Loans - Secured Loan Principal Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Principal, beginning of period		$ 82,275	$ 70,660
Loans funded		49,182	51,847
Principal collected	[1]	(49,008)	(36,370)
Loans transferred from related mortgage fund		4,672	2,997
Loans transferred to related mortgage funds		(2,560)	(237)
Loans sold to non-affiliate		(3,464)	(6,602)
Charged off		0	(20)
Principal, December 31		$ 81,097	$ 82,275

[1] Includes principal collected and held in trust at December 31, 2021 of approximately $36,000.