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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Sep. 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 14 205
Debt securities, greater than 12 months, number of issues | Security 315 133
Debt securities, number of issues | Security 329 338
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 3,040 $ 38,757
Debt securities, greater than 12 months, fair value 98,505 71,142
Debt securities, fair value 101,545 109,899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (70) (4,857)
Debt securities, greater than 12 months, unrealized losses (17,684) (12,062)
Debt securities, total unrealized losses $ (17,754) $ (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 10 5
Debt securities, number of issues | Security 13 13
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,808 $ 3,534
Debt securities, greater than 12 months, fair value 4,330 3,964
Debt securities, fair value 6,138 7,498
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (45) (135)
Debt securities, greater than 12 months, unrealized losses (227) (200)
Debt securities, total unrealized losses $ (272) $ (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 3 77
Debt securities, greater than 12 months, number of issues | Security 117 45
Debt securities, number of issues | Security 120 122
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,179 $ 12,966
Debt securities, greater than 12 months, fair value 18,686 7,147
Debt securities, fair value 19,865 20,113
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (23) (2,318)
Debt securities, greater than 12 months, unrealized losses (4,928) (2,354)
Debt securities, total unrealized losses $ (4,951) $ (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 0 27
Debt securities, greater than 12 months, number of issues | Security 66 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 $ 0 $ 10,069
Debt securities, greater than 12 months, fair value 29,126 20,890
Debt securities, fair value 29,126 30,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (1,373)
Debt securities, greater than 12 months, unrealized losses (4,898) (3,415)
Debt securities, total unrealized losses $ (4,898) $ (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 24 20
Debt securities, number of issues | Security 24 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 19,119 17,308
Debt securities, fair value 19,119 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 (837) (1,170)
Debt securities, total unrealized losses $ (837) $ (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 6 57
Debt securities, greater than 12 months, number of issues | Security 63 12
Debt securities, number of issues | Security 69 69
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 39 $ 4,006
Debt securities, greater than 12 months, fair value 21,152 20,031
Debt securities, fair value 21,191 24,037
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (2) (573)
Debt securities, greater than 12 months, unrealized losses (6,113) (4,584)
Debt securities, total unrealized losses $ (6,115) $ (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 3,248 0
Debt securities, fair value 3,248 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 (139) 0
Debt securities, total unrealized losses $ (139) $ (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 2 26
Debt securities, greater than 12 months, number of issues | Security 31 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 $ 14 $ 1,789
Debt securities, greater than 12 months, fair value 2,844 1,802
Debt securities, fair value 2,858 3,591
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (196)
Debt securities, greater than 12 months, unrealized losses (542) (339)
Debt securities, total unrealized losses $ (542) $ (535)