Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$ 5,504		$ 5,504		$ 5,190
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,918)		(1,918)		(1,633)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,586		3,586		3,557
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,427		5,427		8,476
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(382)		(382)		(1,047)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,045		5,045		7,429
Impaired Financing Receivable, With Related Allowance, Related Allowance	842		842		1,221
Impaired Financing Receivable, Unpaid Principal Balance	10,931		10,931		13,666
Impaired Financing Receivable, Charge-off And Payments Applied	(2,300)		(2,300)		(2,680)
Impaired Financing Receivable, Recorded Investment	8,631		8,631		10,986
Impaired Financing Receivable, Related Allowance	842		842		1,221
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	9,746	9,901	10,309	10,617
Impaired Financing Receivable, Interest Income, Accrual Method	22	3	43	8
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	195		195		216
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	195		195		216
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	197	237	205	395
Impaired Financing Receivable, Interest Income, Accrual Method	4	0	8	2
Construction And Land Development Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,879		2,879		3,958
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,601)		(1,601)		(1,572)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,278		1,278		2,386
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,817		2,817		2,882
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(237)		(237)		(173)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,580		2,580		2,709
Impaired Financing Receivable, Related Allowance	366		366		147
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	4,185	3,790	4,595	3,952
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,919		1,919		361
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(256)		(256)		(11)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,663		1,663		350
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	916		916		2,255
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(29)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	916		916		2,226
Impaired Financing Receivable, Related Allowance	151		151		544
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	2,561	1,651	2,566	1,720
Impaired Financing Receivable, Interest Income, Accrual Method	18	3	35	6
Commercial Real Estate Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	511		511		655
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(61)		(61)		(50)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	450		450		605
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		1,242
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(41)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		1,201
Impaired Financing Receivable, Related Allowance	0		0		264
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,245	2,701	1,500	2,737
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,430		2,430		1,016
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(317)		(317)		(61)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,113		2,113		955
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	916		916		3,497
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(70)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	916		916		3,427
Impaired Financing Receivable, Related Allowance	151		151		808
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	3,806	4,352	4,066	4,457
Impaired Financing Receivable, Interest Income, Accrual Method	18	3	35	6
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	980		980		1,707
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(125)		(125)		(797)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	855		855		910
Impaired Financing Receivable, Related Allowance	50		50		103
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	863	1,522	881	1,762
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	714		714		390
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(20)		(20)		(7)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	694		694		383
Impaired Financing Receivable, Related Allowance	275		275		163
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	695	0	562	51
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Residential Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,694		1,694		2,097
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(145)		(145)		(804)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,549		1,549		1,293
Impaired Financing Receivable, Related Allowance	325		325		266
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,558	1,522	1,443	1,813
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0