Governmental Issuer Loans - Summary of Partnership's Investments and Remaining Funding Commitments Related to Governmental Issuer Loans (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2020
Governmental Issuer Loans [Line Items]
Construction financing, extended maturity month and year	2023-07
Construction financing, extended maturity month and year upon payment of non-refundable extension fee	2024-01
SIFMA [Member]
Governmental Issuer Loans [Line Items]
Variable rate	2.25%
SIFMA [Member] | Floor Rate [Member]
Governmental Issuer Loans [Line Items]
Variable rate	0.50%