Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Footnotes) (Details)

v3.19.1
Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Footnotes) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
transaction
Dec. 31, 2018
USD ($)
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables on non accrual status $ 0 $ 0
Number of transactions | transaction 170  
Financial receivable outstanding $ 10,000,000  
Total aggregate remaining balance 61,000,000  
Maximum [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financial receivable outstanding 1,000,000  
Commercial Non-Investment Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Increase in finance receivables 18,000,000  
Financing receivables on non accrual status 8,000,000  
Financial receivable outstanding 14,000,000  
Investment Grade by Independent Rating Agency [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total financing receivable 9,000,000  
U.S. Federal Government [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total financing receivable 382,000,000  
State, Local, Institutions [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total financing receivable 187,000,000  
Residential Solar Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable $ 260,000,000