Financing Receivables - Concentrations by State (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) state	Mar. 31, 2021	Dec. 31, 2021 USD ($) state
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	$ 91,158		$ 71,952
Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	100.00%		100.00%
Financing Receivable | Geographic Concentration Risk | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	19.00%		19.10%
Financing Receivable | Geographic Concentration Risk | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	17.90%		17.80%
Financing Receivable | Geographic Concentration Risk | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	8.60%		8.70%
Financing Receivable | Geographic Concentration Risk | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	6.70%		6.70%
Financing Receivable | Geographic Concentration Risk | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	6.20%		6.20%
Financing Receivable | Geographic Concentration Risk | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	4.50%		4.50%
Financing Receivable | Geographic Concentration Risk | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	4.20%		4.10%
Financing Receivable | Geographic Concentration Risk | Pennsylvania
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	4.10%		4.10%
Financing Receivable | Geographic Concentration Risk | South Carolina
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	3.60%		3.70%
Financing Receivable | Geographic Concentration Risk | Missouri
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	2.80%		2.80%
Financing Receivable | Geographic Concentration Risk | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	22.40%		22.30%
Loans and Loan Participations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	$ 4,568		$ 4,875
Loans and Loan Participations | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	870		930
Loans and Loan Participations | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	819		867
Loans and Loan Participations | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	391		423
Loans and Loan Participations | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	305		325
Loans and Loan Participations | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	284		302
Loans and Loan Participations | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	205		220
Loans and Loan Participations | Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	194		201
Loans and Loan Participations | Pennsylvania
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	186		202
Loans and Loan Participations | South Carolina
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	166		178
Loans and Loan Participations | Missouri
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	129		135
Loans and Loan Participations | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	$ 1,019		$ 1,092
Loans and Loan Participations | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of states not individually disclosed | state	31		31
Threshold percentage for disclosing individually	2.60%	2.60%