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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value $ 2,850,000   $ 2,850,000   $ 2,031,000
Loan Funding Commitments 464,000   464,000   256,000
Allowance 51,000   51,000   41,000
Loans 2,799,000   2,799,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance     41,000    
Ending balance 51,000   51,000    
Commercial receivables          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 2,757,000   2,757,000   1,928,000
Loan Funding Commitments 464,000   464,000   256,000
Allowance 51,000 $ 34,000 51,000 $ 34,000 41,000
Loans 2,705,976   2,705,976   1,887,483
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 44,000 37,000 41,000 36,000  
Provision for loss on receivables 7,000 (3,000) 10,000 6,000  
Write-off of allowance     0 (8,000)  
Ending balance 51,000 34,000 51,000 34,000  
Commercial receivables | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 2,757,000   2,757,000    
Allowance 51,000   51,000    
Loans 2,706,000   2,706,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 51,000   51,000    
Government receivables          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 93,000   93,000   103,000
Loan Funding Commitments 0   0   0
Allowance 0 0 0 0 0
Loans 93,364   93,364   $ 102,511
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for loss on receivables 0 0 0 0  
Write-off of allowance     0 0  
Ending balance 0 $ 0 0 $ 0  
Government receivables | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 93,000   93,000    
Allowance 0   0    
Loans 93,000   93,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 0   0    
Residential solar loan          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 1,400,000   1,400,000    
U.S. federal government          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 10,000   10,000    
State or local governments          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans $ 83,000   $ 83,000