Loans - Secured Loans by Property Type (Parenthetical) (Details)	1 Months Ended	12 Months Ended
	Jun. 30, 2020 MortgageLoan	Dec. 31, 2021 USD ($) MortgageLoan	Dec. 31, 2020 USD ($) MortgageLoan	Dec. 31, 2019 USD ($)
Loans Details [Line Items]
Amount includes principal collected and held in trust.		$ 464,000,000
Number of secured loans | MortgageLoan	2	31	33
Secured loans, principal		$ 55,099,000	$ 74,080,000	$ 86,203,000
Single Family Property-Owner Occupied [Member]
Loans Details [Line Items]
Number of secured loans | MortgageLoan		4	8
Secured loans, principal		$ 2,306,000	$ 3,344,000
Single Family Property-NonOwner Occupied [Member]
Loans Details [Line Items]
Number of secured loans | MortgageLoan		12	11
Secured loans, principal		$ 12,291,000	$ 13,254,000