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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment $ 0    
Loans acquired with credit deterioration 15,410,000    
Real Estate Acquired Through Foreclosure 965,000 $ 1,556,000  
Impaired Financing Receivable, Related Allowance   417,000  
Annual Loan Review threshold, amount 1,500,000    
Loans and Leases Receivable, Gross 1,412,289,000 924,676,000  
Allowance for Loan and Lease Losses, Adjustments, Other 2,300,000 417,000  
Allowance for Loan and Lease Losses, Period Increase (Decrease) 4,641,000 57,000  
Allowance for Loan and Lease Losses, Adjustment Related To Economic Conditions   447,000  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 727,000 101,000  
Allowance for Loan and Lease Losses, Real Estate 13,150,000 $ 8,509,000 $ 8,452,000
Historical loss factor   0.15% 0.26%
Servicing Asset at Amortized Cost 72,500,000 $ 28,500,000  
Outstanding Balance 15,570,000 793,000  
Mortgage loans originated for sale 12,312,000 4,715,000  
Commercial Rentals [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 125,300,000    
Concentration Risk, Percentage 86.40%    
Hospitality Lodging Industry [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 117,800,000    
Concentration Risk, Percentage 81.20%    
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number Of Properties Under Foreclosure Proceedings | loan 4    
Mortgage Loans in Process of Foreclosure, Amount $ 454,000    
Loans and Leases Receivable, Gross 263,127,000 229,781,000  
Proceeds from Sale of Mortgage Loans Held-for-sale 12,839,000 4,838,000  
Gross Realized Gains on Loans 527,000 169,000  
Gross Realized Losses on Loans 0 0  
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, Related Allowance   417,000  
Loans and Leases Receivable, Gross 579,104,000 391,327,000  
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Modifications, Post-Modification Recorded Investment 75,000 99,000 $ 977,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 20,000 $ 977,000  
PPP Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 95,043,000    
Fee income 2,500,000    
UpState New York Bancorp, Inc. [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Assets, Fair Value Adjustment 6,937,000    
Outstanding Balance 15,410,000    
COVID [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ 2,200,000