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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 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 12 9
Debt securities, greater than 12 months, number of issues | Security 300 309
Debt securities, number of issues | Security 312 318
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 5,696 $ 2,943
Debt securities, greater than 12 months, fair value 91,878 97,405
Debt securities, fair value 97,574 100,348
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (33) (16)
Debt securities, greater than 12 months, unrealized losses (13,727) (13,291)
Debt securities, total unrealized losses $ (13,760) $ (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 3 1
Debt securities, greater than 12 months, number of issues | Security 9 9
Debt securities, number of issues | Security 12 10
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,938 $ 649
Debt securities, greater than 12 months, fair value 3,407 3,400
Debt securities, fair value 5,345 4,049
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (27) (7)
Debt securities, greater than 12 months, unrealized losses (145) (154)
Debt securities, total unrealized losses $ (172) $ (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 114 113
Debt securities, number of issues | Security 115 116
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 300 $ 1,193
Debt securities, greater than 12 months, fair value 19,862 19,096
Debt securities, fair value 20,162 20,289
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1) (7)
Debt securities, greater than 12 months, unrealized losses (3,798) (3,803)
Debt securities, total unrealized losses $ (3,799) $ (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 0 0
Debt securities, greater than 12 months, number of issues | Security 65 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 $ 0 $ 0
Debt securities, greater than 12 months, fair value 30,213 30,495
Debt securities, fair value 30,213 30,495
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 (3,667) (3,507)
Debt securities, total unrealized losses $ (3,667) $ (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 7 1
Debt securities, greater than 12 months, number of issues | Security 11 21
Debt securities, number of issues | Security 18 22
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 3,453 $ 1,090
Debt securities, greater than 12 months, fair value 11,175 16,270
Debt securities, fair value 14,628 17,360
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (4) (1)
Debt securities, greater than 12 months, unrealized losses (481) (583)
Debt securities, total unrealized losses $ (485) $ (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 1 4
Debt securities, greater than 12 months, number of issues | Security 66 64
Debt securities, number of issues | Security 67 68
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 5 $ 11
Debt securities, greater than 12 months, fair value 21,271 22,116
Debt securities, fair value 21,276 22,127
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 (5,043) (4,640)
Debt securities, total unrealized losses $ (5,044) $ (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 3,240 3,225
Debt securities, fair value 3,240 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 (142) (160)
Debt securities, total unrealized losses $ (142) $ (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 31 32
Debt securities, number of issues | Security 31 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 2,710 2,803
Debt securities, fair value 2,710 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 (451) (444)
Debt securities, total unrealized losses $ (451) $ (444)