Loans, Credit exposure (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 794,045	$ 788,705
Threshold limit to consider loan as nonperforming	90 days
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	130,721	126,192
Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	44,029	48,812
Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	354,323	355,433
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	168,965	161,033
Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	89,688	91,313
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,319	5,922
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	129,226	125,072
Pass [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	35,940	39,417
Pass [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	341,474	340,094
Pass [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	155,507	146,875
Pass [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	86,850	89,066
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,414	922
Special Mention [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,635	2,287
Special Mention [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,349	10,321
Special Mention [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,192	10,731
Special Mention [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,777	1,060
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	81	198
Substandard [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,454	7,108
Substandard [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,500	5,018
Substandard [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,266	3,427
Substandard [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,061	1,187
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,307	5,856
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 12	$ 66