Investments - Schedule of Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, fair value	$ 138,100
Fixed maturity securities, gross unrealized losses	(2,600)
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	99,737	$ 154,118
Fixed maturity securities, less than 12 months, gross unrealized losses	(2,070)	(1,612)
Fixed maturity securities, 12 months or more, fair value	38,344	111,851
Fixed maturity securities, 12 months or more, gross unrealized losses	(549)	(986)
Fixed maturity securities, fair value	138,081	265,969
Fixed maturity securities, gross unrealized losses	(2,619)	(2,598)
State and municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	17,967	30,028
Fixed maturity securities, less than 12 months, gross unrealized losses	(106)	(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	17,967	30,695
Fixed maturity securities, gross unrealized losses	(106)	(742)
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	14,601	23,632
Fixed maturity securities, less than 12 months, gross unrealized losses	(54)	(78)
Fixed maturity securities, 12 months or more, fair value	0	37,363
Fixed maturity securities, 12 months or more, gross unrealized losses	0	(544)
Fixed maturity securities, fair value	14,601	60,995
Fixed maturity securities, gross unrealized losses	(54)	(622)
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	41,182	45,550
Fixed maturity securities, less than 12 months, gross unrealized losses	(790)	(365)
Fixed maturity securities, 12 months or more, fair value	0	9,933
Fixed maturity securities, 12 months or more, gross unrealized losses	0	(24)
Fixed maturity securities, fair value	41,182	55,483
Fixed maturity securities, gross unrealized losses	(790)	(389)
Commercial mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	23,964	46,434
Fixed maturity securities, less than 12 months, gross unrealized losses	(1,118)	(406)
Fixed maturity securities, 12 months or more, fair value	38,344	56,720
Fixed maturity securities, 12 months or more, gross unrealized losses	(549)	(400)
Fixed maturity securities, fair value	62,308	103,154
Fixed maturity securities, gross unrealized losses	(1,667)	(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	2,023
Fixed maturity securities, less than 12 months, gross unrealized losses	(2)
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	2,023
Fixed maturity securities, gross unrealized losses	$ (2)

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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