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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 68 107
Less than 12 months, Fair value $ 90,055 $ 82,130
Less than 12 months, Unrealized losses $ (2,421) $ (6,045)
12 months or longer, Number of issues | security 494 401
12 months or longer, Fair value $ 597,178 $ 560,745
12 months or longer, Unrealized losses $ (97,279) $ (85,470)
Fixed Maturities | U.S. government obligations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 8 2
Less than 12 months, Fair value $ 20,094 $ 2,721
Less than 12 months, Unrealized losses $ (457) $ (110)
12 months or longer, Number of issues | security 5 5
12 months or longer, Fair value $ 6,645 $ 8,943
12 months or longer, Unrealized losses $ (734) $ (828)
Fixed Maturities | Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 17 40
Less than 12 months, Fair value $ 6,768 $ 26,563
Less than 12 months, Unrealized losses $ (47) $ (2,910)
12 months or longer, Number of issues | security 296 247
12 months or longer, Fair value $ 362,421 $ 325,992
12 months or longer, Unrealized losses $ (52,225) $ (46,451)
Fixed Maturities | Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 38 64
Less than 12 months, Fair value $ 60,995 $ 52,751
Less than 12 months, Unrealized losses $ (1,813) $ (2,974)
12 months or longer, Number of issues | security 186 146
12 months or longer, Fair value $ 220,254 $ 219,189
12 months or longer, Unrealized losses $ (42,762) $ (36,733)
Fixed Maturities | Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 3 0
Less than 12 months, Fair value $ 1,414 $ 0
Less than 12 months, Unrealized losses $ (30) $ 0
12 months or longer, Number of issues | security 3 3
12 months or longer, Fair value $ 6,756 $ 6,621
12 months or longer, Unrealized losses $ (1,323) $ (1,458)
Fixed Maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 2 1
Less than 12 months, Fair value $ 784 $ 95
Less than 12 months, Unrealized losses $ (74) $ (51)
12 months or longer, Number of issues | security 4 0
12 months or longer, Fair value $ 1,102 $ 0
12 months or longer, Unrealized losses $ (235) $ 0