Investments - Securities with Gross Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2023 USD ($) item security	Dec. 31, 2022 USD ($) security
Net Investment Income [Line Items]
Less Than Twelve Months, Gross Unrealized Loss	$ (1,140)	$ (3,725)
Less Than Twelve Months, Fair Value	35,533	44,735
Twelve Months or Greater, Gross Unrealized Loss	(4,302)	(2,502)
Twelve Months or Greater, Fair Value	36,563	29,702
Total, Gross Unrealized Loss	(5,442)	(6,227)
Total, Fair Value	$ 72,096	$ 74,437
Number of securities in an unrealized loss position | security	452	483
Unrealized loss position for 12 months or longer | item	363
U.S. Treasuries
Net Investment Income [Line Items]
Less Than Twelve Months, Gross Unrealized Loss	$ (66)	$ (127)
Less Than Twelve Months, Fair Value	16,320	10,748
Twelve Months or Greater, Gross Unrealized Loss	(160)	(193)
Twelve Months or Greater, Fair Value	2,251	9,824
Total, Gross Unrealized Loss	(226)	(320)
Total, Fair Value	18,571	20,572
Obligations of states, municipalities and political subdivisions
Net Investment Income [Line Items]
Less Than Twelve Months, Gross Unrealized Loss	(48)	(929)
Less Than Twelve Months, Fair Value	1,936	6,258
Twelve Months or Greater, Gross Unrealized Loss	(1,006)	(397)
Twelve Months or Greater, Fair Value	7,852	3,504
Total, Gross Unrealized Loss	(1,054)	(1,326)
Total, Fair Value	9,788	9,762
Corporate Bonds
Net Investment Income [Line Items]
Less Than Twelve Months, Gross Unrealized Loss	(617)	(1,623)
Less Than Twelve Months, Fair Value	12,375	16,531
Twelve Months or Greater, Gross Unrealized Loss	(1,993)	(1,214)
Twelve Months or Greater, Fair Value	15,615	10,328
Total, Gross Unrealized Loss	(2,610)	(2,837)
Total, Fair Value	27,990	26,859
Residential and commercial mortgage-backed securities
Net Investment Income [Line Items]
Less Than Twelve Months, Gross Unrealized Loss	(260)	(687)
Less Than Twelve Months, Fair Value	3,190	6,565
Twelve Months or Greater, Gross Unrealized Loss	(902)	(581)
Twelve Months or Greater, Fair Value	7,149	4,952
Total, Gross Unrealized Loss	(1,162)	(1,268)
Total, Fair Value	10,339	11,517
Other loan-backed and structured securities
Net Investment Income [Line Items]
Less Than Twelve Months, Gross Unrealized Loss	(149)	(359)
Less Than Twelve Months, Fair Value	1,712	4,633
Twelve Months or Greater, Gross Unrealized Loss	(241)	(117)
Twelve Months or Greater, Fair Value	3,696	1,094
Total, Gross Unrealized Loss	(390)	(476)
Total, Fair Value	$ 5,408	$ 5,727