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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