Loans and Allowance for Loan Losses - Schedule of Number of Loans Modified Troubled Debt Restructuring by Loan Portfolio (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans	29	40
Pre-Modification Outstanding Principal Balance	$ 8,210	$ 12,025
Post-Modification Principal Balance	4,859	7,666
Subsequent default number of loans	3	6
Recorded Investment	988	1,639
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	8	10
Pre-Modification Outstanding Principal Balance	5,910	7,551
Post-Modification Principal Balance	2,827	3,837
Subsequent default number of loans	0	2
Recorded Investment	0	566
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	9	17
Pre-Modification Outstanding Principal Balance	452	1,375
Post-Modification Principal Balance	383	1,067
Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	8	9
Pre-Modification Outstanding Principal Balance	1,688	2,683
Post-Modification Principal Balance	1,533	2,418
Subsequent default number of loans	3	4
Recorded Investment	988	1,073
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	4	4
Pre-Modification Outstanding Principal Balance	160	416
Post-Modification Principal Balance	$ 116	$ 344

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Number of 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 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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