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Summary of Investments - Fair Value of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fixed maturities:
Amortized Cost	$ 1,895,582	$ 1,771,041
Gross Unrealized Gain	2,299	6,810
Gross Unrealized Loss	101,748	91,348
Allowance for Credit Losses	0	1
Fair Value	1,796,133	1,686,502
U.S. Treasury
Fixed maturities:
Amortized Cost	51,211	51,211
Gross Unrealized Gain	56	325
Gross Unrealized Loss	618	675
Allowance for Credit Losses	0	0
Fair Value	50,649	50,861
U.S. government agency
Fixed maturities:
Amortized Cost	97,438	102,540
Gross Unrealized Gain	57	255
Gross Unrealized Loss	9,154	8,302
Allowance for Credit Losses	0	0
Fair Value	88,341	94,493
General obligations | Midwest
Fixed maturities:
Amortized Cost	38,918	52,712
Gross Unrealized Gain	0	132
Gross Unrealized Loss	469	137
Allowance for Credit Losses	0	0
Fair Value	38,449	52,707
General obligations | Northeast
Fixed maturities:
Amortized Cost	7,121	11,422
Gross Unrealized Gain	0	1
Gross Unrealized Loss	122	43
Allowance for Credit Losses	0	0
Fair Value	6,999	11,380
General obligations | South
Fixed maturities:
Amortized Cost	36,875	54,560
Gross Unrealized Gain	0	47
Gross Unrealized Loss	768	400
Allowance for Credit Losses	0	0
Fair Value	36,107	54,207
General obligations | West
Fixed maturities:
Amortized Cost	58,789	77,874
Gross Unrealized Gain	35	23
Gross Unrealized Loss	939	471
Allowance for Credit Losses	0	0
Fair Value	57,885	77,426
Special revenue | Midwest
Fixed maturities:
Amortized Cost	64,440	101,037
Gross Unrealized Gain	2	302
Gross Unrealized Loss	729	358
Allowance for Credit Losses	0	0
Fair Value	63,713	100,981
Special revenue | Northeast
Fixed maturities:
Amortized Cost	50,012	52,708
Gross Unrealized Gain	23	79
Gross Unrealized Loss	767	560
Allowance for Credit Losses	0	0
Fair Value	49,268	52,227
Special revenue | South
Fixed maturities:
Amortized Cost	121,547	166,119
Gross Unrealized Gain	21	302
Gross Unrealized Loss	2,932	2,155
Allowance for Credit Losses	0	0
Fair Value	118,636	164,266
Special revenue | West
Fixed maturities:
Amortized Cost	86,246	102,254
Gross Unrealized Gain	8	147
Gross Unrealized Loss	1,485	836
Allowance for Credit Losses	0	0
Fair Value	84,769	101,565
Foreign bonds
Fixed maturities:
Amortized Cost	16,210	21,255
Gross Unrealized Gain	11	0
Gross Unrealized Loss	1,083	2,083
Allowance for Credit Losses	0	0
Fair Value	15,138	19,172
Public utilities
Fixed maturities:
Amortized Cost	141,202	149,734
Gross Unrealized Gain	286	787
Gross Unrealized Loss	10,720	10,054
Allowance for Credit Losses	0	0
Fair Value	130,768	140,467
Corporate bonds | Energy
Fixed maturities:
Amortized Cost	41,879	45,351
Gross Unrealized Gain	3	249
Gross Unrealized Loss	2,245	2,127
Allowance for Credit Losses	0	0
Fair Value	39,637	43,473
Corporate bonds | Industrials
Fixed maturities:
Amortized Cost	58,647	74,760
Gross Unrealized Gain	86	727
Gross Unrealized Loss	5,011	4,939
Allowance for Credit Losses	0	0
Fair Value	53,722	70,548
Corporate bonds | Consumer goods and services
Fixed maturities:
Amortized Cost	101,945	103,315
Gross Unrealized Gain	52	271
Gross Unrealized Loss	8,675	7,665
Allowance for Credit Losses	0	0
Fair Value	93,322	95,921
Corporate bonds | Health care
Fixed maturities:
Amortized Cost	31,795	37,872
Gross Unrealized Gain	0	99
Gross Unrealized Loss	4,939	4,499
Allowance for Credit Losses	0	0
Fair Value	26,856	33,472
Corporate bonds | Technology, media and telecommunications
Fixed maturities:
Amortized Cost	82,279	87,002
Gross Unrealized Gain	0	451
Gross Unrealized Loss	7,305	5,665
Allowance for Credit Losses	0	0
Fair Value	74,974	81,788
Corporate bonds | Financial services
Fixed maturities:
Amortized Cost	233,099	152,329
Gross Unrealized Gain	852	743
Gross Unrealized Loss	6,379	7,381
Allowance for Credit Losses	0	1
Fair Value	227,572	145,690
Mortgage-backed securities
Fixed maturities:
Amortized Cost	219,159	23,800
Gross Unrealized Gain	500	11
Gross Unrealized Loss	3,380	2,328
Allowance for Credit Losses	0	0
Fair Value	216,279	21,483
Collateralized mortgage obligations | Government National Mortgage Association
Fixed maturities:
Amortized Cost	151,577	164,666
Gross Unrealized Gain	161	1,282
Gross Unrealized Loss	14,138	12,742
Allowance for Credit Losses	0	0
Fair Value	137,600	153,206
Collateralized mortgage obligations | Federal Home Loan Mortgage Corporation
Fixed maturities:
Amortized Cost	79,811	84,842
Gross Unrealized Gain	0	20
Gross Unrealized Loss	14,502	13,177
Allowance for Credit Losses	0	0
Fair Value	65,309	71,685
Collateralized mortgage obligations | Federal National Mortgage Association
Fixed maturities:
Amortized Cost	46,395	50,284
Gross Unrealized Gain	23	33
Gross Unrealized Loss	5,201	4,664
Allowance for Credit Losses	0	0
Fair Value	41,217	45,653
Asset-backed securities
Fixed maturities:
Amortized Cost	78,987	3,394
Gross Unrealized Gain	123	524
Gross Unrealized Loss	187	87
Allowance for Credit Losses	0	0
Fair Value	$ 78,923	$ 3,831

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