Loans And Allowance For Loan Losses (Age Analysis Of Past Due Loans And Nonaccrual Loans) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due	$ 2,158	$ 111
Accruing Loans 90 Days or More Past Due	680	2,700
Total Accruing Loans Past Due	2,838	2,811
Nonaccrual Loans	8,929	9,298
Current Loans	108,467	118,363
Total Loans	120,234	130,472
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due	7	1
Accruing Loans 90 Days or More Past Due		2,700
Total Accruing Loans Past Due	7	2,701
Nonaccrual Loans
Current Loans	2,770	3,172
Total Loans	2,777	5,873
Construction And Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due
Nonaccrual Loans	3,186	3,197
Current Loans	5,506	5,671
Total Loans	8,692	8,868
Residential, 1-4 Families [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due	75
Accruing Loans 90 Days or More Past Due	680
Total Accruing Loans Past Due	755
Nonaccrual Loans	139	612
Current Loans	27,181	25,956
Total Loans	28,075	26,568
Residential, 5 Or More Families [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due
Nonaccrual Loans
Current Loans	3,746	4,717
Total Loans	3,746	4,717
Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due
Nonaccrual Loans
Current Loans	1,275	1,306
Total Loans	1,275	1,306
Nonfarm, Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due	2,070	107
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due	2,070	107
Nonaccrual Loans	5,604	5,489
Current Loans	63,007	70,283
Total Loans	70,681	75,879
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due
Nonaccrual Loans
Current Loans	39	9
Total Loans	39	9
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due	6	3
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due	6	3
Nonaccrual Loans
Current Loans	931	2,484
Total Loans	937	2,487
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans 30-89 Days Past Due
Accruing Loans 90 Days or More Past Due
Total Accruing Loans Past Due
Nonaccrual Loans
Current Loans	4,012	4,765
Total Loans	$ 4,012	$ 4,765