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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 103 32
Debt securities, greater than 12 months, number of issues | security 9 11
Debt securities, number of issues | security 112 43
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 76,068 $ 20,516
Debt securities, greater than 12 months, fair value 3,352 6,551
Debt securities, fair value 79,420 27,067
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1,202) (112)
Debt securities, greater than 12 months, unrealized losses (61) (39)
Debt securities, total unrealized losses $ (1,263) $ (151)
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 5 2
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 5 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 7,659 $ 6,764
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 7,659 6,764
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (26) (1)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (26) $ (1)
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 44 16
Debt securities, greater than 12 months, number of issues | security 3 0
Debt securities, number of issues | security 47 16
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 8,447 $ 3,905
Debt securities, greater than 12 months, fair value 349 0
Debt securities, fair value 8,796 3,905
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (147) (28)
Debt securities, greater than 12 months, unrealized losses (14) 0
Debt securities, total unrealized losses $ (161) $ (28)
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 27 2
Debt securities, greater than 12 months, number of issues | security 1 0
Debt securities, number of issues | security 28 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 15,978 $ 1,051
Debt securities, greater than 12 months, fair value 707 0
Debt securities, fair value 16,685 1,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (266) (23)
Debt securities, greater than 12 months, unrealized losses (43) 0
Debt securities, total unrealized losses $ (309) $ (23)
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 12 7
Debt securities, greater than 12 months, number of issues | security 3 11
Debt securities, number of issues | security 15 18
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 14,644 $ 6,050
Debt securities, greater than 12 months, fair value 2,249 6,551
Debt securities, fair value 16,893 12,601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (88) (34)
Debt securities, greater than 12 months, unrealized losses (3) (39)
Debt securities, total unrealized losses $ (91) $ (73)
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 9 2
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 9 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 27,195 $ 1,652
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 27,195 1,652
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (650) (3)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (650) $ (3)
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 1
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 0 1
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 899
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 0 899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (22)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ 0 $ (22)
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 6 2
Debt securities, greater than 12 months, number of issues | security 2 0
Debt securities, number of issues | security 8 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 2,145 $ 195
Debt securities, greater than 12 months, fair value 47 0
Debt securities, fair value 2,192 195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (25) (1)
Debt securities, greater than 12 months, unrealized losses (1) 0
Debt securities, total unrealized losses $ (26) $ (1)