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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
loan
property
Dec. 31, 2020
USD ($)
Jul. 07, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans acquired with credit deterioration $ 15,410,000    
Real Estate Acquired Through Foreclosure 844,000 $ 965,000  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down   20,000  
Loans and Leases Receivable, Gross 1,389,620,000 1,412,289,000  
Outstanding Balance 13,526,000 15,570,000  
Multiple Properties [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real Estate Acquired Through Foreclosure $ 121,000    
Number Of Properties Disposed By Sale | property 1    
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number Of Properties Under Foreclosure Proceedings | property 4    
Mortgage Loans in Process of Foreclosure, Amount $ 489,000    
Loans and Leases Receivable, Gross 258,130,000 263,127,000  
Residential Real Estate Loans [Member] | Hospitality Lodging Industry [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 118,400,000    
Concentration Risk, Percentage 8.50%    
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 597,906,000 579,104,000  
Commercial Real Estate Loans [Member] | Commercial Rentals [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 136,600,000    
Concentration Risk, Percentage 9.80%    
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Troubled Debt Restructuring $ 0 75,000  
Impaired Financing Receivable, Related Allowance $ 0 0  
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan 0    
PPP Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding Balance $ 74,200,000 $ 95,000,000.0  
Loan forgiven 77,600,000    
Fee income 4,300,000    
UpState New York Bancorp, Inc. [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Assets, Fair Value Adjustment 6,937,000    
Loans acquired with credit deterioration     $ 15,410,000
Outstanding Balance 15,410,000    
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Annual Loan Review threshold, amount 1,500,000    
COVID [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ 2,300,000