Quarterly report pursuant to Section 13 or 15(d)

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

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Our Portfolio - Summary of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables $ 1,131,000   $ 1,167,000  
Allowance 31,000   26,000 $ 8,000
Loans 1,100,000      
Financing receivables, investments, real estate and equity method investments 2,231,000      
Government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 251,000   263,000  
Allowance 0 $ 0 0 0
Loans 250,914     263,175
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 880,000   904,000  
Allowance 31,289 $ 28,831 $ 26,000 25,660
Loans 848,520     896,432
U.S. federal government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 145,000      
State, local, institutions        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 106,000      
Residential solar loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 469,000      
Special purpose subsidiaries        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Noncontrolling equity investments 16,000      
Special purpose subsidiaries | Residential solar loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 370,000      
External credit rating, non investment grade | Leasing arrangement        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables, investments, real estate and equity method investments 47,000      
1 | Government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 251,000      
Allowance 0      
Loans 251,000      
Financing receivables, investments, real estate and equity method investments 287,000      
1 | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 862,000      
Allowance 19,000      
Loans 843,000      
Financing receivables, investments, real estate and equity method investments 1,914,000      
2 | Government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 0      
Allowance 0      
Loans 0      
Financing receivables, investments, real estate and equity method investments 0      
2 | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 10,000      
Allowance 4,000      
Loans 6,000      
Financing receivables, investments, real estate and equity method investments 30,000      
3        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance 8,000     8,000
3 | Government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 0      
Allowance 0      
Loans 0      
Financing receivables, investments, real estate and equity method investments 0      
3 | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 8,000      
Allowance 8,000     $ 8,000
Loans 0      
Financing receivables, investments, real estate and equity method investments $ 0