Loans - Additional Information (Details)		1 Months Ended	12 Months Ended
		Mar. 31, 2022 USD ($) MortgageLoan Loans	Dec. 31, 2021 USD ($) MortgageLoan Loan		Dec. 31, 2020 USD ($) MortgageLoan Loan		Dec. 31, 2021 MortgageLoan	Dec. 31, 2021	Dec. 31, 2021 Loan	Dec. 31, 2020 MortgageLoan	Dec. 31, 2020 Loan	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loans Details [Line Items]
Mortgage Loans On Real Estate Number Of Loans | MortgageLoan		1	54		82
Mortgage loans on Real estate number Of loans renewed | MortgageLoan			16		20
Aggregated principal renewed			$ 22,678,000		$ 14,144,000
Loans Receivable, Number of Principal and Interest Loans | MortgageLoan							28
Loans Receivable, Amortization Term			30 years
Mortgage Loans On Real Estate Principal Renewed			$ 22,678,000		$ 14,144,000
Number of loans sold | MortgageLoan			7		4
Financing Receivable, Recorded Investment, Nonaccrual Status (in Dollars)			$ 3,464,000		$ 6,122,779							$ 480,000
Accrued Interest On Mortgage Loans Net					28,171
Gain recognized on sales of loans					87,000
Mortgage Loans on Real Estate, Number of Loans | MortgageLoan							3
Largest secured loan - principal (in Dollars)			6,750,000		6,735,000
Commitment to Lend, Outstanding			0
Number of loans							0		54	0	82
Principal			81,097,000		82,275,000
Non-performing loans			$ 2,285,000		$ 1,578,000
Non performing number of loans | Loan			7		8
Forgone interest					$ 42,000
Monthly payments, interest			$ 63,000		$ 21,000
Interest, Due Date			Jan. 01, 2022		Jan. 01, 2021
Accrued interest			$ 529,000		$ 684,000
Allowance for loans losses reserve			$ 0
Number of loans		1	4	[1]	6	[1]
Principal			$ 2,806,000		$ 7,530,000
Total principal, secured loans		$ 586,000	$ 81,097,000		$ 82,275,000								$ 70,660,000
Subsequent Event [Member]
Loans Details [Line Items]
Mortgage Loans On Real Estate Number Of Loans | Loans		2
Single Family [Member]
Loans Details [Line Items]
Mortgage Loans On Real Estate Number Of Loans | MortgageLoan	[2]		25		47
Total principal, secured loans	[2]		$ 24,236,000		$ 30,298,000
San Bernardino [Member]
Loans Details [Line Items]
Total principal, secured loans			519,000		1,719,000
Alameda [Member]
Loans Details [Line Items]
Total principal, secured loans	[3]		5,637,000		6,791,000
San Francisco [Member]
Loans Details [Line Items]
Total principal, secured loans	[3]		22,919,000		11,340,000
Forbearance Agreement [Member]
Loans Details [Line Items]
Number of loans | MortgageLoan										2
Past Due 30-89 Days [Member]
Loans Details [Line Items]
Number of loans | Loan									4		1
Principal			7,165,000		190,000
Past Due 30-89 Days [Member] | Forbearance Agreement [Member]
Loans Details [Line Items]
Number of loans | MortgageLoan							1
Principal			990,000
Past Due 90-179 Days [Member]
Loans Details [Line Items]
Number of loans | Loan									1		5
Principal			930,000		4,757,000
Past Due 90-179 Days [Member] | Forbearance Agreement [Member]
Loans Details [Line Items]
Number of loans | MortgageLoan										1
Principal					990,000
Past Due 180 Or More Days [Member]
Loans Details [Line Items]
Number of loans		1							2		3
Principal		$ 586,000	886,000		3,286,000
Monthly payments, principal			4,000		0
Monthly payments, interest			92,000	[4]	108,000	[5]
Past Due 180 Or More Days [Member] | Subsequent Event [Member]
Loans Details [Line Items]
Mortgage Loans On Real Estate Number Of Loans | Loans		1
Past Due 180 Or More Days [Member] | Forbearance Agreement [Member]
Loans Details [Line Items]
Principal					1,200,000
Past Due 92 Days [Member] | Impaired Loans [Member]
Loans Details [Line Items]
Principal			$ 190,198
Loans receivables maturity date			Jun. 01, 2016
Loans receivable extended maturity date			Oct. 01, 2021
Financial Asset, Equal to or Greater than 90 Days Past Due
Loans Details [Line Items]
Number of loans | MortgageLoan							2			5
Financing receivable, recorded investment, 90 days past due and still accruing			$ 1,230,000		4,703,296,000
Minimum [Member]
Loans Details [Line Items]
Loans Receivable, Remaining Term			5 years
Maximum [Member]
Loans Details [Line Items]
Principal					137,000
Accrued interest			$ 125,000		$ 361,000
Five Years Or Less Term Loans [Member]
Loans Details [Line Items]
Mortgage Loans On Real Estate Number Of Loans | MortgageLoan			51
Loans Receivable, Percent of Aggregate Principal								98.00%
Interest Only [Member]
Loans Details [Line Items]
Loans Receivable, Percent of Aggregate Principal								33.00%
Largest Loan [Member]
Loans Details [Line Items]
Loans Receivable, Yield of Loan Acquired								7.25%
Loans Receivable Maturity Date			May 01, 2023
Construction Or Rehabilitation Loans [Member]
Loans Details [Line Items]
Loans outstanding			$ 0

[1] In March 2022, one loan included in the 2021 table above with principal of approximately $586,000 paid in full, including accrued interest of approximately $37,000.

[2] 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.

[3] Includes Silicon Valley

[4] Interest includes foregone interest of approximately $63,000 on non-accrual loans with monthly payments in arrears. December 2021 interest is due January 1, 2022 and is not included in the payments in arrears at December 31, 2021

[5] Interest includes foregone interest of $42,000 on non-accrual loans past maturity and approximately $21,000 for monthly payments in arrears. December 2020 interest is due January 1, 2021 and is not included in the payments in arrears at December 31, 2020.