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Investments - Schedule of Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value    
Less than 12 Months of Fair value $ 79,375 $ 112,840
12 Months or Greater of Fair Value 176,895 189,847
Total, Fair Value 256,270 302,687
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (162) (989)
12 Months or Greater of Gross Unrealized Losses (9,897) (14,800)
Total, Gross Unrealized Losses (10,059) (15,789)
U.S. government and government agency    
Fair Value    
Less than 12 Months of Fair value 30,291 48,598
12 Months or Greater of Fair Value 15,195 10,970
Total, Fair Value 45,486 59,568
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (17) (69)
12 Months or Greater of Gross Unrealized Losses (37) (263)
Total, Gross Unrealized Losses (54) (332)
State and municipal    
Fair Value    
Less than 12 Months of Fair value 523 2,992
12 Months or Greater of Fair Value 46,911 47,728
Total, Fair Value 47,434 50,720
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (3) (14)
12 Months or Greater of Gross Unrealized Losses (3,563) (5,250)
Total, Gross Unrealized Losses (3,566) (5,264)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 Months of Fair value 843 2,485
12 Months or Greater of Fair Value 17,194 18,423
Total, Fair Value 18,037 20,908
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (2) (53)
12 Months or Greater of Gross Unrealized Losses (678) (1,113)
Total, Gross Unrealized Losses (680) (1,166)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months of Fair value 13,139 17,536
12 Months or Greater of Fair Value 31,982 31,502
Total, Fair Value 45,121 49,038
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (46) (609)
12 Months or Greater of Gross Unrealized Losses (3,723) (4,401)
Total, Gross Unrealized Losses (3,769) (5,010)
Asset-backed securities    
Fair Value    
Less than 12 Months of Fair value 19,846 16,253
12 Months or Greater of Fair Value 10,604 18,491
Total, Fair Value 30,450 34,744
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (66) (71)
12 Months or Greater of Gross Unrealized Losses (409) (892)
Total, Gross Unrealized Losses (475) (963)
Corporate    
Fair Value    
Less than 12 Months of Fair value 14,733 24,976
12 Months or Greater of Fair Value 55,009 62,733
Total, Fair Value 69,742 87,709
Gross Unrealized Losses    
Less than 12 Months of Gross Unrealized Losses (28) (173)
12 Months or Greater of Gross Unrealized Losses (1,487) (2,881)
Total, Gross Unrealized Losses $ (1,515) $ (3,054)