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Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Securities | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Securities | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | $ 23,399 |  | $ 23,399 |  | $ 29,783
12 months or longer | 0 |  | 0 |  | 6,037
Total | 23,399 |  | 23,399 |  | 35,820
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 1,506 |  | 1,506 |  | 220
12 months or longer | 0 |  | 0 |  | 127
Total | 1,506 |  | 1,506 |  | $ 347
Gross OTTI losses charged to realized gains | $ 0 | $ 0 | $ 0 | $ 0 |
Number of securities in unrealized loss position | Securities | 17 |  | 17 |  | 30
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 | $ 887 |  | $ 887 |  | $ 3,432
12 months or longer | 0 |  | 0 |  | 3,533
Total | 887 |  | 887 |  | 6,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 25 |  | 25 |  | 22
12 months or longer | 0 |  | 0 |  | 31
Total | 25 |  | 25 |  | 53
Obligations of States and Political Subdivisions [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months |  |  |  |  | 3,106
12 months or longer |  |  |  |  | 0
Total |  |  |  |  | 3,106
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months |  |  |  |  | 53
12 months or longer |  |  |  |  | 0
Total |  |  |  |  | 53
Corporate Securities [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 22,512 |  | 22,512 |  | 23,245
12 months or longer | 0 |  | 0 |  | 2,504
Total | 22,512 |  | 22,512 |  | 25,749
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 1,481 |  | 1,481 |  | 145
12 months or longer | 0 |  | 0 |  | 96
Total | $ 1,481 |  | $ 1,481 |  | $ 241

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