Summary of Loans Classified as Past Due in Excess of Thirty Days or More and Loans Classified as Non-Accrual (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	$ 2,505	$ 7,163
Past Due 90 Days Or More and Still Accruing	6	669
Non- Accrual	7,949	6,056
Total Past Due and Non- Accrual	10,460	13,888
Total Loans	746,588	704,531
Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	0
Past Due 90 Days Or More and Still Accruing	0
Non- Accrual	0
Total Past Due and Non- Accrual	0
Total Loans	2,303	0
Real Estate-construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	424	428
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	3,244	2,747
Total Past Due and Non- Accrual	3,668	3,175
Total Loans	85,769	84,935
Real Estate-mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	1,009	3,208
Past Due 90 Days Or More and Still Accruing	6	208
Non- Accrual	2,141	2,164
Total Past Due and Non- Accrual	3,156	5,580
Total Loans	265,762	256,406
Real Estate-non farm non residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	674	3,408
Past Due 90 Days Or More and Still Accruing	0	461
Non- Accrual	2,425	1,102
Total Past Due and Non- Accrual	3,099	4,971
Total Loans	251,631	238,601
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	305	29
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	106	5
Total Past Due and Non- Accrual	411	34
Total Loans	123,872	106,109
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	93	90
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	33	38
Total Past Due and Non- Accrual	126	128
Total Loans	$ 17,251	$ 18,480