Loans Portfolio - Schedule of Interests in Loans Receivable Portfolio (Details) - Held-to-maturity Securities - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Balance	$ 338,270	$ 222,891
Advances on existing interests in loans receivable	86,022	83,963
Non-cash advances to interests in loans receivable in lieu of interest	15,149	9,458
Extension fees received on interests in loans receivable		(453)
Repayments of interests in loans receivable	(2,977)	(15,224)
Repayment of non-cash advances to interests in loans receivable in lieu of interest	(363)
Accretion of origination fees, net	849	227
Allowance for loan losses	(229)
Balance	$ 436,721	$ 300,862