Allowance For Loan Loss Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	$ 6,320		$ 5,532
Financing Receivable, Collectively Evaluated for Impairment	385,444		370,158
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	449		1,964
Financing Receivable, Individually Evaluated for Impairment	5,393		10,397
Allowance for loan losses	6,769	6,723	7,496
Loans and Leases Receivable, Gross, Carrying Amount	390,837	398,426	380,555
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	569		845
Financing Receivable, Collectively Evaluated for Impairment	55,576		56,598
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	160		206
Allowance for loan losses	569		845
Loans and Leases Receivable, Gross, Carrying Amount	55,736	59,334	56,804
Construction And Land Development Loans [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,498		1,118
Financing Receivable, Collectively Evaluated for Impairment	39,489		29,960
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	121		321
Financing Receivable, Individually Evaluated for Impairment	1,615		4,390
Allowance for loan losses	1,619		1,439
Loans and Leases Receivable, Gross, Carrying Amount	41,104	37,631	34,350
Commercial Real Estate Loans, Total [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,327		2,509
Financing Receivable, Collectively Evaluated for Impairment	176,492		169,051
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	244		1,307
Financing Receivable, Individually Evaluated for Impairment	2,501		4,214
Allowance for loan losses	3,571		3,816
Loans and Leases Receivable, Gross, Carrying Amount	178,993	183,611	173,265
Residential Real Estate Loans, Total [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	801		996
Financing Receivable, Collectively Evaluated for Impairment	101,861		103,596
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	84		336
Financing Receivable, Individually Evaluated for Impairment	1,117		1,587
Allowance for loan losses	885		1,332
Loans and Leases Receivable, Gross, Carrying Amount	102,978	105,631	105,183
Consumer Installment and Revolving Loans [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	125		64
Financing Receivable, Collectively Evaluated for Impairment	12,026		10,953
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		0
Allowance for loan losses	125		64
Loans and Leases Receivable, Gross, Carrying Amount	$ 12,026	$ 12,219	$ 10,953