Investments - Schedule of Unrealized Net Gains (Losses) Recognized in NI on Equity Securities Still Held at Period-End (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Realized Investment Gains Losses [Abstract]
Net gains (losses) recognized in net income during the period on equity securities	$ 1,547	$ 977	$ (5,125)	$ 3,878
Less: Net gains (losses) recognized on equity securities sold	(191)		(191)	(254)
Net gains (losses) recognized in net income on equity securities still held as of period-end	$ 1,738	$ 977	$ (4,934)	$ 4,132