Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Schedule of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details)

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Our Portfolio - Schedule of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value $ 3,165,000   $ 3,124,000
Loan Funding Commitments 388,000   423,000
Allowance 52,000   50,000
Loans 3,112,810   3,073,855
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 50,000    
Ending balance 52,000    
Receivables      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 3,128,000   3,033,000
Loan Funding Commitments 388,000   423,000
Allowance 52,000 $ 43,000 50,000
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 50,000 41,000  
Provision for loss on receivables 2,000 2,000  
Ending balance 52,000 43,000  
Receivables | 1      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 3,128,000    
Allowance 52,000    
Loans 3,076,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance 52,000    
Government receivables      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 37,000   91,000
Loan Funding Commitments 0   0
Allowance 0 0 $ 0
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0 0  
Provision for loss on receivables 0 0  
Ending balance 0 $ 0  
Government receivables | 1      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 37,000    
Allowance 0    
Loans 37,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance 0    
Residential solar loan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans 1,600,000    
U.S. federal government      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans 9,000    
State or local governments      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans $ 28,000