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Investments (Unrealized Losses) (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt security maturities rated investment grade, percent | 99.20% | 99.40%
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 | $ 569 | $ 1,203
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 16 | $ 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 2 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 315 | $ 65
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 13 | $ 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 4 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 884 | $ 1,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 29 | $ 48
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 6 | 7
US Government Agencies 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 |  | $ 221
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions |  | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position |  | $ 221
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions |  | 1
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 | $ 12,007 | $ 19,540
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 126 | $ 357
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 21 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 160,393 | $ 164,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 23,814 | $ 28,775
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 180 | 192
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 172,400 | $ 183,804
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 23,940 | $ 29,132
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 201 | 227
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 | $ 11,511 | $ 12,584
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 27 | $ 383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 8 | 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 165,303 | $ 176,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 24,150 | $ 30,872
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 194 | 217
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 176,814 | $ 189,105
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 24,177 | $ 31,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 202 | 236
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 | $ 8,889 | $ 10,175
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 122 | $ 265
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 14 | 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 173,308 | $ 176,725
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 32,604 | $ 36,829
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 216 | 223
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 182,197 | $ 186,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 32,726 | $ 37,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 230 | 239
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 | $ 2,805 | $ 3,596
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 132 | $ 66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 8 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 86,941 | $ 85,169
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 17,115 | $ 20,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 146 | 137
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 89,746 | $ 88,765
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 17,247 | $ 20,253
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 154 | 157
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 | $ 3,199 | $ 3,291
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 4 | $ 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 4 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 55,625 | $ 59,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 6,531 | $ 7,992
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 65 | 76
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 58,824 | $ 62,683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 6,535 | $ 8,049
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 69 | 77
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 | $ 2,749 | $ 5,784
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 34 | $ 153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 4 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 50,790 | $ 56,108
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 7,466 | $ 8,739
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 60 | 69
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 53,539 | $ 61,892
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7,500 | $ 8,892
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 64 | 74
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 | $ 10,989 | $ 2,080
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 97 | $ 32
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 18 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 71,434 | $ 85,757
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 10,578 | $ 12,407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 84 | 100
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 82,423 | $ 87,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 10,675 | $ 12,439
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 102 | 105
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 96 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 96 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1 |
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 | $ 46 | $ 849
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 3 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 98,714 | $ 95,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 7,633 | $ 10,022
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 84 | 86
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 98,760 | $ 96,655
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7,633 | $ 10,060
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 87 | 91
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 | $ 3,973 | $ 4,757
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 71 | $ 111
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 4 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 16,507 | $ 32,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 582 | $ 1,405
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 18 | 40
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 20,480 | $ 37,521
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 653 | $ 1,516
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 22 | 48
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 | $ 56,737 | $ 64,080
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 629 | $ 1,503
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 86 | 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 879,426 | $ 932,571
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 130,488 | $ 157,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1,052 | 1,142
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 936,163 | $ 996,651
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 131,117 | $ 158,739
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1,138 | 1,262

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