Quarterly report pursuant to Section 13 or 15(d)

Financing Receivables - Components (Details)

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Financing Receivables - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Participation interest in loan pool 5.00%    
Amounts outstanding $ 24,056 $ 56,073  
Unamortized discount (287) (310)  
Allowance for credit losses (2,470) (6,838)  
Carrying value 21,299 48,925  
Advances      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amounts outstanding 20,349 52,129  
Unamortized discount 0 0  
Allowance for credit losses (2,319) (6,736) $ (505)
Carrying value 18,030 45,393  
Advances, Not Associated with Specific Installation Projects      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for credit losses (100) (100)  
Carrying value 1,500 1,500  
Loans and Loan Participations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amounts outstanding 3,707 3,944  
Unamortized discount (287) (310)  
Allowance for credit losses (151) (102) (73)
Carrying value $ 3,269 3,532 $ 4,126
Residential Solar Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Participation interest in loan pool 5.00%    
Amounts outstanding $ 3,400 3,600  
Indirect Channel Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amounts outstanding $ 300 $ 300