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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value $ 57,210 $ 29,404
Less than 12 months, Unrealized losses (642) (464)
12 months or longer, Fair value 529,564 596,986
12 months or longer, Unrealized losses (50,143) (70,851)
U.S. government obligations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 0 9,045
Less than 12 months, Unrealized losses 0 (108)
12 months or longer, Fair value 2,774 6,811
12 months or longer, Unrealized losses (332) (569)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 30,149 1,387
Less than 12 months, Unrealized losses (159) (9)
12 months or longer, Fair value 326,540 365,893
12 months or longer, Unrealized losses (24,410) (37,088)
Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 26,770 18,150
Less than 12 months, Unrealized losses (480) (316)
12 months or longer, Fair value 189,663 216,220
12 months or longer, Unrealized losses (24,350) (31,967)
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 291 293
Less than 12 months, Unrealized losses (3) (1)
12 months or longer, Fair value 9,467 7,010
12 months or longer, Unrealized losses (961) (1,069)
Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 0 529
Less than 12 months, Unrealized losses 0 (30)
12 months or longer, Fair value 1,120 1,052
12 months or longer, Unrealized losses $ (90) $ (158)