Loans and the Allowance for Loan Losses - Non-performing Loans Disaggregated by Loan Category (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]
Troubled debt restructurings	$ 105,000	$ 117,000
Non-Performing Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	952,000	525,000
Troubled debt restructurings	105,000	117,000
Total	1,057,000	642,000
Non-Performing Loans | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	507,000	512,000
Troubled debt restructurings	105,000	111,000
Total	612,000	623,000
Non-Performing Loans | Commercial Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	135,000
Total	135,000
Non-Performing Loans | Home Equity
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	12,000	13,000
Total	12,000	13,000
Non-Performing Loans | Commercial & Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	298,000
Troubled debt restructurings		6,000
Total	$ 298,000	$ 6,000