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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 35  
Debt securities, greater than 12 months, number of issues | security 116  
Debt securities, number of issues | security 151  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 14,314  
Debt securities, greater than 12 months, fair value 66,921  
Debt securities, fair value 81,235  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (105)  
Debt securities, greater than 12 months, unrealized losses (1,228)  
Debt securities, total unrealized losses $ (1,333)  
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 18 25
Debt securities, greater than 12 months, number of issues | security 10 9
Debt securities, number of issues | security 28 34
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 12,388 $ 17,743
Debt securities, greater than 12 months, fair value 5,020 4,166
Debt securities, fair value 17,408 21,909
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (99) (148)
Debt securities, greater than 12 months, unrealized losses (53) (60)
Debt securities, total unrealized losses $ (152) $ (208)
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 36
Debt securities, greater than 12 months, number of issues | security 32 25
Debt securities, number of issues | security 33 61
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 1,049 $ 12,096
Debt securities, greater than 12 months, fair value 13,952 11,993
Debt securities, fair value 15,001 24,089
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (2) (140)
Debt securities, greater than 12 months, unrealized losses (211) (511)
Debt securities, total unrealized losses $ (213) $ (651)
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 21
Debt securities, greater than 12 months, number of issues | security 13 16
Debt securities, number of issues | security 14 37
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 249 $ 4,935
Debt securities, greater than 12 months, fair value 3,484 4,273
Debt securities, fair value 3,733 9,208
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (40)
Debt securities, greater than 12 months, unrealized losses (31) (134)
Debt securities, total unrealized losses $ (31) $ (174)
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 1
Debt securities, greater than 12 months, number of issues | security 17 16
Debt securities, number of issues | security 17 17
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 0 $ 2,470
Debt securities, greater than 12 months, fair value 14,147 11,725
Debt securities, fair value 14,147 14,195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (24)
Debt securities, greater than 12 months, unrealized losses (103) (154)
Debt securities, total unrealized losses $ (103) $ (178)
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 20
Debt securities, greater than 12 months, number of issues | security 35 30
Debt securities, number of issues | security 43 50
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 292 $ 5,474
Debt securities, greater than 12 months, fair value 25,672 21,715
Debt securities, fair value 25,964 27,189
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (3) (138)
Debt securities, greater than 12 months, unrealized losses (767) (1,017)
Debt securities, total unrealized losses $ (770) $ (1,155)
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 2 4
Debt securities, greater than 12 months, number of issues | security 4 3
Debt securities, number of issues | security 6 7
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 180 $ 1,082
Debt securities, greater than 12 months, fair value 3,103 2,632
Debt securities, fair value 3,283 3,714
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses 0 (12)
Debt securities, greater than 12 months, unrealized losses (40) (65)
Debt securities, total unrealized losses $ (40) $ (77)
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 5 4
Debt securities, greater than 12 months, number of issues | security 5 6
Debt securities, number of issues | security 10 10
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 156 $ 116
Debt securities, greater than 12 months, fair value 1,543 1,587
Debt securities, fair value 1,699 1,703
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 (23) (42)
Debt securities, total unrealized losses $ (24) $ (43)
Total debt securities available for sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security   111
Debt securities, greater than 12 months, number of issues | security   105
Debt securities, number of issues | security   216
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value   $ 43,916
Debt securities, greater than 12 months, fair value   58,091
Debt securities, fair value   102,007
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses   (503)
Debt securities, greater than 12 months, unrealized losses   (1,983)
Debt securities, total unrealized losses   $ (2,486)