Governmental Issuer Loans - Additional Information (Details) $ in Millions	Dec. 31, 2022 USD ($) Entities Property	Dec. 31, 2021 USD ($) Property
Governmental Issuer Loans [Line Items]
Number of Variable Interest Entities | Property	35	30
Governmental Issuer Loans [Member]
Governmental Issuer Loans [Line Items]
Outstanding principal	$ 223.4
Number of Variable Interest Entities | Entities	2
Governmental Issuer Loans [Member] | Legacy Commons at Signal Hills [Member]
Governmental Issuer Loans [Line Items]
Loans commitment		$ 34.6
Governmental Issuer Loans [Member] | Hilltop at Signal Hills [Member]
Governmental Issuer Loans [Line Items]
Loans commitment		24.5
Governmental Issuer Loans [Member] | Hope on Avalon - taxable GIL [Member]
Governmental Issuer Loans [Line Items]
Loans commitment		23.4
Governmental Issuer Loans [Member] | Hope on Broadway [Member]
Governmental Issuer Loans [Line Items]
Loans commitment		12.1
Governmental Issuer Loans [Member] | Osprey Village [Member]
Governmental Issuer Loans [Line Items]
Loans commitment		60.0
Governmental Issuer Loans [Member] | Willow Place Apartments [Member]
Governmental Issuer Loans [Line Items]
Loans commitment		$ 25.0
Governmental Issuer Loans [Member] | Magnolia Heights [Member]
Governmental Issuer Loans [Line Items]
Loans commitment	$ 20.4
Governmental Issuer Loans [Member] | Poppy Grove I [Member]
Governmental Issuer Loans [Line Items]
Loans commitment	35.7
Governmental Issuer Loans [Member] | Poppy Grove I I [Member]
Governmental Issuer Loans [Line Items]
Loans commitment	22.3
Governmental Issuer Loans [Member] | Poppy Grove I I I [Member]
Governmental Issuer Loans [Line Items]
Loans commitment	39.1
Property Loans [Member]
Governmental Issuer Loans [Line Items]
Outstanding principal	$ 123.8