Loans - Secured Loans Distributed Within California (Details) - USD ($)		Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal		$ 586,000	$ 81,097,000	$ 82,275,000	$ 70,660,000
Loans - percent			100.00%	100.00%
Santa Clara [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 26,064,000	$ 23,206,000
Loans - percent	[1]		32.10%	28.20%
San Francisco [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 22,919,000	$ 11,340,000
Loans - percent	[1]		28.30%	13.80%
San Mateo [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 4,985,000	$ 6,878,000
Loans - percent	[1]		6.10%	8.40%
Alameda [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 5,637,000	$ 6,791,000
Loans - percent	[1]		7.00%	8.20%
Contra Costa [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 668,000	$ 1,094,000
Loans - percent	[1]		0.80%	1.30%
Marin [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 0	$ 1,945,000
Loans - percent	[1]		0.00%	2.40%
San Francisco Bay Area [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal	[1]		$ 60,273,000	$ 51,254,000
Loans - percent	[1]		74.30%	62.30%
Placer [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 1,500,000	$ 0
Loans - percent			1.80%	0.00%
Monterey [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 0	$ 1,110,000
Loans - percent			0.00%	1.40%
Tehama [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 405,000	$ 405,000
Loans - percent			0.50%	0.50%
Butte [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 292,000	$ 0
Loans - percent			0.40%	0.00%
Sacramento [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 0	$ 104,000
Loans - percent			0.00%	0.10%
Other Northern California [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 2,197,000	$ 1,619,000
Loans - percent			2.70%	2.00%
Northern California [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 62,470,000	$ 52,873,000
Loans - percent			77.00%	64.30%
Los Angeles [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 3,621,000	$ 11,775,000
Loans - percent			4.50%	14.30%
San Diego [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 6,043,000	$ 10,186,000
Loans - percent			7.50%	12.40%
Orange [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 8,444,000	$ 5,432,000
Loans - percent			10.40%	6.60%
Santa Barbara [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 0	$ 290,000
Loans - percent			0.00%	0.30%
Los Angeles & Coastal [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 18,108,000	$ 27,683,000
Loans - percent			22.40%	33.60%
San Bernardino [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 519,000	$ 1,719,000
Loans - percent			0.60%	2.10%
Other Southern California [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 519,000	$ 1,719,000
Loans - percent			0.60%	2.10%
Southern California [Member]
Loans (Details) - Secured Loans Distributed Within California [Line Items]
Principal			$ 18,627,000	$ 29,402,000
Loans - percent			23.00%	35.70%

[1] Includes Silicon Valley