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Notes and Bonds Payable - Details of Mortgage Notes (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) mortage_note_payable | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |
Number of outstanding mortgage notes | mortage_note_payable | 4 |
Mortgage Notes |  |
Debt Instrument [Line Items] |  |
Investment in collateral | $ 202,100,000 |
Mortgage notes payable carrying amount | $ 70,500,000 | $ 84,200,000
Number of outstanding mortgage notes | mortage_note_payable | 7 |
Mortgage Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Contractual interest rates | 3.60% |
Mortgage Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Contractual interest rates | 4.80% |
Mortgage Notes | Mortgage Notes 3.86% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 12,300,000 |
Effective interest rate | 3.86% |
Collateral | MOB |
Principal and interest amortization period | 7 years |
Investment in collateral | $ 0 |
Mortgage notes payable carrying amount | 0 | 10,000,000.0
Unencumbered gross investment | 26,000,000 |
Mortgage Notes | Mortgage Notes 4.84% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 9,000,000.0 |
Effective interest rate | 4.84% |
Collateral | MOB,OFC |
Principal and interest amortization period | 10 years |
Investment in collateral | $ 0 |
Mortgage notes payable carrying amount | 0 | 6,800,000
Unencumbered gross investment | 24,500,000 |
Mortgage Notes | Mortgage Notes 4.13% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 13,300,000 |
Effective interest rate | 4.13% |
Collateral | MOB |
Principal and interest amortization period | 10 years |
Investment in collateral | $ 24,400,000 |
Mortgage notes payable carrying amount | 11,300,000 | 11,700,000
Unamortized premium | 800,000 |
Mortgage Notes | Mortgage Notes 3.96% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 6,800,000 |
Effective interest rate | 3.96% |
Collateral | MOB |
Principal and interest amortization period | 7 years |
Investment in collateral | $ 12,600,000 |
Mortgage notes payable carrying amount | 5,600,000 | 5,800,000
Unamortized premium | 200,000 |
Mortgage Notes | Mortgage Notes 4.32% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable carrying amount |  | 7,500,000
Mortgage Notes | Mortgage Notes 4.32% | Financial Services |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 9,700,000 |
Effective interest rate | 4.32% |
Collateral | MOB |
Principal and interest amortization period | 10 years |
Investment in collateral | $ 16,900,000 |
Mortgage notes payable carrying amount | 7,200,000 |
Unamortized premium | 100,000 |
Mortgage Notes | Mortgage Notes 3.43% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 16,500,000 |
Effective interest rate | 3.43% |
Collateral | MOB,OFC |
Principal and interest amortization period | 7 years |
Investment in collateral | $ 49,200,000 |
Mortgage notes payable carrying amount | 15,900,000 | 16,200,000
Unamortized premium | 700,000 |
Mortgage Notes | Mortgage Notes 3.71% | Financial Services |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 11,500,000 |
Effective interest rate | 3.71% |
Collateral | MOB |
Principal and interest amortization period | 10 years |
Investment in collateral | $ 41,700,000 |
Mortgage notes payable carrying amount | 7,800,000 | 8,300,000
Mortgage Notes | Mortgage Notes 6.883% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 6,000,000.0 |
Effective interest rate | 6.88% |
Principal and interest amortization period | 7 years |
Unaccreted discount | $ 300,000 |
Mortgage Notes | Mortgage Notes 6.883% | Financial Services |  |
Debt Instrument [Line Items] |  |
Investment in collateral | 11,600,000 |
Mortgage notes payable carrying amount | 5,200,000 | 0
Mortgage Notes | Mortgage Notes 4.08% | Life Insurance Co. |  |
Debt Instrument [Line Items] |  |
Principal balance | $ 19,200,000 |
Effective interest rate | 4.08% |
Collateral | MOB |
Principal and interest amortization period | 10 years |
Investment in collateral | $ 45,700,000 |
Mortgage notes payable carrying amount | $ 17,500,000 | $ 17,900,000

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