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Summary of Significant Accounting Policies - Additional Information (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
segment
reporting_unit
Dec. 31, 2021
USD ($)
Jul. 09, 2021
Mar. 31, 2021
Noncontrolling Interest [Line Items]        
Number of operating segments | segment 1      
Number of reportable segments | segment 1      
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Participation interest in loan pool 5.00%      
Nonaccrual loans, threshold for impairment evaluation $ 50,000      
Troubled debt restructuring receivables, threshold for impairment evaluation $ 50,000      
Number of reporting units | reporting_unit 1      
Funding commitments $ 16,643,000 $ 22,749,000    
Sunlight Financial LLC        
Noncontrolling Interest [Line Items]        
Noncontrolling interest percent 35.10% 35.00% 34.90%  
Residential solar loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Participation interest in loan pool 5.00%     5.00%