Subsequent Events - Additional Information (Details) - Subsequent Event [Member]	1 Months Ended
	Jul. 31, 2020 USD ($)
Subsequent Event [Line Items]
Governmental issuer loan advance amount	$ 11,600,000
Property loan advance amount	0
MRB commitment advance amount	300,000
Funds advanced for taxable MRB	$ 0
TOB Trust [Member] | Mizuho Capital Markets [Member]
Subsequent Event [Line Items]
Extended maturity period, Beginning	2021
Extended maturity period, end	2023-07
Unsecured Lines of Credit [Member]
Subsequent Event [Line Items]
Commitment Maturity	2022-06