Loans and Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Composition of the loan portfolio
Total loans	$ 419,768	$ 394,254
Commercial
Composition of the loan portfolio
Total loans	$ 96,281	$ 84,613
Percentage of loans	22.90%	21.50%
Commercial real estate
Composition of the loan portfolio
Total loans	$ 238,692	$ 237,137
Percentage of loans	56.90%	60.10%
Residential real estate
Composition of the loan portfolio
Total loans	$ 57,008	$ 45,414
Percentage of loans	13.60%	11.50%
Consumer | Home equity
Composition of the loan portfolio
Total loans	$ 25,061	$ 23,334
Percentage of loans	6.00%	5.90%
Consumer | Other
Composition of the loan portfolio
Total loans	$ 2,726	$ 3,756
Percentage of loans	0.60%	1.00%