Concentration - By Company (Details)	Sep. 30, 2020	Dec. 31, 2019
John Hancock Life Insurance Company
Concentration Risk [Line Items]
Face value percentage of insurance policies with specific life insurance companies	14.66%	14.23%
The Lincoln National Life Insurance Company
Concentration Risk [Line Items]
Face value percentage of insurance policies with specific life insurance companies	11.23%	11.55%
AXA Equitable Life Insurance Company
Concentration Risk [Line Items]
Face value percentage of insurance policies with specific life insurance companies	10.72%	10.63%