Investments - Schedule of Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, fair value	$ 368,208
Fixed maturity securities, gross unrealized losses	(14,651)
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	329,071	$ 154,118
Fixed maturity securities, less than 12 months, gross unrealized losses	(12,349)	(1,612)
Fixed maturity securities, 12 months or more, fair value	39,137	111,851
Fixed maturity securities, 12 months or more, gross unrealized losses	(2,302)	(986)
Fixed maturity securities, fair value		265,969
Fixed maturity securities, gross unrealized losses		(2,598)
State and municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	33,372	30,028
Fixed maturity securities, less than 12 months, gross unrealized losses	(551)	(741)
Fixed maturity securities, 12 months or more, fair value	0	667
Fixed maturity securities, 12 months or more, gross unrealized losses	0	(1)
Fixed maturity securities, fair value	33,372	30,695
Fixed maturity securities, gross unrealized losses	(551)	(742)
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	27,670	23,632
Fixed maturity securities, less than 12 months, gross unrealized losses	(830)	(78)
Fixed maturity securities, 12 months or more, fair value	27	37,363
Fixed maturity securities, 12 months or more, gross unrealized losses	(1)	(544)
Fixed maturity securities, fair value	27,697	60,995
Fixed maturity securities, gross unrealized losses	(831)	(622)
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	157,118	45,550
Fixed maturity securities, less than 12 months, gross unrealized losses	(3,749)	(365)
Fixed maturity securities, 12 months or more, fair value	1,251	9,933
Fixed maturity securities, 12 months or more, gross unrealized losses	(4)	(24)
Fixed maturity securities, fair value	158,369	55,483
Fixed maturity securities, gross unrealized losses	(3,753)	(389)
Commercial mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	109,143	46,434
Fixed maturity securities, less than 12 months, gross unrealized losses	(6,962)	(406)
Fixed maturity securities, 12 months or more, fair value	37,859	56,720
Fixed maturity securities, 12 months or more, gross unrealized losses	(2,297)	(400)
Fixed maturity securities, fair value	147,002	103,154
Fixed maturity securities, gross unrealized losses	(9,259)	(806)
U.S. Treasury securities and obligations guaranteed by the U.S. government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value		8,474
Fixed maturity securities, less than 12 months, gross unrealized losses		(22)
Fixed maturity securities, 12 months or more, fair value		7,168
Fixed maturity securities, 12 months or more, gross unrealized losses		(17)
Fixed maturity securities, fair value		15,642
Fixed maturity securities, gross unrealized losses		$ (39)
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	1,768
Fixed maturity securities, less than 12 months, gross unrealized losses	(257)
Fixed maturity securities, 12 months or more, fair value	0
Fixed maturity securities, 12 months or more, gross unrealized losses	0
Fixed maturity securities, fair value	1,768
Fixed maturity securities, gross unrealized losses	$ (257)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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