Notes and Bonds Payable - Details of Mortgage Notes (Details)	12 Months Ended
Dec. 31, 2021 USD ($) mortageNotePayable	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Number of outstanding mortgage notes \| mortageNotePayable	8
Mortgage Notes
Debt Instrument [Line Items]
Investment in Collateral	$ 281,200,000
Mortgage notes payable carrying amount	$ 104,700,000	$ 117,800,000
Number of outstanding mortgage notes \| mortageNotePayable	10
Mortgage Notes \| Minimum
Debt Instrument [Line Items]
Contractual interest rates	3.30%
Mortgage Notes \| Maximum
Debt Instrument [Line Items]
Contractual interest rates	6.20%
Mortgage Notes \| Mortgage Notes3.87% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 11,000,000.0
Effective Interest rate	3.87%
Debt instrument maturity period	2022-11
Collateral	MOB
Principal and Interest Payments	Monthly/7-yr amort.
Investment in Collateral	$ 0
Mortgage notes payable carrying amount	0	9,800,000
Unencumbered gross investment	$ 22,000,000
Principal and interest amortization period	7 years
Mortgage Notes \| Mortgage Notes 4.27% \| Financial Services
Debt Instrument [Line Items]
Mortgage notes	$ 12,400,000
Effective Interest rate	4.27%
Collateral	MOB
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 0
Mortgage notes payable carrying amount	0	11,400,000
Unencumbered gross investment	$ 23,200,000
Mortgage Notes \| Mortgage Notes 4.27% \| Commercial Bank
Debt Instrument [Line Items]
Debt instrument maturity period	2021-02
Principal and interest amortization period	12 years
Mortgage Notes \| Mortgage Notes 3.86% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 12,300,000
Effective Interest rate	3.86%
Debt instrument maturity period	2020-08
Collateral	MOB
Principal and Interest Payments	Monthly/7-yr amort.
Investment in Collateral	$ 25,900,000
Mortgage notes payable carrying amount	10,300,000	10,600,000
Unaccreted discount	$ 200,000
Principal and interest amortization period	27 years
Mortgage Notes \| Mortgage Notes 4.84% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 9,000,000.0
Effective Interest rate	4.84%
Debt instrument maturity period	2021-01
Collateral	MOB,OFC
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 28,100,000
Mortgage notes payable carrying amount	7,100,000	7,300,000
Unamortized premium	$ 100,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 4.13% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 13,300,000
Effective Interest rate	4.13%
Debt instrument maturity period	2024-01
Collateral	MOB
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 21,600,000
Mortgage notes payable carrying amount	12,000,000.0	12,400,000
Unamortized premium	$ 800,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 3.96% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 6,800,000
Effective Interest rate	3.96%
Debt instrument maturity period	2024-02
Collateral	MOB
Principal and Interest Payments	Monthly/7-yr amort.
Investment in Collateral	$ 14,700,000
Mortgage notes payable carrying amount	6,000,000.0	6,200,000
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		8,100,000
Mortgage Notes \| Mortgage Notes 4.32% \| Financial Services
Debt Instrument [Line Items]
Mortgage notes	$ 9,700,000
Effective Interest rate	4.32%
Debt instrument maturity period	2024-09
Collateral	MOB
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 16,500,000
Mortgage notes payable carrying amount	7,800,000
Unamortized premium	$ 100,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 3.43% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 16,500,000
Effective Interest rate	3.43%
Debt instrument maturity period	2025-01
Collateral	MOB,OFC
Principal and Interest Payments	Monthly/7-yr amort.
Investment in Collateral	$ 38,700,000
Mortgage notes payable carrying amount	16,700,000	17,100,000
Unamortized premium	$ 700,000
Principal and interest amortization period	7 years
Mortgage Notes \| Mortgage Notes 3.71% \| Financial Services
Debt Instrument [Line Items]
Mortgage notes	$ 11,500,000
Effective Interest rate	3.71%
Debt instrument maturity period	2026-01
Collateral	MOB
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 39,800,000
Mortgage notes payable carrying amount	$ 8,700,000	9,200,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 4.08% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 19,200,000
Effective Interest rate	4.08%
Debt instrument maturity period	2026-12
Collateral	MOB
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 44,100,000
Mortgage notes payable carrying amount	$ 18,400,000	18,700,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 5.25% \| Commercial Bank
Debt Instrument [Line Items]
Mortgage notes	$ 15,000,000.0
Effective Interest rate	5.25%
Debt instrument maturity period	2027-04
Collateral	MOB
Principal and Interest Payments	Monthly/20-yr amort.
Investment in Collateral	$ 31,500,000
Mortgage notes payable carrying amount	6,100,000	7,000,000.0
Unamortized premium	$ 700,000
Principal and interest amortization period	20 years
Mortgage Notes \| Mortgage Notes 3.64% \| Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes	$ 11,000,000.0
Effective Interest rate	3.64%
Debt instrument maturity period	2027-05
Collateral	MOB
Principal and Interest Payments	Monthly/10-yr amort.
Investment in Collateral	$ 20,300,000
Mortgage notes payable carrying amount	11,600,000	$ 0
Unamortized premium	$ 800,000
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes Seven Point Six Five Zero Percent [Member] \| Commercial Bank
Debt Instrument [Line Items]
Debt instrument maturity period	2020-07
Mortgage Notes \| Mortgage Notes 4.84% \| Life Insurance Co.
Debt Instrument [Line Items]
Debt instrument maturity period	2023-12
Principal and interest amortization period	10 years
Mortgage Notes \| Mortgage Notes 4.00% \| Commercial Bank
Debt Instrument [Line Items]
Debt instrument maturity period	2020-08
Principal and interest amortization period	15 years
Mortgage Notes \| Mortgage Notes 4.27% \| Financial Services
Debt Instrument [Line Items]
Debt instrument maturity period	2023-10
Principal and interest amortization period	10 years

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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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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