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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 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 120 32
Debt securities, greater than 12 months, number of issues | security 9 11
Debt securities, number of issues | security 129 43
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 81,578 $ 20,516
Debt securities, greater than 12 months, fair value 5,547 6,551
Debt securities, fair value 87,125 27,067
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (2,047) (112)
Debt securities, greater than 12 months, unrealized losses (37) (39)
Debt securities, total unrealized losses $ (2,084) $ (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 $ 7,664 $ 6,764
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 7,664 6,764
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (27) (1)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (27) $ (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 70 16
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 70 16
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 14,758 $ 3,905
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 14,758 3,905
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (601) (28)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (601) $ (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 13 2
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 13 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 9,144 $ 1,051
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 9,144 1,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (410) (23)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (410) $ (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 14 7
Debt securities, greater than 12 months, number of issues | security 7 11
Debt securities, number of issues | security 21 18
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 17,644 $ 6,050
Debt securities, greater than 12 months, fair value 4,578 6,551
Debt securities, fair value 22,222 12,601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (114) (34)
Debt securities, greater than 12 months, unrealized losses (4) (39)
Debt securities, total unrealized losses $ (118) $ (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 $ 28,941 $ 1,652
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 28,941 1,652
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (861) (3)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (861) $ (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 1 0
Debt securities, number of issues | security 1 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 888 0
Debt securities, fair value 888 899
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 (32) 0
Debt securities, total unrealized losses $ (32) $ (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 9 2
Debt securities, greater than 12 months, number of issues | security 1 0
Debt securities, number of issues | security 10 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 3,427 $ 195
Debt securities, greater than 12 months, fair value 81 0
Debt securities, fair value 3,508 195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (34) (1)
Debt securities, greater than 12 months, unrealized losses (1) 0
Debt securities, total unrealized losses $ (35) $ (1)