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Loans Receivable and Allowance for Credit Losses (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
item
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
item
loan
property
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Foreclosed real estate owned $ 771,000   $ 771,000   $ 0
Provision for credit losses $ (392,000) $ 1,216,000 $ 1,372,000 $ 888,000  
Number of additions to foreclosed real estate category | item 2   2    
Financing Receivable, before Allowance for Credit Loss $ 1,815,138,000   $ 1,815,138,000   1,714,082,000
Number of loan modifications to borrowers experiencing financial difficulty | loan     8    
Number of loans modified with subsequent default | loan     0    
Charge offs 649,000 358,000 $ 1,529,000 1,382,000  
Residential Rentals [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge offs     0    
Commercial Rentals [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge offs     0    
Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses 691,000 524,000 2,483,000 2,042,000  
Financing Receivable, before Allowance for Credit Loss 346,897,000   346,897,000   307,775,000
Charge offs 490,000 358,000 1,273,000 1,297,000  
Residential Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses 166,000 (82,000) 31,000 (344,000)  
Outstanding balance 259,000   $ 259,000    
Number of properties under foreclosure proceedings | property     5    
Financing Receivable, before Allowance for Credit Loss 339,997,000   $ 339,997,000   330,856,000
Charge offs 63,000   63,000    
Residential Real Estate Loans [Member] | Residential Rentals [Member] | Loans Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 116,554,000   $ 116,554,000    
Concentration Risk, Percentage     6.45%    
Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses (1,634,000) $ 912,000 $ (1,952,000) $ (1,511,000)  
Financing Receivable, before Allowance for Credit Loss 737,533,000   737,533,000   $ 716,875,000
Charge offs 13,000   62,000    
Commercial Real Estate Loans [Member] | Commercial Rentals [Member] | Loans Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss $ 169,560,000   $ 169,560,000    
Concentration Risk, Percentage     9.38%    
All Other Portfolios [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses     $ 841,000    
Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Annual Loan Review threshold, amount     $ 1,500,000