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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
property
loan
Jun. 30, 2021
loan
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans acquired with credit deterioration $ 15,410,000    
Real Estate Acquired Through Foreclosure 346,000   $ 1,742,000
Impaired Financing Receivable, Related Allowance     272,000
Loans and Leases Receivable, Gross 1,405,017,000   1,356,040,000
Outstanding Balance 9,701,000   12,862,000
Single Property [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real Estate Disposal Through Foreclosure $ 364,000    
Multiple Properties [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number Of Properties Acquired Through Foreclosure | property 0    
Number Of Properties Disposed By Sale | property 1    
Real Estate Disposal Through Foreclosure $ 1,032,000    
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 $ 180,000    
Loans and Leases Receivable, Gross 289,157,000   273,040,000
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 $ 115,500,000    
Concentration Risk, Percentage 8.20%    
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, Related Allowance     272,000
Loans and Leases Receivable, Gross $ 645,404,000   628,724,000
Commercial Real Estate Loans [Member] | Commercial Rentals [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 145,000,000.0    
Concentration Risk, Percentage 10.30%    
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan 0 0  
PPP Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding Balance $ 983,000,000,000   15,200,000
Loan forgiven 150,500,000    
Fee income 5,100,000    
Unamortized loan fees 30,000    
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    
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) $ 1,200,000   $ 2,300,000