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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 17 27
Debt securities, greater than 12 months, number of issues | security 13 38
Debt securities, number of issues | security 30 65
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 10,451 $ 15,949
Debt securities, greater than 12 months, fair value 7,140 22,392
Debt securities, fair value 17,591 38,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (359) (78)
Debt securities, greater than 12 months, unrealized losses (192) (175)
Debt securities, total unrealized losses $ (551) $ (253)
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 0 0
Debt securities, greater than 12 months, number of issues | security 0 4
Debt securities, number of issues | security 0 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 0 1,047
Debt securities, fair value 0 1,047
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 0 (6)
Debt securities, total unrealized losses $ 0 $ (6)
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 0
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 1 0
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 175 $ 0
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 175 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1) 0
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (1) $ 0
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 3 7
Debt securities, greater than 12 months, number of issues | security 0 3
Debt securities, number of issues | security 3 10
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,677 $ 3,720
Debt securities, greater than 12 months, fair value 0 1,697
Debt securities, fair value 1,677 5,417
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (147) (17)
Debt securities, greater than 12 months, unrealized losses 0 (4)
Debt securities, total unrealized losses $ (147) $ (21)
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 9 3
Debt securities, greater than 12 months, number of issues | security 13 18
Debt securities, number of issues | security 22 21
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 6,626 $ 2,596
Debt securities, greater than 12 months, fair value 7,140 11,836
Debt securities, fair value 13,766 14,432
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (118) (1)
Debt securities, greater than 12 months, unrealized losses (192) (54)
Debt securities, total unrealized losses $ (310) $ (55)
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 3
Debt securities, greater than 12 months, number of issues | security 0 13
Debt securities, number of issues | security 0 16
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 715
Debt securities, greater than 12 months, fair value 0 7,812
Debt securities, fair value 0 8,527
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 0 (111)
Debt securities, total unrealized losses $ 0 $ (112)
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 1 6
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 1 6
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 843 $ 6,837
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 843 6,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (81) (45)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (81) $ (45)
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 3 8
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 3 8
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,130 $ 2,081
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 1,130 2,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (12) (14)
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (12) $ (14)