Loans Loan Categories and Past Due Loans(Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	$ 3,075	$ 4,456	$ 6,042
Loans Past Due 60 - 89 Days	4,580	6,196	4,122
Loans Past Due 90 or more Days	4,754	4,012	2,263
Total Loans Past Due	12,409	14,664	12,427
Current Loans	1,230,961	1,157,677	1,140,524
Total Loans	1,243,370	1,172,341	1,152,951
Loans 90 Days or More Past Due and Still Accruing Interest	927	920	150
Nonaccrual Loans	6,171	6,633	6,088
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	595	1,045	831
Loans Past Due 60 - 89 Days	750	1,588	1,764
Loans Past Due 90 or more Days	53	494	216
Total Loans Past Due	1,398	3,127	2,811
Current Loans	85,719	102,409	97,612
Total Loans	87,117	105,536	100,423
Loans 90 Days or More Past Due and Still Accruing Interest	0	126	0
Nonaccrual Loans	269	1,787	1,750
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	33,960	29,149	27,265
Total Loans	33,960	29,149	27,265
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	0	534	271
Loans Past Due 60 - 89 Days	1,173	1,332	1,051
Loans Past Due 90 or more Days	1,847	1,871	621
Total Loans Past Due	3,020	3,737	1,943
Current Loans	260,084	241,440	233,238
Total Loans	263,104	245,177	235,181
Loans 90 Days or More Past Due and Still Accruing Interest	0	378	0
Nonaccrual Loans	1,930	2,026	1,156
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	50	43	20
Loans Past Due 60 - 89 Days	4	17	0
Loans Past Due 90 or more Days	0	0	0
Total Loans Past Due	54	60	20
Current Loans	7,516	6,624	6,837
Total Loans	7,570	6,684	6,857
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	3	1	1
Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	2,230	2,427	2,675
Loans Past Due 60 - 89 Days	654	793	485
Loans Past Due 90 or more Days	133	185	148
Total Loans Past Due	3,017	3,405	3,308
Current Loans	389,335	345,695	339,922
Total Loans	392,352	349,100	343,230
Loans 90 Days or More Past Due and Still Accruing Interest	11	42	0
Nonaccrual Loans	240	419	419
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	200	407	2,245
Loans Past Due 60 - 89 Days	1,999	2,466	822
Loans Past Due 90 or more Days	2,721	1,462	1,278
Total Loans Past Due	4,920	4,335	4,345
Current Loans	454,347	432,360	435,650
Total Loans	459,267	436,695	439,995
Loans 90 Days or More Past Due and Still Accruing Interest	916	374	150
Nonaccrual Loans	$ 3,729	$ 2,400	$ 2,762