Notes and Bonds Payable - Details of Mortgage Notes (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) mortage_note_payable	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Number of outstanding mortgage notes | mortage_note_payable	2
Mortgage Notes
Debt Instrument [Line Items]
Investment in collateral	$ 139,800,000
Mortgage notes payable carrying amount	$ 45,100,000	$ 70,500,000
Number of outstanding mortgage notes | mortage_note_payable	4
Mortgage Notes | Minimum
Debt Instrument [Line Items]
Contractual interest rates	3.60%
Mortgage Notes | Maximum
Debt Instrument [Line Items]
Contractual interest rates	4.50%
Mortgage Notes | Mortgage Notes 4.13% | Life Insurance Co.
Debt Instrument [Line Items]
Senior notes principal balance	$ 13,300,000
Effective interest rate	4.13%
Collateral	MOB
Principal and interest amortization period	10 years
Investment in collateral	$ 0
Mortgage notes payable carrying amount	0	11,300,000
Unamortized premium	800,000
Mortgage Notes | Mortgage Notes 3.96% | Life Insurance Co.
Debt Instrument [Line Items]
Senior notes principal balance	$ 6,800,000
Effective interest rate	3.96%
Collateral	MOB
Principal and interest amortization period	7 years
Investment in collateral	$ 0
Mortgage notes payable carrying amount	0	5,600,000
Unamortized premium	200,000
Mortgage Notes | Mortgage Notes 4.32% | Life Insurance Co.
Debt Instrument [Line Items]
Mortgage notes payable carrying amount		7,200,000
Mortgage Notes | Mortgage Notes 4.32% | Financial Services
Debt Instrument [Line Items]
Senior notes principal balance	$ 9,700,000
Effective interest rate	4.32%
Collateral	MOB
Principal and interest amortization period	10 years
Investment in collateral	$ 0
Mortgage notes payable carrying amount	0
Unamortized premium	100,000
Mortgage Notes | Mortgage Notes 3.43% | Life Insurance Co.
Debt Instrument [Line Items]
Senior notes principal balance	$ 16,500,000
Effective interest rate	3.57%
Collateral	MOB,OFC
Principal and interest amortization period	7 years
Investment in collateral	$ 39,700,000
Mortgage notes payable carrying amount	15,400,000	15,900,000
Unamortized premium	700,000
Mortgage Notes | Mortgage Notes 3.71% | Financial Services
Debt Instrument [Line Items]
Senior notes principal balance	$ 11,500,000
Effective interest rate	3.71%
Collateral	MOB
Principal and interest amortization period	10 years
Investment in collateral	$ 42,300,000
Mortgage notes payable carrying amount	7,400,000	7,800,000
Mortgage Notes | Mortgage Notes 6.883% | Life Insurance Co.
Debt Instrument [Line Items]
Senior notes 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]
Collateral	MOB
Investment in collateral	$ 11,800,000
Mortgage notes payable carrying amount	5,200,000	5,200,000
Mortgage Notes | Mortgage Notes 4.08% | Life Insurance Co.
Debt Instrument [Line Items]
Senior notes principal balance	$ 19,200,000
Effective interest rate	4.08%
Collateral	MOB
Principal and interest amortization period	10 years
Investment in collateral	$ 46,000,000.0
Mortgage notes payable carrying amount	$ 17,100,000	$ 17,500,000