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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Total TDRs		$ 15,301	$ 15,088
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		950	1,088
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs		4,600	4,826
Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs		170	47
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		8,989	8,883
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs		592	244
Nonaccrual
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	1,339	554
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	130
Nonaccrual | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]		83
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]	733	471
Nonaccrual | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs	[1]	349
Accrual
Financing Receivable, Impaired [Line Items]
Total TDRs		13,962	14,534
Accrual | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		820	1,088
Accrual | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs		4,600	4,743
Accrual | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs		43	47
Accrual | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs		8,256	8,412
Accrual | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs		$ 243	$ 244
[1] TDRs on nonaccrual status are included in the total nonaccrual loan balance disclosed in the table above.

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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

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