Segments - Additional Information (Details)	9 Months Ended
	Sep. 30, 2022 Security Unit Property Segment
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	4
Affordable Multifamily Mortgage Revenue Bond Investments Segment [Member]
Segment Reporting Information [Line Items]
Number of Available for Sale Securities | Security	73
Number of available for sale securities in tax-exempt loan | Security	13
MF Properties Segment [Member]
Segment Reporting Information [Line Items]
Number of Real Estate Properties | Property	2
Number of rental units under MF properties segment	859
Residential Properties [Member] | Affordable Multifamily Mortgage Revenue Bond Investments Segment [Member]
Segment Reporting Information [Line Items]
Number of rental units financed by mortgage revenue bonds	10,337
Number of rental units financed by tax-exempt loan	2,419
Residential Properties [Member] | Seniors and Skilled Nursing Mortgage Revenue Bond Investments Segment [Member]
Segment Reporting Information [Line Items]
Number of rental units financed by mortgage revenue bonds	154
Commercial Real Estate [Member] | Mortgage Revenue Bond Investments Segment [Member]
Segment Reporting Information [Line Items]
Number of collateralized securities | Security	1