Loans And Allowance For Loan Losses (Summary Of Activity In Allowance For Loan Losses) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 2,867	$ 3,073
Charge-Offs	3,910	468
Recoveries	53	10
Provision	3,988	439
Ending Balance	2,998	3,054
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	35	79
Charge-Offs	2,694	50
Recoveries	9	1
Provision	2,682	47
Ending Balance	32	77
Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,243	1,729
Charge-Offs		123
Recoveries	10
Provision	202	349
Ending Balance	1,455	1,955
Residential, 1-4 Families [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	155	385
Charge-Offs	97	295
Recoveries	23	2
Provision	24	103
Ending Balance	105	195
Residential, 5 Or More Families [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance
Charge-Offs
Recoveries
Provision
Ending Balance
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance
Charge-Offs
Recoveries
Provision
Ending Balance
Nonfarm, Nonresidential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,255
Charge-Offs	1,119
Recoveries	8
Provision	1,080
Ending Balance	1,224
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3	3
Charge-Offs
Recoveries
Provision
Ending Balance	3	3
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	50	47
Charge-Offs
Recoveries		3
Provision
Ending Balance	50	50
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	126	120
Charge-Offs
Recoveries	3	2
Provision
Ending Balance	129	122
Nonfarm, Nonresidential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		710
Charge-Offs
Recoveries		2
Provision		(60)
Ending Balance		$ 652