Loans And Allowance For Loan Losses (Allocation Of Allowance For Loan Losses Based On Loans Evaluated Specifically For Impairment And Loans Evaluated Collectively) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Ending balance of allowance to total allowance	100.00%	100.00%
Individually Evaluate for Impairment	$ 1,845	$ 1,258
Ending Balance Collectively Evaluated Impairment	1,153	1,609
Total	2,998	2,867
Individually Evaluate For Impairment [Member]
Financing Receivable, Impaired [Line Items]
Ending balance of allowance to total allowance	61.54%	43.88%
Ending Balance Collectively Evaluated Impairment [Member]
Financing Receivable, Impaired [Line Items]
Ending balance of allowance to total allowance	38.46%	56.12%
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment		12
Ending Balance Collectively Evaluated Impairment	32	23
Total	32	35
Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment	1,295	584
Ending Balance Collectively Evaluated Impairment	160	659
Total	1,455	1,243
Residential, 1-4 Families [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment		73
Ending Balance Collectively Evaluated Impairment	105	82
Total	105	155
Residential, 5 Or More Families [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment
Ending Balance Collectively Evaluated Impairment
Total
Farmland [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment
Ending Balance Collectively Evaluated Impairment
Total
Nonfarm, Nonresidential [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment	550	589
Ending Balance Collectively Evaluated Impairment	674	666
Total	1,224	1,255
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment
Ending Balance Collectively Evaluated Impairment	3	3
Total	3	3
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment
Ending Balance Collectively Evaluated Impairment	50	50
Total	50	50
Other [Member]
Financing Receivable, Impaired [Line Items]
Individually Evaluate for Impairment
Ending Balance Collectively Evaluated Impairment	129	126
Total	$ 129	$ 126