Loans - Secured Loans Designated as Impaired Loans (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan
Secured Loans Designated as Impaired Loans [Abstract]
Number of loans | Loan		4	3
Principal	[1]	$ 1,044	$ 15,139
Recorded investment	[2]	1,173	15,531
Impaired loans without allowance		1,173	15,531
Impaired loans with allowance		0	0
Allowance for loan losses, impaired loans		$ 0	$ 0
Weighted average LTV, at origination		45.40%	54.00%

[1] In February 2022, three loans, with aggregate principal of approximately $987,000, included in the table above for 2021 paid in full or were brought current.

[2] Recorded investment is the sum of principal, advances, and interest accrued for financial reporting purposes.