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Loans Modified as Troubled Debt Restructurings by Loan Class and Accrual Status (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Total TDRs		$ 14,236	$ 15,301
Allowance for loan losses related to TDRs		670	590
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		930	950
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs		4,160	4,600
Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs		158	170
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		8,408	8,989
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs		580	592
Nonaccrual
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	1,284	1,339
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	38	130
Nonaccrual | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]		127
Nonaccrual | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	905	733
Nonaccrual | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	341	349
Accruing
Financing Receivable, Impaired [Line Items]
Total TDRs		12,952	13,962
Accruing | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		892	820
Accruing | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs		4,160	4,600
Accruing | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs		158	43
Accruing | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		7,503	8,256
Accruing | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs		$ 239	$ 243
[1] Nonaccrual TDRs are included in total nonaccrual loans disclosed in the nonaccrual table above.

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Allowance for loan losses.

+ References

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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