Summary of Loans Classified as Past Due in Excess of Thirty Days or More and Loans Classified as Non-Accrual (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	$ 3,697	$ 7,163
Past Due 90 Days Or More and Still Accruing	92	669
Non- Accrual	6,513	6,056	$ 64
Total Past Due and Non- Accrual	10,302	13,888
Total Loans	731,037	704,531
Real Estate-construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	323	428
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	3,246	2,747
Total Past Due and Non- Accrual	3,569	3,175
Total Loans	93,152	84,935
Real Estate-mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	838	3,208
Past Due 90 Days Or More and Still Accruing	92	208
Non- Accrual	2,059	2,164
Total Past Due and Non- Accrual	2,989	5,580
Total Loans	259,610	256,406
Real Estate-non farm non residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	1,985	3,408
Past Due 90 Days Or More and Still Accruing	0	461
Non- Accrual	1,064	1,102
Total Past Due and Non- Accrual	3,049	4,971
Total Loans	245,537	238,601
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	500	29
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	109	5
Total Past Due and Non- Accrual	609	34
Total Loans	116,352	106,109
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	51	90
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	35	38
Total Past Due and Non- Accrual	86	128
Total Loans	$ 16,386	$ 18,480