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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
loan
property
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Payments for Origination of Mortgage Loans Held-for-sale $ 8,616,000 $ 12,312,000  
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment 0    
Financing Receivable, Troubled Debt Restructuring 0 0  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 0 20,000  
Loans acquired with credit deterioration 15,410,000    
Real Estate Acquired Through Foreclosure 1,742,000 965,000  
Annual Loan Review threshold, amount 1,500,000    
Loans and Leases Receivable, Gross 1,356,040,000 1,412,289,000  
Proceeds from Sale of Mortgage Loans Held-for-sale 8,616,000 12,312,000  
Allowance for Loan and Lease Losses, Adjustments, Other 1,500,000 2,300,000  
Allowance for Loan and Lease Losses, Period Increase (Decrease) 3,292,000 4,641,000  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 35,000 286,000  
Allowance for Loan and Lease Losses, Real Estate 16,442,000 13,150,000 $ 8,509,000
Servicing Asset at Amortized Cost 65,400,000 72,500,000  
Outstanding Balance 12,862,000 15,570,000  
Hospitality Lodging Industry [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 0 0  
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number Of Properties Under Foreclosure Proceedings | loan 5    
Mortgage Loans in Process of Foreclosure, Amount $ 532,000    
Loans and Leases Receivable, Gross 273,040,000 263,127,000  
Proceeds from Sale of Mortgage Loans Held-for-sale 8,793,000 12,839,000  
Gross Realized Gains on Loans 177,000 527,000  
Gross Realized Losses on Loans 0 0  
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 $ 116,300,000    
Concentration Risk, Percentage 8.60%    
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number Of Properties Under Foreclosure Proceedings | property 2    
Loans and Leases Receivable, Gross $ 628,724,000 579,104,000  
Commercial Real Estate Loans [Member] | Commercial Rentals [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 135,700,000    
Concentration Risk, Percentage 10.00%    
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Modifications, Post-Modification Recorded Investment   75,000  
PPP Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 15,209,000 95,043,000  
Fee income 2,900,000 2,300,000  
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) $ 1,400,000 $ 2,200,000