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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 43 205
Debt securities, greater than 12 months, number of issues | Security 290 133
Debt securities, number of issues | Security 333 338
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 5,148 $ 38,757
Debt securities, greater than 12 months, fair value 100,673 71,142
Debt securities, fair value 105,821 109,899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (91) (4,857)
Debt securities, greater than 12 months, unrealized losses (15,281) (12,062)
Debt securities, total unrealized losses $ (15,372) $ (16,919)
U.S. Government    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 3 8
Debt securities, greater than 12 months, number of issues | Security 9 5
Debt securities, number of issues | Security 12 13
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,882 $ 3,534
Debt securities, greater than 12 months, fair value 4,068 3,964
Debt securities, fair value 5,950 7,498
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (35) (135)
Debt securities, greater than 12 months, unrealized losses (243) (200)
Debt securities, total unrealized losses $ (278) $ (335)
State and local government    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 9 77
Debt securities, greater than 12 months, number of issues | Security 114 45
Debt securities, number of issues | Security 123 122
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 2,643 $ 12,966
Debt securities, greater than 12 months, fair value 18,879 7,147
Debt securities, fair value 21,522 20,113
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (40) (2,318)
Debt securities, greater than 12 months, unrealized losses (3,913) (2,354)
Debt securities, total unrealized losses $ (3,953) $ (4,672)
Corporate debt    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 2 27
Debt securities, greater than 12 months, number of issues | Security 64 42
Debt securities, number of issues | Security 66 69
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 346 $ 10,069
Debt securities, greater than 12 months, fair value 29,266 20,890
Debt securities, fair value 29,612 30,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (4) (1,373)
Debt securities, greater than 12 months, unrealized losses (4,430) (3,415)
Debt securities, total unrealized losses $ (4,434) $ (4,788)
Asset-backed securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 0 6
Debt securities, greater than 12 months, number of issues | Security 25 20
Debt securities, number of issues | Security 25 26
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 3,188
Debt securities, greater than 12 months, fair value 19,523 17,308
Debt securities, fair value 19,523 20,496
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (76)
Debt securities, greater than 12 months, unrealized losses (1,027) (1,170)
Debt securities, total unrealized losses $ (1,027) $ (1,246)
Mortgage-backed securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 22 57
Debt securities, greater than 12 months, number of issues | Security 48 12
Debt securities, number of issues | Security 70 69
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 140 $ 4,006
Debt securities, greater than 12 months, fair value 22,746 20,031
Debt securities, fair value 22,886 24,037
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (5) (573)
Debt securities, greater than 12 months, unrealized losses (4,989) (4,584)
Debt securities, total unrealized losses $ (4,994) $ (5,157)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 0 4
Debt securities, greater than 12 months, number of issues | Security 4 0
Debt securities, number of issues | Security 4 4
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 3,205
Debt securities, greater than 12 months, fair value 3,238 0
Debt securities, fair value 3,238 3,205
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (186)
Debt securities, greater than 12 months, unrealized losses (151) 0
Debt securities, total unrealized losses $ (151) $ (186)
Collateralized mortgage obligations    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 7 26
Debt securities, greater than 12 months, number of issues | Security 26 9
Debt securities, number of issues | Security 33 35
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 137 $ 1,789
Debt securities, greater than 12 months, fair value 2,953 1,802
Debt securities, fair value 3,090 3,591
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (7) (196)
Debt securities, greater than 12 months, unrealized losses (528) (339)
Debt securities, total unrealized losses $ (535) $ (535)