Loans - Secured Loans by Property Type (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
Loans - percent			100.00%	100.00%
Single Family [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan	[1]		25	47
Principal | $	[1]		$ 24,236,000	$ 30,298,000
Loans - percent	[1]		30.00%	37.00%
Commercial [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan			19	27
Principal | $			$ 41,923,000	$ 43,692,000
Loans - percent			52.00%	53.00%
Multifamily [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan			9	8
Principal | $			$ 13,438,000	$ 8,285,000
Loans - percent			16.00%	10.00%
Land [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Number of secured loans | MortgageLoan			1	0
Principal | $			$ 1,500,000	$ 0
Loans - percent			2.00%	0.00%

[1] Single family property type as of December 31, 2021 consists of 7 loans with principal of $4,619,000 that are owner occupied and 18 loans with principal of $19,617,000 that are non-owner occupied. At December 31, 2020, single family property consisted of 8 loans with principal of approximately $5,565,000 that are owner occupied and 39 loans with principal of approximately $24,733,000 that are non-owner occupied.