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Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) Securities | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Securities | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | $ 23,811 |  | $ 23,811 |  | $ 49,633
12 months or longer | 15,119 |  | 15,119 |  | 125,778
Total | 38,930 |  | 38,930 |  | 175,411
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 65 |  | 65 |  | 1,592
12 months or longer | 308 |  | 308 |  | 10,259
Total | 373 |  | 373 |  | $ 11,851
Gross OTTI losses charged to realized gains | $ 0 | $ 0 | $ 0 | $ 0 |
Number of securities in unrealized loss position | Securities | 24 |  | 24 |  | 140
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | $ 1,020 |  | $ 1,020 |  | $ 0
12 months or longer | 7,689 |  | 7,689 |  | 24,786
Total | 8,709 |  | 8,709 |  | 24,786
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 4 |  | 4 |  | 0
12 months or longer | 118 |  | 118 |  | 1,061
Total | 122 |  | 122 |  | 1,061
Obligations of States and Political Subdivisions [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months |  |  |  |  | 0
12 months or longer |  |  |  |  | 3,980
Total |  |  |  |  | 3,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months |  |  |  |  | 0
12 months or longer |  |  |  |  | 72
Total |  |  |  |  | 72
Corporate Securities [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 22,791 |  | 22,791 |  | 49,633
12 months or longer | 7,430 |  | 7,430 |  | 97,012
Total | 30,221 |  | 30,221 |  | 146,645
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 61 |  | 61 |  | 1,592
12 months or longer | 190 |  | 190 |  | 9,126
Total | $ 251 |  | $ 251 |  | $ 10,718

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