Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary of consumer credit exposure
Total loans	$ 481,914	$ 487,490
Residential real estate
Summary of consumer credit exposure
Total loans	69,870	62,071
Consumer | Home equity
Summary of consumer credit exposure
Total loans	25,654	26,018
Consumer | Other
Summary of consumer credit exposure
Total loans	3,393	2,925
Performing | Residential real estate
Summary of consumer credit exposure
Total loans	69,530	61,824
Performing | Consumer | Home equity
Summary of consumer credit exposure
Total loans	25,533	25,889
Performing | Consumer | Other
Summary of consumer credit exposure
Total loans	3,393	2,925
Nonperforming | Residential real estate
Summary of consumer credit exposure
Total loans	340	247
Nonperforming | Consumer | Home equity
Summary of consumer credit exposure
Total loans	$ 121	$ 129