Segments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 Security Segment Property Unit
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	76
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	1
Number of rental units under MF properties segment	384
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	10,822
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] | Affordable Multifamily Mortgage Revenue Bond Investments Segment [Member]
Segment Reporting Information [Line Items]
Number of collateralized securities | Security	1