Subsequent Events - Summary of Terms of MRB and Taxable MRB Commitments (Parenthetical) (Details) - Subsequent Event [Member] - Mortgage Revenue Bonds [Member] - The Residency at the Mayer [Member] - CA [Member] $ in Millions	Oct. 31, 2021 USD ($)
Mortgage Loans on Real Estate [Line Items]
Floor rate	0.25%
Series A-T [Member]
Mortgage Loans on Real Estate [Line Items]
Maximum balance of mortgage revenue bonds after stabilization	$ 18.1
Series A [Member]
Mortgage Loans on Real Estate [Line Items]
Fixed interest rate	4.90%