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Loans and Allowance for Loan Losses - Schedule of Number of Loans Modified Troubled Debt Restructuring by Loan Portfolio (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) SecurityLoan	Dec. 31, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	11	18
Pre-Modification Outstanding Principal Balance	$ 2,649	$ 5,089
Post-Modification Principal Balance	$ 1,947	$ 3,929
Subsequent default number of loans | SecurityLoan		2
Recorded Investment		$ 886
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	3	4
Pre-Modification Outstanding Principal Balance	$ 2,220	$ 3,282
Post-Modification Principal Balance	$ 1,698	$ 2,365
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	4	4
Pre-Modification Outstanding Principal Balance	$ 200	$ 200
Post-Modification Principal Balance	$ 103	$ 156
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	2	6
Pre-Modification Outstanding Principal Balance	$ 113	$ 1,448
Post-Modification Principal Balance	$ 52	$ 1,299
Subsequent default number of loans | SecurityLoan		2
Recorded Investment		$ 886
Commercial and Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	2	4
Pre-Modification Outstanding Principal Balance	$ 116	$ 159
Post-Modification Principal Balance	$ 94	$ 109

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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-Publisher FASB
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-Topic 310
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 34
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