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	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	$ 3,395	$ 4,273
Past due 90 days or more and still accruing	878	496
Non- Accrual	2,808	5,125
Total Past Due and Non- Accrual	7,081	9,894
Total Loans	388,062	385,022
Real Estate Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	222	70
Past due 90 days or more and still accruing	67	22
Non- Accrual	1,615	945
Total Past Due and Non- Accrual	1,904	1,037
Total Loans	56,761	63,357
Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	2,236	2,189
Past due 90 days or more and still accruing	763	311
Non- Accrual	455	984
Total Past Due and Non- Accrual	3,454	3,484
Total Loans	129,149	117,692
Real Estate-non farm non residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	509	1,662
Past due 90 days or more and still accruing		144
Non- Accrual	596	2,877
Total Past Due and Non- Accrual	1,105	4,683
Total Loans	135,660	138,943
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	282	138
Past due 90 days or more and still accruing		19
Non- Accrual	137	246
Total Past Due and Non- Accrual	419	403
Total Loans	51,616	48,385
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	146	214
Past due 90 days or more and still accruing	48
Non- Accrual	5	73
Total Past Due and Non- Accrual	199	287
Total Loans	$ 14,876	$ 16,645