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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 81 107
Less than 12 months, Fair value $ 79,355 $ 82,130
Less than 12 months, Unrealized losses $ (2,002) $ (6,045)
12 months or longer, Number of issues | security 444 401
12 months or longer, Fair value $ 558,915 $ 560,745
12 months or longer, Unrealized losses $ (80,006) $ (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 4 2
Less than 12 months, Fair value $ 9,744 $ 2,721
Less than 12 months, Unrealized losses $ (231) $ (110)
12 months or longer, Number of issues | security 6 5
12 months or longer, Fair value $ 11,831 $ 8,943
12 months or longer, Unrealized losses $ (769) $ (828)
Fixed Maturities | Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 35 40
Less than 12 months, Fair value $ 20,399 $ 26,563
Less than 12 months, Unrealized losses $ (457) $ (2,910)
12 months or longer, Number of issues | security 256 247
12 months or longer, Fair value $ 317,257 $ 325,992
12 months or longer, Unrealized losses $ (41,497) $ (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 $ 47,334 $ 52,751
Less than 12 months, Unrealized losses $ (1,211) $ (2,974)
12 months or longer, Number of issues | security 177 146
12 months or longer, Fair value $ 222,783 $ 219,189
12 months or longer, Unrealized losses $ (36,431) $ (36,733)
Fixed Maturities | Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 2 0
Less than 12 months, Fair value $ 1,113 $ 0
Less than 12 months, Unrealized losses $ (10) $ 0
12 months or longer, Number of issues | security 3 3
12 months or longer, Fair value $ 6,832 $ 6,621
12 months or longer, Unrealized losses $ (1,247) $ (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 $ 765 $ 95
Less than 12 months, Unrealized losses $ (93) $ (51)
12 months or longer, Number of issues | security 2 0
12 months or longer, Fair value $ 212 $ 0
12 months or longer, Unrealized losses $ (62) $ 0