Loans and Allowance for Loan Losses (Details 5) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary of credit quality indicators by internally assigned grade
Total loans	$ 481,914	$ 487,490
Commercial
Summary of credit quality indicators by internally assigned grade
Total loans	72,978	113,341
Commercial | Pass
Summary of credit quality indicators by internally assigned grade
Total loans	53,493	100,436
Commercial | Special Mention
Summary of credit quality indicators by internally assigned grade
Total loans	8,397	4,836
Commercial | Substandard
Summary of credit quality indicators by internally assigned grade
Total loans	11,088	8,069
Commercial real estate
Summary of credit quality indicators by internally assigned grade
Total loans	310,019	283,135
Commercial real estate | Pass
Summary of credit quality indicators by internally assigned grade
Total loans	277,352	252,960
Commercial real estate | Special Mention
Summary of credit quality indicators by internally assigned grade
Total loans	25,942	24,307
Commercial real estate | Substandard
Summary of credit quality indicators by internally assigned grade
Total loans	$ 6,725	$ 5,868