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Loans Receivable and Allowance for Credit Losses (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
property
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Financing Receivable, Modifications, Post-Modification Recorded Investment         $ 755,000      
Real Estate Acquired Through Foreclosure $ 0   $ 0   97,000      
Financing Receivable, before Allowance for Credit Loss 1,641,531,000   1,641,531,000   1,603,877,000      
Charge offs 530,000 $ 251,000 1,024,000 $ 615,000        
Allowance for loan losses 17,806,000 17,483,000 17,806,000 17,483,000 18,968,000 $ 18,020,000 $ 19,445,000 $ 16,999,000
(Release of) Provision for credit losses 297,000 (1,734,000) (328,000) (1,434,000)        
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          
Residential Real Estate Loans [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number Of Properties Under Foreclosure Proceedings | property     8          
Mortgage Loans in Process of Foreclosure, Amount 364,000   $ 364,000          
Financing Receivable, before Allowance for Credit Loss 317,507,000   317,507,000   316,546,000      
Charge offs   6,000   6,000        
Allowance for loan losses 1,131,000 1,264,000 1,131,000 1,264,000 1,351,000 1,197,000 1,359,000 2,833,000
(Release of) Provision for credit losses (66,000) (89,000) (262,000) (24,000)        
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 112,764,000   $ 112,764,000          
Concentration Risk, Percentage     6.87%          
Commercial Real Estate Loans [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Financing Receivable, Modifications, Post-Modification Recorded Investment         533,000      
Financing Receivable, before Allowance for Credit Loss 685,212,000   $ 685,212,000   675,156,000      
Charge offs   42,000   154,000        
Allowance for loan losses 9,552,000 11,253,000 9,552,000 11,253,000 $ 11,871,000 $ 9,831,000 $ 13,725,000 8,293,000
(Release of) Provision for credit losses (281,000) $ (2,433,000) (2,423,000) $ (2,422,000)        
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 $ 146,099,000   $ 146,099,000          
Concentration Risk, Percentage     8.90%          
Minimum [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Annual Loan Review threshold, amount     $ 1,500,000          
Adoption Impact [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan losses               2,466,000
Adoption Impact [Member] | Residential Real Estate Loans [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan losses               (1,545,000)
Adoption Impact [Member] | Commercial Real Estate Loans [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan losses               $ 5,527,000