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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 35 107
Less than 12 months, Fair value $ 29,404 $ 82,130
Less than 12 months, Unrealized losses $ (464) $ (6,045)
12 months or longer, Number of issues | security 471 401
12 months or longer, Fair value $ 596,986 $ 560,745
12 months or longer, Unrealized losses $ (70,851) $ (85,470)
U.S. government obligations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 3 2
Less than 12 months, Fair value $ 9,045 $ 2,721
Less than 12 months, Unrealized losses $ (108) $ (110)
12 months or longer, Number of issues | security 5 5
12 months or longer, Fair value $ 6,811 $ 8,943
12 months or longer, Unrealized losses $ (569) $ (828)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 12 40
Less than 12 months, Fair value $ 1,387 $ 26,563
Less than 12 months, Unrealized losses $ (9) $ (2,910)
12 months or longer, Number of issues | security 287 247
12 months or longer, Fair value $ 365,893 $ 325,992
12 months or longer, Unrealized losses $ (37,088) $ (46,451)
Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 18 64
Less than 12 months, Fair value $ 18,150 $ 52,751
Less than 12 months, Unrealized losses $ (316) $ (2,974)
12 months or longer, Number of issues | security 173 146
12 months or longer, Fair value $ 216,220 $ 219,189
12 months or longer, Unrealized losses $ (31,967) $ (36,733)
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 1 0
Less than 12 months, Fair value $ 293 $ 0
Less than 12 months, Unrealized losses $ (1) $ 0
12 months or longer, Number of issues | security 3 3
12 months or longer, Fair value $ 7,010 $ 6,621
12 months or longer, Unrealized losses $ (1,069) $ (1,458)
Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 1 1
Less than 12 months, Fair value $ 529 $ 95
Less than 12 months, Unrealized losses $ (30) $ (51)
12 months or longer, Number of issues | security 3 0
12 months or longer, Fair value $ 1,052 $ 0
12 months or longer, Unrealized losses $ (158) $ 0