Notes and Bonds Payable - Details of Mortgage Notes (Details)	12 Months Ended
Dec. 31, 2022 USD ($) mortage_note_payable	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Number of outstanding mortgage notes \| mortage_note_payable	6
Mortgage Notes
Debt Instrument [Line Items]
Investment in collateral	$ 228,300,000
Mortgage notes payable carrying amount	$ 84,200,000	$ 104,700,000
Number of outstanding mortgage notes \| mortage_note_payable	8
Mortgage Notes \| Minimum
Debt Instrument [Line Items]
Contractual interest rates	3.30%
Mortgage Notes \| Maximum
Debt Instrument [Line Items]
Contractual interest rates	4.80%
Mortgage Notes \| Mortgage Notes 5.25% \| Commercial Bank
Debt Instrument [Line Items]
FACE VALUE	$ 15,000,000.0
Effective interest rate	5.25%
Collateral	MOB
Investment in collateral	$ 0
Mortgage notes payable carrying amount	$ 0	6,100,000
Principal and interest amortization period	20 years
Mortgage Notes \| Mortgage Notes 3.64% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 11,000,000.0
Effective interest rate	3.64%
Collateral	MOB
Investment in collateral	$ 0
Mortgage notes payable carrying amount	$ 0	11,600,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 3.64% \| Financial Services
Debt Instrument [Line Items]
Unencumbered gross investment	$ 20,600,000
Mortgage Notes \| Mortgage Notes 3.86% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 12,300,000
Effective interest rate	3.86%
Collateral	MOB
Investment in collateral	$ 25,900,000
Mortgage notes payable carrying amount	10,000,000.0	10,300,000
Unaccreted discount	$ 200,000
Principal and interest amortization period	7 years
Mortgage Notes \| Mortgage Notes 4.84% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 9,000,000.0
Effective interest rate	4.84%
Collateral	MOB,OFC
Investment in collateral	$ 24,500,000
Mortgage notes payable carrying amount	6,800,000	7,100,000
Unamortized premium	100,000
Mortgage Notes \| Mortgage Notes 4.13% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 13,300,000
Effective interest rate	4.13%
Collateral	MOB
Investment in collateral	$ 22,500,000
Mortgage notes payable carrying amount	11,700,000	12,000,000.0
Unamortized premium	$ 800,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 3.96% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 6,800,000
Effective interest rate	3.96%
Collateral	MOB
Investment in collateral	$ 14,700,000
Mortgage notes payable carrying amount	5,800,000	6,000,000.0
Unamortized premium	$ 200,000
Principal and interest amortization period	7 years
Mortgage Notes \| Mortgage Notes 4.32% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes payable carrying amount		7,800,000
Mortgage Notes \| Mortgage Notes 4.32% \| Financial Services
Debt Instrument [Line Items]
FACE VALUE	$ 9,700,000
Effective interest rate	4.32%
Collateral	MOB
Investment in collateral	$ 16,600,000
Mortgage notes payable carrying amount	7,500,000
Unamortized premium	$ 100,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 3.43% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 16,500,000
Effective interest rate	3.43%
Collateral	MOB,OFC
Investment in collateral	$ 39,100,000
Mortgage notes payable carrying amount	16,200,000	16,700,000
Unamortized premium	$ 700,000
Principal and interest amortization period	7 years
Mortgage Notes \| Mortgage Notes 3.71% \| Financial Services
Debt Instrument [Line Items]
FACE VALUE	$ 11,500,000
Effective interest rate	3.71%
Collateral	MOB
Investment in collateral	$ 40,500,000
Mortgage notes payable carrying amount	$ 8,300,000	8,700,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 4.08% \| Life Insurance Co.
Debt Instrument [Line Items]
FACE VALUE	$ 19,200,000
Effective interest rate	4.08%
Collateral	MOB
Investment in collateral	$ 44,500,000
Mortgage notes payable carrying amount	$ 17,900,000	$ 18,400,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 4.84% \| Life Insurance Co.
Debt Instrument [Line Items]
Principal and interest amortization period	10 years

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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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