Investments - Schedule of Securities in Unrealized Loss Position (Details) - Fixed Maturities $ in Thousands	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 238,184	$ 178,394
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(10,163)	(1,712)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	16,716	53,836
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(2,452)	(900)
Foreign Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	2,078	11,824
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(19)	(144)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value		8,578
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses		$ (91)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities		14
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities		7
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	4,635	$ 39,379
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(81)	(690)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value		4,000
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses		$ (5)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities		21
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities		4
Corporates [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	144,453	$ 52,474
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(7,563)	(453)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	9,770	21,739
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(2,218)	$ (665)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities		40
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities		19
Residential Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	34,080	$ 40,690
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(305)	(207)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	988	2,071
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(30)	$ (15)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities		20
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities		3
Commercial Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	19,231	$ 11,526
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(773)	(28)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	2,256	12,835
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(54)	$ (71)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities		13
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities		16
Other Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	33,707	$ 22,501
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(1,422)	(190)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	3,702	4,613
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	$ (150)	$ (53)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities		17
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities		20