Summary of Loans Classified as Past Due in Excess of Thirty Days or More and Loans Classified as Non-Accrual (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	$ 2,567	$ 7,163
Past Due 90 Days Or More and Still Accruing	426	669
Non- Accrual	5,995	6,056	33,000
Total Past Due and Non- Accrual	8,988	13,888
Total Loans	716,359	704,531
Real Estate-construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	361	428
Past Due 90 Days Or More and Still Accruing	365	0
Non- Accrual	2,712	2,747
Total Past Due and Non- Accrual	3,438	3,175
Total Loans	93,168	84,935
Real Estate-mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	1,355	3,208
Past Due 90 Days Or More and Still Accruing	61	208
Non- Accrual	2,089	2,164
Total Past Due and Non- Accrual	3,505	5,580
Total Loans	254,844	256,406
Real Estate-non farm non residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	706	3,408
Past Due 90 Days Or More and Still Accruing	0	461
Non- Accrual	1,092	1,102
Total Past Due and Non- Accrual	1,798	4,971
Total Loans	242,969	238,601
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	82	29
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	65	5
Total Past Due and Non- Accrual	147	34
Total Loans	110,806	106,109
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	63	90
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	37	38
Total Past Due and Non- Accrual	100	128
Total Loans	$ 14,572	$ 18,480