Commitments and Contingencies - Additional Information (Details) $ in Millions	Dec. 31, 2020 USD ($)
Greens of Pine Glen [Member]
Commitments And Other Guarantees [Line Items]
Percentage of loss contingency, range of possible loss, maximum	75.00%
Series A MRB [Member]
Commitments And Other Guarantees [Line Items]
Remaining maximum commitments amount	$ 13.0
Series A-T taxable MRB [Member]
Commitments And Other Guarantees [Line Items]
Remaining maximum commitments amount	$ 7.0