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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months, number of issues | security   110
Greater than 12 months, number of issues | security   59
Total Number of Issues | security   169
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 months, fair value   $ 53,517
Greater than 12 months, fair value   37,028
Total Fair Value   90,545
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, unrealized losses   (301)
Greater than 12 months, unrealized losses   (880)
Total Unrealized losses   $ (1,181)
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 29  
Debt securities, greater than 12 months, number of issues | security 5  
Debt securities, total number of issues | security 34  
Less than 12 months, number of issues | security   20
Greater than 12 months, number of issues | security   3
Total Number of Issues | security   23
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 18,228  
Debt securities, greater than 12 months, fair value 972  
Debt Securities, Available-for-sale, Unrealized Loss Position 19,200  
Less than 12 months, fair value   $ 13,948
Greater than 12 months, fair value   915
Total Fair Value   14,863
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (173)  
Debt securities, greater than 12 months, unrealized losses (14)  
Debt securities, total unrealized losses $ (187)  
Less than 12 months, unrealized losses   (29)
Greater than 12 months, unrealized losses   (6)
Total Unrealized losses   $ (35)
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 47  
Debt securities, greater than 12 months, number of issues | security 11  
Debt securities, total number of issues | security 58  
Less than 12 months, number of issues | security   38
Greater than 12 months, number of issues | security   10
Total Number of Issues | security   48
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 14,716  
Debt securities, greater than 12 months, fair value 7,118  
Debt Securities, Available-for-sale, Unrealized Loss Position 21,834  
Less than 12 months, fair value   $ 15,236
Greater than 12 months, fair value   6,555
Total Fair Value   21,791
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (247)  
Debt securities, greater than 12 months, unrealized losses (459)  
Debt securities, total unrealized losses $ (706)  
Less than 12 months, unrealized losses   (46)
Greater than 12 months, unrealized losses   (163)
Total Unrealized losses   $ (209)
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 40  
Debt securities, greater than 12 months, number of issues | security 9  
Debt securities, total number of issues | security 49  
Less than 12 months, number of issues | security   10
Greater than 12 months, number of issues | security   7
Total Number of Issues | security   17
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 9,239  
Debt securities, greater than 12 months, fair value 2,827  
Debt Securities, Available-for-sale, Unrealized Loss Position 12,066  
Less than 12 months, fair value   $ 3,511
Greater than 12 months, fair value   1,424
Total Fair Value   4,935
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (185)  
Debt securities, greater than 12 months, unrealized losses (120)  
Debt securities, total unrealized losses $ (305)  
Less than 12 months, unrealized losses   (20)
Greater than 12 months, unrealized losses   (34)
Total Unrealized losses   $ (54)
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 9  
Debt securities, greater than 12 months, number of issues | security 10  
Debt securities, total number of issues | security 19  
Less than 12 months, number of issues | security   12
Greater than 12 months, number of issues | security   7
Total Number of Issues | security   19
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 9,877  
Debt securities, greater than 12 months, fair value 5,300  
Debt Securities, Available-for-sale, Unrealized Loss Position 15,177  
Less than 12 months, fair value   $ 11,555
Greater than 12 months, fair value   2,207
Total Fair Value   13,762
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (165)  
Debt securities, greater than 12 months, unrealized losses (142)  
Debt securities, total unrealized losses $ (307)  
Less than 12 months, unrealized losses   (64)
Greater than 12 months, unrealized losses   (35)
Total Unrealized losses   $ (99)
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 19  
Debt securities, greater than 12 months, number of issues | security 28  
Debt securities, total number of issues | security 47  
Less than 12 months, number of issues | security   6
Greater than 12 months, number of issues | security   26
Total Number of Issues | security   32
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 6,664  
Debt securities, greater than 12 months, fair value 20,999  
Debt Securities, Available-for-sale, Unrealized Loss Position 27,663  
Less than 12 months, fair value   $ 4,935
Greater than 12 months, fair value   24,939
Total Fair Value   29,874
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (242)  
Debt securities, greater than 12 months, unrealized losses (1,282)  
Debt securities, total unrealized losses $ (1,524)  
Less than 12 months, unrealized losses   (19)
Greater than 12 months, unrealized losses   (503)
Total Unrealized losses   $ (522)
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 4  
Debt securities, greater than 12 months, number of issues | security 2  
Debt securities, total number of issues | security 6  
Less than 12 months, number of issues | security   3
Greater than 12 months, number of issues | security   2
Total Number of Issues | security   5
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 2,310  
Debt securities, greater than 12 months, fair value 1,400  
Debt Securities, Available-for-sale, Unrealized Loss Position 3,710  
Less than 12 months, fair value   $ 2,026
Greater than 12 months, fair value   722
Total Fair Value   2,748
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (26)  
Debt securities, greater than 12 months, unrealized losses (74)  
Debt securities, total unrealized losses $ (100)  
Less than 12 months, unrealized losses   (12)
Greater than 12 months, unrealized losses   (32)
Total Unrealized losses   $ (44)
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  
Debt securities, greater than 12 months, number of issues | security 3  
Debt securities, total number of issues | security 12  
Less than 12 months, number of issues | security   8
Greater than 12 months, number of issues | security   0
Total Number of Issues | security   8
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 275  
Debt securities, greater than 12 months, fair value 1,553  
Debt Securities, Available-for-sale, Unrealized Loss Position 1,828  
Less than 12 months, fair value   $ 1,870
Greater than 12 months, fair value   0
Total Fair Value   1,870
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (4)  
Debt securities, greater than 12 months, unrealized losses (71)  
Debt securities, total unrealized losses $ (75)  
Less than 12 months, unrealized losses   (36)
Greater than 12 months, unrealized losses   0
Total Unrealized losses   $ (36)
Equity securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months, number of issues | security   13
Greater than 12 months, number of issues | security   4
Total Number of Issues | security   17
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 months, fair value   $ 436
Greater than 12 months, fair value   266
Total Fair Value   702
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, unrealized losses   (75)
Greater than 12 months, unrealized losses   (107)
Total Unrealized losses   $ (182)
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 157  
Debt securities, greater than 12 months, number of issues | security 68  
Debt securities, total number of issues | security 225  
Less than 12 months, number of issues | security   97
Greater than 12 months, number of issues | security   55
Total Number of Issues | security   152
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 61,309  
Debt securities, greater than 12 months, fair value 40,169  
Debt Securities, Available-for-sale, Unrealized Loss Position 101,478  
Less than 12 months, fair value   $ 53,081
Greater than 12 months, fair value   36,762
Total Fair Value   89,843
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1,042)  
Debt securities, greater than 12 months, unrealized losses (2,162)  
Debt securities, total unrealized losses $ (3,204)  
Less than 12 months, unrealized losses   (226)
Greater than 12 months, unrealized losses   (773)
Total Unrealized losses   $ (999)