	15,854	17,847
Non Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	72	39
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	332
Non Covered Loans | Commercial Loans | Multi-family Residential
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	294	84
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	1,242	1,850
Non Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	3,295	7,150
Non Covered Loans | Commercial Loans | Farmland Loan
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	1,591	234
Non Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	705	825
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	7,924	7,245
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	336	349
Non Covered Loans | Consumer and Other | Consumer Loan
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	63	71
Covered Loans
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	608	647
Covered Loans | Commercial Loans | Construction Development And Other Land
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	32	54
Covered Loans | Commercial Loans | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	13	16
Covered Loans | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	24	29
Covered Loans | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	30	39
Covered Loans | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	400	413
Covered Loans | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total nonaccrual loans	$ 109	$ 96

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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