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Investments - Security Holdings in an Unrealized Loss Position - Tabular Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value
Fair Value - Less Than 12 Months	$ 384,693	$ 160,773
Fair Value - More Than 12 Months	99,986	9,346
Fair Value - Total	484,679	170,119
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(31,558)	(2,188)
Unrealized Losses - More Than 12 Months	(15,365)	(517)
Unrealized Losses - Total	(46,923)	(2,705)
U.S. Governments
Fair Value
Fair Value - Less Than 12 Months	41,077	5,968
Fair Value - More Than 12 Months	6,853	1,457
Fair Value - Total	47,930	7,425
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(1,523)	(147)
Unrealized Losses - More Than 12 Months	(730)	(43)
Unrealized Losses - Total	(2,253)	(190)
States, territories, and possessions
Fair Value
Fair Value - Less Than 12 Months	3,227	1,444
Fair Value - Total	3,227	1,444
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(552)	(63)
Unrealized Losses - Total	(552)	(63)
Political subdivisions
Fair Value
Fair Value - Less Than 12 Months	4,298	1,815
Fair Value - Total	4,298	1,815
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(621)	(22)
Unrealized Losses - Total	(621)	(22)
Special revenue excluding mortgage/asset-backed securities
Fair Value
Fair Value - Less Than 12 Months	25,091	6,280
Fair Value - More Than 12 Months	5,080
Fair Value - Total	30,171	6,280
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(3,287)	(76)
Unrealized Losses - More Than 12 Months	(1,200)
Unrealized Losses - Total	(4,487)	(76)
Industrial and miscellaneous
Fair Value
Fair Value - Less Than 12 Months	192,185	94,020
Fair Value - More Than 12 Months	55,605	5,570
Fair Value - Total	247,790	99,590
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(15,667)	(1,468)
Unrealized Losses - More Than 12 Months	(8,481)	(423)
Unrealized Losses - Total	(24,148)	(1,891)
Mortgage/asset-backed securities
Fair Value
Fair Value - Less Than 12 Months	118,815	51,246
Fair Value - More Than 12 Months	32,448	2,319
Fair Value - Total	151,263	53,565
Unrealized Losses
Unrealized Losses - Less Than 12 Months	(9,908)	(412)
Unrealized Losses - More Than 12 Months	(4,954)	(51)
Unrealized Losses - Total	$ (14,862)	$ (463)

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