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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

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