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v3.23.3

Investments (Unrealized Losses) (Details) | 9 Months Ended |
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Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |
Debt security maturities rated investment grade, percent | 99.00% |  | 99.00%
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 | $ 1,210,000 |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 105,000 |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 5 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 65,000 |  | $ 64,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 9,000 |  | $ 9,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 2 |  | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,275,000 |  | $ 64,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 114,000 |  | $ 9,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 7 |  | 2
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 | $ 219,000 |  | $ 223,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 3,000 |  | $ 1,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 1 |  | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 0 |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 0 |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 219,000 |  | $ 223,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3,000 |  | $ 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1 |  | 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 | $ 66,573,000 |  | $ 189,084,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,405,000 |  | $ 30,866,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 94 |  | 242
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 157,245,000 |  | $ 14,184,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 40,560,000 |  | $ 7,098,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 198 |  | 14
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 223,818,000 |  | $ 203,268,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 42,965,000 |  | $ 37,964,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 292 |  | 256
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 | $ 35,347,000 |  | $ 182,447,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,343,000 |  | $ 39,122,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 53 |  | 237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 164,356,000 |  | $ 6,144,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 46,233,000 |  | $ 3,261,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 221 |  | 16
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 199,703,000 |  | $ 188,591,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 48,576,000 |  | $ 42,383,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 274 |  | 253
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 | $ 23,441,000 |  | $ 164,224,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,913,000 |  | $ 34,823,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 33 |  | 220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 160,871,000 |  | $ 23,417,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 52,889,000 |  | $ 12,315,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 222 |  | 30
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 184,312,000 |  | $ 187,641,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 54,802,000 |  | $ 47,138,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 255 |  | 250
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 | $ 14,964,000 |  | $ 73,483,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,173,000 |  | $ 15,959,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 54 |  | 152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 78,285,000 |  | $ 16,413,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 27,410,000 |  | $ 7,831,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 138 |  | 18
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 93,249,000 |  | $ 89,896,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 28,583,000 |  | $ 23,790,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 192 |  | 170
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 | $ 6,103,000 |  | $ 59,053,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 337,000 |  | $ 9,601,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 9 |  | 75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 57,011,000 |  | $ 5,617,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 12,967,000 |  | $ 1,794,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 79 |  | 8
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 63,114,000 |  | $ 64,670,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 13,304,000 |  | $ 11,395,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 88 |  | 83
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 | $ 16,510,000 |  | $ 140,955,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,091,000 |  | $ 25,337,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 25 |  | 171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 130,532,000 |  | $ 7,910,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 32,950,000 |  | $ 3,711,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 169 |  | 15
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 147,042,000 |  | $ 148,865,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 34,041,000 |  | $ 29,048,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 194 |  | 186
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 | $ 167,000 |  | $ 168,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 4,000 |  | $ 2,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 2 |  | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 0 |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 0 |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 167,000 |  | $ 168,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 4,000 |  | $ 2,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 2 |  | 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 | $ 1,159,000 |  | $ 98,758,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 92,000 |  | $ 10,514,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 20 |  | 95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 91,325,000 |  | $ 759,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 16,368,000 |  | $ 251,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 89 |  | 5
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 92,484,000 |  | $ 99,517,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 16,460,000 |  | $ 10,765,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 109 |  | 100
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 | $ 11,936,000 |  | $ 37,067,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 666,000 |  | $ 2,485,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 17 |  | 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 32,756,000 |  | $ 4,264,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,840,000 |  | $ 282,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 40 |  | 9
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 44,692,000 |  | $ 41,331,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,506,000 |  | $ 2,767,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 57 |  | 50
Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | $ 0 | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 177,629,000 |  | $ 945,462,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 10,132,000 |  | $ 168,710,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 313 |  | 1,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 872,446,000 |  | $ 78,772,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 231,226,000 |  | $ 36,552,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1,158 |  | 117
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,050,075,000 |  | $ 1,024,234,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 241,358,000 |  | $ 205,262,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1,471 |  | 1,353

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