Loans Loan Categories and Past Due Loans(Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	$ 4,456	$ 5,953
Loans Past Due 60 - 89 Days	6,196	1,105
Loans Past Due 90 or More Days	4,012	5,218
Total Loans Past Due	14,664	12,276
Current Loans	1,157,677	1,119,181
Total Loans	1,172,341	1,131,457
Loans 90 or More Days Past Due and Still Accruing Interest	920	1,662
Nonaccrual Loans	6,633	4,528
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	1,045	538
Loans Past Due 60 - 89 Days	1,588	197
Loans Past Due 90 or More Days	494	17
Total Loans Past Due	3,127	752
Current Loans	102,409	99,039
Total Loans	105,536	99,791
Loans 90 or More Days Past Due and Still Accruing Interest	126	17
Nonaccrual Loans	1,787	6
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	0	0
Loans Past Due 60 - 89 Days	0	0
Loans Past Due 90 or More Days	0	0
Total Loans Past Due	0	0
Current Loans	29,149	11,083
Total Loans	29,149	11,083
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	0	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	534	284
Loans Past Due 60 - 89 Days	1,332	0
Loans Past Due 90 or More Days	1,871	1,825
Total Loans Past Due	3,737	2,109
Current Loans	241,440	230,040
Total Loans	245,177	232,149
Loans 90 or More Days Past Due and Still Accruing Interest	378	684
Nonaccrual Loans	2,026	1,503
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	43	75
Loans Past Due 60 - 89 Days	17	12
Loans Past Due 90 or More Days	0	6
Total Loans Past Due	60	93
Current Loans	6,624	6,225
Total Loans	6,684	6,318
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	1	6
Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	2,427	3,512
Loans Past Due 60 - 89 Days	793	670
Loans Past Due 90 or More Days	185	314
Total Loans Past Due	3,405	4,496
Current Loans	345,695	317,879
Total Loans	349,100	322,375
Loans 90 or More Days Past Due and Still Accruing Interest	42	56
Nonaccrual Loans	419	431
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	407	1,544
Loans Past Due 60 - 89 Days	2,466	226
Loans Past Due 90 or More Days	1,462	3,056
Total Loans Past Due	4,335	4,826
Current Loans	432,360	454,915
Total Loans	436,695	459,741
Loans 90 or More Days Past Due and Still Accruing Interest	374	905
Nonaccrual Loans	$ 2,400	$ 2,582