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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value $ 2,949,000   $ 2,949,000   $ 3,124,000
Loan Funding Commitments 455,000   455,000   423,000
Allowance 49,000   49,000   50,000
Loans 2,899,707   2,899,707   3,073,855
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance     50,000    
Ending balance 49,000   49,000    
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 2,914,000   2,914,000   3,033,000
Loan Funding Commitments 455,000   455,000   423,000
Allowance 49,000 $ 51,000 49,000 $ 51,000 50,000
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 48,000 44,000 50,000 41,000  
Provision for loss on receivables 1,000 7,000 (1,000) 10,000  
Ending balance 49,000 51,000 49,000 51,000  
Commercial | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 2,914,000   2,914,000    
Allowance 49,000   49,000    
Loans 2,865,000   2,865,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 49,000   49,000    
Government          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 35,000   35,000   91,000
Loan Funding Commitments 0   0   0
Allowance 0 0 0 0 $ 0
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for loss on receivables 0 0 0 0  
Ending balance 0 $ 0 0 $ 0  
Government | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 35,000   35,000    
Allowance 0   0    
Loans 35,000   35,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 0   0    
Residential Solar Loan          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 1,500,000   1,500,000    
U.S. federal government          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 7,000   7,000    
State or local governments          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans $ 28,000   $ 28,000