Investments AFS - Allowance Rollforward Table (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 1,574	$ 0
Additional increases (decreases) for securities in which a previous allowance or credit loss was recorded	117	1,691
Balance, end of period	$ 1,691	$ 1,691