Loans - Secured Loans by Property Type (Parenthetical) (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) MortgageLoan	Dec. 31, 2021 USD ($) MortgageLoan	Dec. 31, 2020 USD ($) MortgageLoan	Dec. 31, 2019 USD ($)
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan	1	54	82
Principal | $	$ 586,000	$ 81,097,000	$ 82,275,000	$ 70,660,000
Single Family Property-Owner Occupied [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan		7	8
Principal | $		$ 4,619,000	$ 5,565,000
Single Family Property-NonOwner Occupied [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan		18	39
Principal | $		$ 19,617,000	$ 24,733,000