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Investments - Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Number
Dec. 31, 2018
USD ($)
Number
Debt Securities, Available-for-sale [Line Items]    
No. of securities | Number 80 490
Fair value, Less than 12 months $ 31,995 $ 74,366
Unrealized losses, Less than 12 months (82) (536)
Fair value, 12 months or longer 26,553 221,001
Unrealized losses, 12 months or longer (306) (5,579)
Total, Fair value 58,548 295,367
Total, Unrealized losses $ (388) $ (6,115)
U.S. Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
No. of securities | Number 1
Fair value, Less than 12 months
Unrealized losses, Less than 12 months
Fair value, 12 months or longer 1,971
Unrealized losses, 12 months or longer (28)
Total, Fair value 1,971
Total, Unrealized losses $ (28)
U.S. Federal Agency Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
No. of securities | Number 6
Fair value, Less than 12 months $ 145
Unrealized losses, Less than 12 months (1)
Fair value, 12 months or longer 7,970
Unrealized losses, 12 months or longer (40)
Total, Fair value 8,115
Total, Unrealized losses $ (41)
Municipal Obligations, Tax Exempt [Member]    
Debt Securities, Available-for-sale [Line Items]    
No. of securities | Number 35 296
Fair value, Less than 12 months $ 8,105 $ 35,898
Unrealized losses, Less than 12 months (27) (367)
Fair value, 12 months or longer 5,625 85,921
Unrealized losses, 12 months or longer (53) (2,403)
Total, Fair value 13,730 121,819
Total, Unrealized losses $ (80) $ (2,770)
Municipal Obligations, Taxable [Member]    
Debt Securities, Available-for-sale [Line Items]    
No. of securities | Number 7 86
Fair value, Less than 12 months $ 8,293
Unrealized losses, Less than 12 months (22)
Fair value, 12 months or longer 1,551 28,984
Unrealized losses, 12 months or longer (2) (301)
Total, Fair value 1,551 37,277
Total, Unrealized losses $ (2) $ (323)
Agency Mortgage-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
No. of securities | Number 38 101
Fair value, Less than 12 months $ 23,890 $ 30,030
Unrealized losses, Less than 12 months (55) (146)
Fair value, 12 months or longer 19,377 96,155
Unrealized losses, 12 months or longer (251) (2,807)
Total, Fair value 43,267 126,185
Total, Unrealized losses $ (306) $ (2,953)