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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Jun. 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 7 9
Debt securities, greater than 12 months, number of issues | Security 295 309
Debt securities, number of issues | Security 302 318
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 2,654 $ 2,943
Debt securities, greater than 12 months, fair value 90,806 97,405
Debt securities, fair value 93,460 100,348
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (30) (16)
Debt securities, greater than 12 months, unrealized losses (13,614) (13,291)
Debt securities, total unrealized losses $ (13,644) $ (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 4 1
Debt securities, greater than 12 months, number of issues | Security 8 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 $ 1,769 $ 649
Debt securities, greater than 12 months, fair value 3,614 3,400
Debt securities, fair value 5,383 4,049
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (14) (7)
Debt securities, greater than 12 months, unrealized losses (141) (154)
Debt securities, total unrealized losses $ (155) $ (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 $ 193 $ 1,193
Debt securities, greater than 12 months, fair value 19,933 19,096
Debt securities, fair value 20,126 20,289
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (7) (7)
Debt securities, greater than 12 months, unrealized losses (3,839) (3,803)
Debt securities, total unrealized losses $ (3,846) $ (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 $ 92 $ 0
Debt securities, greater than 12 months, fair value 30,014 30,495
Debt securities, fair value 30,106 30,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (8) 0
Debt securities, greater than 12 months, unrealized losses (3,594) (3,507)
Debt securities, total unrealized losses $ (3,602) $ (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 1 1
Debt securities, greater than 12 months, number of issues | Security 8 21
Debt securities, number of issues | Security 9 22
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 600 $ 1,090
Debt securities, greater than 12 months, fair value 10,801 16,270
Debt securities, fair value 11,401 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 (346) (583)
Debt securities, total unrealized losses $ (347) $ (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 67 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 $ 0 $ 11
Debt securities, greater than 12 months, fair value 20,628 22,116
Debt securities, fair value 20,628 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 (5,162) (4,640)
Debt securities, total unrealized losses $ (5,162) $ (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 3,196 3,225
Debt securities, fair value 3,196 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 (105) (160)
Debt securities, total unrealized losses $ (105) $ (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 30 32
Debt securities, number of issues | Security 30 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 2,620 2,803
Debt securities, fair value 2,620 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 (427) (444)
Debt securities, total unrealized losses $ (427) $ (444)