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Investments (Unrealized Losses) (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt security maturities rated investment grade, percent | 98.60% | 99.20%
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 850 | $ 835
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 38 | $ 51
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 3 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 437 | $ 435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 63 | $ 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 5 | 5
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,287 | $ 1,270
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 101 | $ 115
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 8 | 8
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 27,435 | $ 42,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 959 | $ 1,484
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 43 | 63
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 149,245 | $ 147,534
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 30,139 | $ 32,058
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 178 | 177
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 176,680 | $ 190,117
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 31,098 | $ 33,542
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 221 | 240
Corporate Debt Securities Financial Sector Member [Domain] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 18,395 | $ 29,258
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 376 | $ 756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 22 | 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 150,166 | $ 154,448
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 29,130 | $ 32,529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 188 | 192
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 168,561 | $ 183,706
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 29,506 | $ 33,285
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 210 | 245
Corporate Debt Security Consumer Sector |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 34,176 | $ 37,231
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,626 | $ 2,053
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 40 | 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 156,503 | $ 161,795
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 41,306 | $ 43,902
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 213 | 216
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 190,679 | $ 199,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 42,932 | $ 45,955
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 253 | 273
Corporate Debt Security Utilities Sector |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 12,326 | $ 16,750
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 469 | $ 687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 35 | 47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 80,571 | $ 79,488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 21,010 | $ 22,083
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 144 | 142
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 92,897 | $ 96,238
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 21,479 | $ 22,770
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 179 | 189
Corporate Debt Security Energy Sector |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 11,520 | $ 11,654
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 357 | $ 438
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 27 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 51,619 | $ 52,537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 8,784 | $ 9,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 62 | 65
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 63,139 | $ 64,191
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 9,141 | $ 9,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 89 | 94
Corporate Debt Security Communications Sector |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,995 | $ 9,973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 98 | $ 250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 6 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 45,995 | $ 48,462
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 8,390 | $ 9,660
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 58 | 60
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 48,990 | $ 58,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 8,488 | $ 9,910
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 64 | 71
Corporate Debt Security All Other Sector |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 19,993 | $ 25,208
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 661 | $ 1,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 34 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 70,856 | $ 68,756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 16,290 | $ 15,131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 89 | 87
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 90,849 | $ 93,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 16,951 | $ 16,368
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 123 | 125
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 0 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 86 | $ 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3 | $ 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1 | 1
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 86 | $ 189
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3 | $ 5
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1 | 2
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 58 | $ 160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1 | $ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 2 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 95,514 | $ 93,231
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 9,786 | $ 13,024
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 83 | 84
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 95,572 | $ 93,391
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 9,787 | $ 13,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 85 | 95
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 6,519 | $ 10,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 270 | $ 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 10 | 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 14,338 | $ 14,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 486 | $ 563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 15 | 16
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 20,857 | $ 25,071
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 756 | $ 806
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 25 | 30
Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 134,267 | $ 184,082
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 4,855 | $ 7,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 222 | 327
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 815,330 | $ 821,516
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 165,387 | $ 178,540
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1,036 | 1,045
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 949,597 | $ 1,005,598
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 170,242 | $ 185,741
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1,258 | 1,372

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