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Loans Receivable and Allowance for Credit Losses (Narrative) (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) item property | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate Acquired Through Foreclosure | $ 97,000 |  | $ 97,000 |
Financing Receivable, before Allowance for Credit Loss | $ 1,621,680,000 |  | 1,603,877,000 |
Number of loan modifications to borrowers experiencing financial difficulty | item | 3 |  |  |
Charge offs | $ 494,000 | $ 364,000 |  |
Allowance for loan losses | 18,020,000 | 19,445,000 | 18,968,000 |
(Release of) Provision for credit losses | (625,000) | 300,000 |  |
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 | 6 |  |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 285,000 |  |  |
Financing Receivable, before Allowance for Credit Loss | 313,531,000 |  | 316,546,000 |
Allowance for loan losses | 1,197,000 | 1,359,000 | 1,351,000 |
(Release of) Provision for credit losses | (196,000) | 65,000 |  |
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 | $ 113,474,000 |  |  |
Concentration Risk, Percentage | 7.00% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 691,755,000 |  | 675,156,000 |
Charge offs |  | 112,000 |  |
Allowance for loan losses | 9,831,000 | 13,725,000 | $ 11,871,000 |
(Release of) Provision for credit losses | (2,142,000) | $ 11,000 |  |
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 | $ 148,899,000 |  |  |
Concentration Risk, Percentage | 9.18% |  |  |
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

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