Loans Loan Categories and Past Due Loans(Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	$ 4,604	$ 5,953	$ 3,569
Loans Past Due 60 - 89 Days	2,906	1,105	3,769
Loans Past Due 90 or more Days	2,634	5,218	2,908
Total Loans Past Due	10,144	12,276	10,246
Current Loans	1,136,497	1,119,181	1,109,850
Total Loans	1,146,641	1,131,457	1,120,096
Loans 90 Days or More Past Due and Still Accruing Interest	504	1,662	555
Nonaccrual Loans	6,822	4,528	4,990
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	441	538	268
Loans Past Due 60 - 89 Days	1,779	197	251
Loans Past Due 90 or more Days	0	17	250
Total Loans Past Due	2,220	752	769
Current Loans	99,074	99,039	96,432
Total Loans	101,294	99,791	97,201
Loans 90 Days or More Past Due and Still Accruing Interest	0	17	0
Nonaccrual Loans	1,675	6	319
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	0	0	0
Loans Past Due 60 - 89 Days	0	0	0
Loans Past Due 90 or more Days	0	0	0
Total Loans Past Due	0	0	0
Current Loans	17,628	11,083	6,907
Total Loans	17,628	11,083	6,907
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	0	0	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	371	284	76
Loans Past Due 60 - 89 Days	0	0	1,106
Loans Past Due 90 or more Days	692	1,825	169
Total Loans Past Due	1,063	2,109	1,351
Current Loans	234,798	230,040	227,191
Total Loans	235,861	232,149	228,542
Loans 90 Days or More Past Due and Still Accruing Interest	27	684	110
Nonaccrual Loans	1,511	1,503	1,173
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	13	75	58
Loans Past Due 60 - 89 Days	5	12	4
Loans Past Due 90 or more Days	0	6	0
Total Loans Past Due	18	93	62
Current Loans	6,525	6,225	5,919
Total Loans	6,543	6,318	5,981
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	1	6	0
Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	2,225	3,512	2,853
Loans Past Due 60 - 89 Days	483	670	843
Loans Past Due 90 or more Days	124	314	220
Total Loans Past Due	2,832	4,496	3,916
Current Loans	331,266	317,879	312,776
Total Loans	334,098	322,375	316,692
Loans 90 Days or More Past Due and Still Accruing Interest	0	56	23
Nonaccrual Loans	536	431	489
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	1,554	1,544	314
Loans Past Due 60 - 89 Days	639	226	1,565
Loans Past Due 90 or more Days	1,818	3,056	2,269
Total Loans Past Due	4,011	4,826	4,148
Current Loans	447,206	454,915	460,625
Total Loans	451,217	459,741	464,773
Loans 90 Days or More Past Due and Still Accruing Interest	477	905	422
Nonaccrual Loans	$ 3,099	$ 2,582	$ 3,009