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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Security
Dec. 31, 2023
USD ($)
Security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | Security 5 9
Debt securities, greater than 12 months, number of issues | Security 282 309
Debt securities, number of issues | Security 287 318
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 2,716 $ 2,943
Debt securities, greater than 12 months, fair value 87,312 97,405
Debt securities, fair value 90,028 100,348
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (9) (16)
Debt securities, greater than 12 months, unrealized losses (10,203) (13,291)
Debt securities, total unrealized losses $ (10,212) $ (13,307)
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 0 1
Debt securities, greater than 12 months, number of issues | Security 6 9
Debt securities, number of issues | Security 6 10
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 649
Debt securities, greater than 12 months, fair value 2,724 3,400
Debt securities, fair value 2,724 4,049
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (7)
Debt securities, greater than 12 months, unrealized losses (73) (154)
Debt securities, total unrealized losses $ (73) $ (161)
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 1 3
Debt securities, greater than 12 months, number of issues | Security 106 113
Debt securities, number of issues | Security 107 116
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 196 $ 1,193
Debt securities, greater than 12 months, fair value 17,963 19,096
Debt securities, fair value 18,159 20,289
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (3) (7)
Debt securities, greater than 12 months, unrealized losses (3,093) (3,803)
Debt securities, total unrealized losses $ (3,096) $ (3,810)
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 1 0
Debt securities, greater than 12 months, number of issues | Security 64 66
Debt securities, number of issues | Security 65 66
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 95 $ 0
Debt securities, greater than 12 months, fair value 31,092 30,495
Debt securities, fair value 31,187 30,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (5) 0
Debt securities, greater than 12 months, unrealized losses (2,494) (3,507)
Debt securities, total unrealized losses $ (2,499) $ (3,507)
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 3 1
Debt securities, greater than 12 months, number of issues | Security 7 21
Debt securities, number of issues | Security 10 22
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 2,425 $ 1,090
Debt securities, greater than 12 months, fair value 9,510 16,270
Debt securities, fair value 11,935 17,360
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1) (1)
Debt securities, greater than 12 months, unrealized losses (164) (583)
Debt securities, total unrealized losses $ (165) $ (584)
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 66 64
Debt securities, number of issues | Security 66 68
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 11
Debt securities, greater than 12 months, fair value 21,171 22,116
Debt securities, fair value 21,171 22,127
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (1)
Debt securities, greater than 12 months, unrealized losses (4,002) (4,640)
Debt securities, total unrealized losses $ (4,002) $ (4,641)
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 0
Debt securities, greater than 12 months, number of issues | Security 4 4
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 $ 0
Debt securities, greater than 12 months, fair value 2,218 3,225
Debt securities, fair value 2,218 3,225
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 0
Debt securities, greater than 12 months, unrealized losses (66) (160)
Debt securities, total unrealized losses $ (66) $ (160)
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 0 0
Debt securities, greater than 12 months, number of issues | Security 29 32
Debt securities, number of issues | Security 29 32
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 0
Debt securities, greater than 12 months, fair value 2,634 2,803
Debt securities, fair value 2,634 2,803
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 0
Debt securities, greater than 12 months, unrealized losses (311) (444)
Debt securities, total unrealized losses $ (311) $ (444)