Investments - Amortized Cost, Fair Value and Unrealized Gains and (Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Net Investment Income [Line Items]
Amortized Cost	$ 123,011	$ 97,812
Gross unrealized, gains	20	56
Gross unrealized, losses	(7,663)	(6,227)
Fair Value	115,368	91,641
U.S. Treasuries
Net Investment Income [Line Items]
Amortized Cost	32,651	35,637
Gross unrealized, gains	15	5
Gross unrealized, losses	(600)	(320)
Fair Value	32,066	35,322
Obligations of states, municipalities and political subdivisions
Net Investment Income [Line Items]
Amortized Cost	14,939	11,549
Gross unrealized, gains	0	2
Gross unrealized, losses	(1,405)	(1,326)
Fair Value	13,534	10,225
Corporate bonds
Net Investment Income [Line Items]
Amortized Cost	47,258	31,032
Gross unrealized, gains	2	32
Gross unrealized, losses	(3,634)	(2,837)
Fair Value	43,626	28,227
Residential and commercial mortgage-backed securities
Net Investment Income [Line Items]
Amortized Cost	24,173	12,790
Gross unrealized, gains	3	11
Gross unrealized, losses	(1,648)	(1,268)
Fair Value	22,528	11,533
Other loan-backed and structured securities
Net Investment Income [Line Items]
Amortized Cost	3,990	6,804
Gross unrealized, gains	0	6
Gross unrealized, losses	(376)	(476)
Fair Value	$ 3,614	$ 6,334