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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Jun. 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 86 32
Debt securities, greater than 12 months, number of issues | security 6 11
Debt securities, number of issues | security 92 43
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 74,581 $ 20,516
Debt securities, greater than 12 months, fair value 3,957 6,551
Debt securities, fair value 78,538 27,067
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (920) (112)
Debt securities, greater than 12 months, unrealized losses (4) (39)
Debt securities, total unrealized losses $ (924) $ (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 $ 10,610 $ 6,764
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 10,610 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 35 16
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 35 16
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 6,081 $ 3,905
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 6,081 3,905
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (74) (28)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (74) $ (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 17 2
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 17 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 10,853 $ 1,051
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 10,853 1,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (208) (23)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (208) $ (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 13 7
Debt securities, greater than 12 months, number of issues | security 5 11
Debt securities, number of issues | security 18 18
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 16,064 $ 6,050
Debt securities, greater than 12 months, fair value 3,906 6,551
Debt securities, fair value 19,970 12,601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (89) (34)
Debt securities, greater than 12 months, unrealized losses (3) (39)
Debt securities, total unrealized losses $ (92) $ (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 8 2
Debt securities, greater than 12 months, number of issues | security 0 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 $ 28,500 $ 1,652
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 28,500 1,652
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (499) (3)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (499) $ (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 8 2
Debt securities, greater than 12 months, number of issues | security 1 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 $ 2,473 $ 195
Debt securities, greater than 12 months, fair value 51 0
Debt securities, fair value 2,524 195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (23) (1)
Debt securities, greater than 12 months, unrealized losses (1) 0
Debt securities, total unrealized losses $ (24) $ (1)