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Investments (Unrealized Losses) (Details) $ in Thousands | Sep. 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 | 99.00% | 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 | $ 470 | $ 835
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2 | $ 51
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 2 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 828 | $ 435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 90 | $ 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 6 | 5
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,298 | $ 1,270
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 92 | $ 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 | $ 21,630 | $ 42,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 382 | $ 1,484
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 25 | 63
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 149,134 | $ 147,534
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 27,372 | $ 32,058
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 181 | 177
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 170,764 | $ 190,117
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 27,754 | $ 33,542
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 206 | 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 | $ 17,197 | $ 29,258
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 231 | $ 756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 33 | 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 147,423 | $ 154,448
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 25,744 | $ 32,529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 178 | 192
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 164,620 | $ 183,706
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 25,975 | $ 33,285
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 211 | 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 | $ 25,206 | $ 37,231
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 709 | $ 2,053
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 31 | 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 159,917 | $ 161,795
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 37,700 | $ 43,902
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 218 | 216
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 185,123 | $ 199,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 38,409 | $ 45,955
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 249 | 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 | $ 12,308 | $ 16,750
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 178 | $ 687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 34 | 47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 79,033 | $ 79,488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 19,199 | $ 22,083
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 140 | 142
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 91,341 | $ 96,238
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 19,377 | $ 22,770
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 174 | 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 | $ 13,304 | $ 11,654
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 160 | $ 438
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 29 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 45,449 | $ 52,537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 7,270 | $ 9,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 53 | 65
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 58,753 | $ 64,191
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7,430 | $ 9,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 82 | 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 | $ 6,269 | $ 9,973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 49 | $ 250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 10 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 41,961 | $ 48,462
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 7,411 | $ 9,660
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 50 | 60
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 48,230 | $ 58,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7,460 | $ 9,910
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 60 | 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 | $ 7,481 | $ 25,208
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 207 | $ 1,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 17 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 73,067 | $ 68,756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 15,007 | $ 15,131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 95 | 87
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 80,548 | $ 93,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 15,214 | $ 16,368
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 112 | 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 | $ 85 | $ 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 2 | $ 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 | $ 85 | $ 189
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2 | $ 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 | $ 1,574 | $ 160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2 | $ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 7 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 94,084 | $ 93,231
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 8,371 | $ 13,024
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 79 | 84
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 95,658 | $ 93,391
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 8,373 | $ 13,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 86 | 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 | $ 4,728 | $ 10,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 175 | $ 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 7 | 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 9,768 | $ 14,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 358 | $ 563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 11 | 16
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 14,496 | $ 25,071
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 533 | $ 806
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 18 | 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 | $ 110,167 | $ 184,082
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,095 | $ 7,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 195 | 327
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 800,749 | $ 821,516
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 148,524 | $ 178,540
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1,012 | 1,045
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 910,916 | $ 1,005,598
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 150,619 | $ 185,741
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1,207 | 1,372

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