Loans and Allowance for Loan Losses - Non-performing Loans Disaggregated by Loan Category (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]
Troubled debt restructurings	$ 227,000	$ 117,000
Non-Performing Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	4,160,000	525,000
Loans past due >90 days, but still accruing	1,264,000
Troubled debt restructurings	227,000	117,000
Total	5,651,000	642,000
Non-Performing Loans | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	1,298,000	512,000
Loans past due >90 days, but still accruing	527,000
Troubled debt restructurings	99,000	111,000
Total	1,924,000	623,000
Non-Performing Loans | Commercial Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	2,800,000
Loans past due >90 days, but still accruing	486,000
Total	3,286,000
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	50,000
Loans past due >90 days, but still accruing	251,000
Troubled debt restructurings	128,000	6,000
Total	$ 429,000	$ 6,000