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Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2023 USD ($) Securities | Dec. 31, 2022 USD ($) Securities
--- | --- | ---
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | $ 30,134 | $ 159,874
12 months or longer | 168,738 | 33,773
Total | 198,872 | 193,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 859 | 20,326
12 months or longer | 26,457 | 8,464
Total | $ 27,316 | $ 28,790
Number of securities in unrealized loss position | Securities | 248 | 237
Allowance for expected credit losses on available-for-sale fixed maturities | $ 0 | $ 0
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 | 11,404 | 23,763
12 months or longer | 36,608 | 19,259
Total | 48,012 | 43,022
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 287 | 2,410
12 months or longer | 5,661 | 3,516
Total | 5,948 | 5,926
Allowance for expected credit losses on available-for-sale fixed maturities | 0 |
Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 2,143 | 8,183
12 months or longer | 6,005 | 0
Total | 8,148 | 8,183
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 18 | 1,702
12 months or longer | 1,352 | 0
Total | 1,370 | 1,702
Allowance for expected credit losses on available-for-sale fixed maturities | 0 |
Corporate Securities [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 16,587 | 127,928
12 months or longer | 126,125 | 14,514
Total | 142,712 | 142,442
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 554 | 16,214
12 months or longer | 19,444 | 4,948
Total | 19,998 | $ 21,162
Allowance for expected credit losses on available-for-sale fixed maturities | $ 0 |

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