Loans Loan Categories and Past Due Loans(Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	$ 4,550	$ 4,456	$ 4,604
Loans Past Due 60 - 89 Days	3,390	6,196	2,906
Loans Past Due 90 or more Days	3,615	4,012	2,634
Total Loans Past Due	11,555	14,664	10,144
Current Loans	1,193,179	1,157,677	1,136,497
Total Loans	1,204,734	1,172,341	1,146,641
Loans 90 Days or More Past Due and Still Accruing Interest	760	920	504
Nonaccrual Loans	5,591	6,633	6,822
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	765	1,045	441
Loans Past Due 60 - 89 Days	655	1,588	1,779
Loans Past Due 90 or more Days	220	494	0
Total Loans Past Due	1,640	3,127	2,220
Current Loans	85,909	102,409	99,074
Total Loans	87,549	105,536	101,294
Loans 90 Days or More Past Due and Still Accruing Interest	154	126	0
Nonaccrual Loans	299	1,787	1,675
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	30,980	29,149	17,628
Total Loans	30,980	29,149	17,628
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	262	534	371
Loans Past Due 60 - 89 Days	997	1,332	0
Loans Past Due 90 or more Days	1,875	1,871	692
Total Loans Past Due	3,134	3,737	1,063
Current Loans	256,665	241,440	234,798
Total Loans	259,799	245,177	235,861
Loans 90 Days or More Past Due and Still Accruing Interest	0	378	27
Nonaccrual Loans	1,941	2,026	1,511
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	16	43	13
Loans Past Due 60 - 89 Days	15	17	5
Loans Past Due 90 or more Days	4	0	0
Total Loans Past Due	35	60	18
Current Loans	7,421	6,624	6,525
Total Loans	7,456	6,684	6,543
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	7	1	1
Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	2,346	2,427	2,225
Loans Past Due 60 - 89 Days	527	793	483
Loans Past Due 90 or more Days	114	185	124
Total Loans Past Due	2,987	3,405	2,832
Current Loans	372,073	345,695	331,266
Total Loans	375,060	349,100	334,098
Loans 90 Days or More Past Due and Still Accruing Interest	0	42	0
Nonaccrual Loans	264	419	536
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30 - 59 Days	1,161	407	1,554
Loans Past Due 60 - 89 Days	1,196	2,466	639
Loans Past Due 90 or more Days	1,402	1,462	1,818
Total Loans Past Due	3,759	4,335	4,011
Current Loans	440,131	432,360	447,206
Total Loans	443,890	436,695	451,217
Loans 90 Days or More Past Due and Still Accruing Interest	606	374	477
Nonaccrual Loans	$ 3,080	$ 2,400	$ 3,099