Quarterly report pursuant to Section 13 or 15(d)

Financing Receivables - Concentrations by State (Details)

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Financing Receivables - Concentrations by State (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
state
Dec. 31, 2020
USD ($)
state
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding $ 76,544 $ 41,752
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% 18.90%
Financing Receivable | Geographic Concentration Risk | California    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 17.50% 17.50%
Financing Receivable | Geographic Concentration Risk | Florida    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 8.70% 8.70%
Financing Receivable | Geographic Concentration Risk | New York    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 6.50% 6.30%
Financing Receivable | Geographic Concentration Risk | New Jersey    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 6.10% 5.90%
Financing Receivable | Geographic Concentration Risk | Arizona    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 4.50% 4.90%
Financing Receivable | Geographic Concentration Risk | Pennsylvania    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 4.20% 4.30%
Financing Receivable | Geographic Concentration Risk | Massachusetts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 3.90% 3.50%
Financing Receivable | Geographic Concentration Risk | Missouri    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 3.60% 3.60%
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 | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
% of total 22.40% 22.70%
Loans and Loan Participations    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding $ 5,234 $ 6,351
Loans and Loan Participations | Texas    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 994 1,203
Loans and Loan Participations | California    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 916 1,111
Loans and Loan Participations | Florida    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 454 555
Loans and Loan Participations | New York    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 340 403
Loans and Loan Participations | New Jersey    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 320 376
Loans and Loan Participations | Arizona    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 237 312
Loans and Loan Participations | Pennsylvania    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 219 274
Loans and Loan Participations | Massachusetts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 205 223
Loans and Loan Participations | Missouri    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 190 228
Loans and Loan Participations | South Carolina    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding 189 234
Loans and Loan Participations | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amounts outstanding $ 1,170 $ 1,432
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% 2.70%