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Financing Receivables - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Participation interest in loan pool 5.00%      
Amounts outstanding $ 91,158 $ 71,952    
Unamortized discount (369) (414)    
Allowance for credit losses (578) (386)    
Carrying value 90,211 71,152    
Advances        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amounts outstanding 86,590 67,077    
Unamortized discount 0 0    
Allowance for credit losses (505) (238) $ (101) $ (121)
Carrying value 86,085 66,839    
Advances, not associated with specific installation projects        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value 10,500 9,000    
Loans and Loan Participations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amounts outstanding 4,568 4,875    
Unamortized discount (369) (414)    
Allowance for credit losses (73) (148) (114) (125)
Carrying value $ 4,126 4,313 $ 5,065 $ 5,333
Residential solar loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Participation interest in loan pool 5.00%   5.00%  
Amounts outstanding $ 4,300 4,600    
Indirect Channel Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amounts outstanding $ 300 $ 300