Loans and Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Composition of the loan portfolio
Total loans	$ 481,914	$ 487,490
Commercial
Composition of the loan portfolio
Total loans	$ 72,978	$ 113,341
Percentage of loans	15.20%	23.30%
Commercial real estate
Composition of the loan portfolio
Total loans	$ 310,019	$ 283,135
Percentage of loans	64.30%	58.10%
Residential real estate
Composition of the loan portfolio
Total loans	$ 69,870	$ 62,071
Percentage of loans	14.50%	12.70%
Consumer | Home equity
Composition of the loan portfolio
Total loans	$ 25,654	$ 26,018
Percentage of loans	5.30%	5.30%
Consumer | Other
Composition of the loan portfolio
Total loans	$ 3,393	$ 2,925
Percentage of loans	0.70%	0.60%