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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
property
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance $ 946,000   $ 1,055,000
Real Estate Acquired Through Foreclosure 1,572,000   1,115,000
Loans and Leases Receivable, Gross $ 905,649,000   $ 850,302,000
Historical loss factor 0.21%   0.42%
Proceeds from Sale of Foreclosed Assets $ 312,000 $ 696,000  
Multiple Properties [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real Estate Acquired Through Foreclosure $ 151,000    
Number Of Properties Disposed By Sale | property 3    
Commercial Rentals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 80,700,000    
Commercial Rentals [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 8.90%    
Hospitality Lodging Industry [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 65,000,000    
Hospitality Lodging Industry [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 7.20%    
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number Of Properties Under Foreclosure Proceedings | property 3    
Mortgage Loans in Process of Foreclosure, Amount $ 300,000    
Loans and Leases Receivable, Gross 230,624,000   $ 235,523,000
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 384,376,000   374,790,000
Allowance for Loan and Lease Losses, Real Estate     889,000
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, Related Allowance $ 0   0
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan 0 0  
Real Estate Acquired Through Foreclosure $ 608,000    
Number Of Properties Acquired Through Foreclosure | property 1    
Financing Receivable, Troubled Debt Restructuring $ 102,000   $ 1,100,000
Proceeds from Sale of Foreclosed Assets 451,000    
Delaware Bancshares, Inc. Acquisition [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance 1,397,000    
Assets, Fair Value Adjustment 499,000    
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Annual Loan Review threshold, amount $ 1,500,000