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Loans and Related Allowance for Credit Losses (Narrative) (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
item
loan
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 390,014,000   $ 400,590,000
Troubled debt restructured loan 689,000   703,000
Recorded charge-offs $ 21,000 $ 73,000  
Credit quality indicators information This analysis includes loans to commercial customers with an aggregate loan exposure greater than $500,000 and for lines of credit in excess of $50,000.    
Loans and Leases Receivable, Net of Deferred Income $ 390,014,000   400,590,000
Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 16,621,000   16,377,000
Recorded charge-offs   15,000  
Loans and Leases Receivable, Net of Deferred Income $ 16,621,000   16,377,000
Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded charge-offs   $ 47,000  
Home Equity Lines of Credit [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Maximum loan-to-value ratio 90.00%    
Home Equity Installment Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Maximum loan-to-value ratio 80.00%    
Real Estate Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 118,265,000   126,613,000
Maximum loan-to-value ratio 80.00%    
Loans and Leases Receivable, Net of Deferred Income $ 118,265,000   126,613,000
Real Estate Portfolio Segment [Member] | Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Maximum loan-to-value ratio 80.00%    
Loan balance in the process of foreclosure $ 320,000   248,000
Consumer Portfolio Segment [Member] | Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 147,226,000   150,538,000
Loans and Leases Receivable, Net of Deferred Income 147,226,000   150,538,000
Accruing Troubled Debt Restructurings [Member] | Real Estate Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Troubled debt restructured loan 302,000    
Accruing Troubled Debt Restructurings [Member] | Consumer Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Troubled debt restructured loan     306,000
Accruing Troubled Debt Restructurings [Member] | Consumer Portfolio Segment [Member] | Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Troubled debt restructured loan 387,000   $ 397,000
Payment Deferral [Member] | Covid-19 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 566,000    
Number of borrowers approved for designated deferrals | loan 8    
Loans and Leases Receivable, Net of Deferred Income $ 566,000    
Number of delinquent borrowers approved for designated deferrals | item 0