Investments of Consolidated Affordable Housing Fund (Details) - Primary beneficiary $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) affordableHousingCommunity affordableHousingUnit	Dec. 31, 2018 affordableHousingCommunity	Dec. 31, 2017 affordableHousingCommunity	Dec. 31, 2016 affordableHousingCommunity	Dec. 31, 2015 affordableHousingCommunity	Dec. 31, 2021 USD ($)
Investments in and Advances to Affiliates [Line Items]
Investments of consolidated affordable housing fund, at fair value	$ 1,264,160					$ 1,040,309
Woodstar I Portfolio
Investments in and Advances to Affiliates [Line Items]
Number of affordable housing communities in portfolio | affordableHousingCommunity	32
Number of affordable housing units in portfolio | affordableHousingUnit	8,948
Number of affordable housing communities acquired in portfolio | affordableHousingCommunity				14	18
Investments of consolidated affordable housing fund, at fair value	$ 1,300,000
Debt fair value	$ 735,600
Woodstar II Portfolio
Investments in and Advances to Affiliates [Line Items]
Number of affordable housing communities in portfolio | affordableHousingCommunity	27
Number of affordable housing units in portfolio | affordableHousingUnit	6,109
Number of affordable housing communities acquired in portfolio | affordableHousingCommunity		19	8
Investments of consolidated affordable housing fund, at fair value	$ 1,200,000
Debt fair value	$ 500,400