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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES - Cumulative Paid Claims and Allocated Claim Adjustment Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance | $ 1,612,566 |  |  |  |  |  |  |  |  |
Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 1,133,333 |  |  |  |  |  |  |  |  |
All outstanding liabilities for unpaid losses and loss settlement expenses before 2016, net of reinsurance | 15,406 |  |  |  |  |  |  |  |  |
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance | 811,208 |  |  |  |  |  |  |  |  |
Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 1,384,872 |  |  |  |  |  |  |  |  |
All outstanding liabilities for unpaid losses and loss settlement expenses before 2016, net of reinsurance | 890 |  |  |  |  |  |  |  |  |
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance | 130,890 |  |  |  |  |  |  |  |  |
Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 1,647,507 |  |  |  |  |  |  |  |  |
All outstanding liabilities for unpaid losses and loss settlement expenses before 2016, net of reinsurance | 628 |  |  |  |  |  |  |  |  |
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance | 256,254 |  |  |  |  |  |  |  |  |
Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 359,380 |  |  |  |  |  |  |  |  |
All outstanding liabilities for unpaid losses and loss settlement expenses before 2016, net of reinsurance | 15,289 |  |  |  |  |  |  |  |  |
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance | 74,006 |  |  |  |  |  |  |  |  |
Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 322,951 |  |  |  |  |  |  |  |  |
All outstanding liabilities for unpaid losses and loss settlement expenses before 2016, net of reinsurance | 234 |  |  |  |  |  |  |  |  |
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance | 9,866 |  |  |  |  |  |  |  |  |
2016 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 157,582 | $ 141,445 | $ 136,400 | $ 126,561 | $ 115,107 | $ 102,757 | $ 88,885 | $ 63,526 | $ 38,184 | $ 13,782
2016 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 142,044 | 142,038 | 141,008 | 142,248 | 141,104 | 139,353 | 137,907 | 132,429 | 125,962 | 92,895
2016 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 173,673 | 173,661 | 172,928 | 171,380 | 168,950 | 164,341 | 148,224 | 128,156 | 103,528 | 66,013
2016 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 51,344 | 51,126 | 51,023 | 50,127 | 48,277 | 47,082 | 45,743 | 40,680 | 32,345 | 14,413
2016 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 45,160 | 45,159 | 44,827 | 44,828 | 44,737 | 44,618 | 44,046 | 42,660 | 40,910 | $ 32,999
2017 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 159,008 | 148,295 | 138,127 | 128,430 | 111,085 | 91,984 | 70,500 | 43,172 | 17,716 |
2017 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 160,543 | 160,487 | 159,456 | 159,286 | 157,512 | 152,219 | 145,900 | 137,058 | 99,484 |
2017 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 229,444 | 228,129 | 228,749 | 223,076 | 212,947 | 197,893 | 166,170 | 126,644 | 81,311 |
2017 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 46,202 | 46,154 | 45,742 | 45,508 | 43,833 | 41,672 | 38,082 | 31,309 | 14,647 |
2017 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 58,597 | 58,597 | 58,377 | 58,206 | 57,824 | 57,169 | 55,982 | 53,111 | $ 42,135 |
2018 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 191,737 | 179,469 | 158,851 | 130,942 | 105,515 | 79,168 | 44,772 | 16,200 |  |
2018 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 146,015 | 145,954 | 145,021 | 141,841 | 137,794 | 133,703 | 123,559 | 92,770 |  |
2018 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 250,815 | 249,009 | 244,284 | 235,519 | 211,123 | 187,405 | 138,092 | 81,572 |  |
2018 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 50,381 | 50,031 | 49,964 | 48,807 | 47,173 | 43,189 | 35,369 | 16,949 |  |
2018 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 51,103 | 51,101 | 50,852 | 50,661 | 50,185 | 49,464 | 47,433 | $ 37,410 |  |
2019 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 159,813 | 138,236 | 127,650 | 102,510 | 72,179 | 46,986 | 18,221 |  |  |
2019 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 154,217 | 153,893 | 151,739 | 150,196 | 142,342 | 136,084 | 100,980 |  |  |
2019 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 270,603 | 268,355 | 264,151 | 246,801 | 205,614 | 153,244 | 91,919 |  |  |
2019 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 48,263 | 47,308 | 46,101 | 43,044 | 38,382 | 29,668 | 13,582 |  |  |
2019 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 57,510 | 56,971 | 56,852 | 56,658 | 54,935 | 52,390 | $ 40,544 |  |  |
2020 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 130,020 | 110,931 | 98,592 | 60,114 | 43,596 | 17,011 |  |  |  |
2020 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 207,336 | 205,357 | 197,602 | 192,902 | 173,055 | 128,704 |  |  |  |
2020 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 181,079 | 174,175 | 161,798 | 138,158 | 109,686 | 67,660 |  |  |  |
2020 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 42,992 | 42,052 | 39,479 | 35,542 | 29,605 | 17,603 |  |  |  |
2020 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 71,385 | 71,394 | 71,416 | 70,543 | 68,124 | $ 54,181 |  |  |  |
2021 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 111,221 | 90,607 | 59,278 | 33,642 | 12,434 |  |  |  |  |
2021 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 169,172 | 161,705 | 154,242 | 140,406 | 97,451 |  |  |  |  |
2021 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 160,062 | 146,436 | 128,283 | 99,116 | 64,381 |  |  |  |  |
2021 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 37,598 | 36,512 | 34,074 | 29,453 | 17,949 |  |  |  |  |
2021 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 25,822 | 25,764 | 24,889 | 23,829 | $ 20,298 |  |  |  |  |
2022 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 112,472 | 69,896 | 42,168 | 10,468 |  |  |  |  |  |
2022 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 158,616 | 150,710 | 138,479 | 96,160 |  |  |  |  |  |
2022 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 139,429 | 124,853 | 95,785 | 62,477 |  |  |  |  |  |
2022 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 23,585 | 21,033 | 17,851 | 9,434 |  |  |  |  |  |
2022 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 2,828 | 2,792 | 2,128 | $ 551 |  |  |  |  |  |
2023 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 70,767 | 41,847 | 9,335 |  |  |  |  |  |  |
2023 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 119,537 | 106,083 | 75,304 |  |  |  |  |  |  |
2023 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 110,254 | 85,483 | 56,175 |  |  |  |  |  |  |
2023 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 21,458 | 18,085 | 10,227 |  |  |  |  |  |  |
2023 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 4,598 | 3,089 | $ 297 |  |  |  |  |  |  |
2024 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 30,442 | 10,732 |  |  |  |  |  |  |  |
2024 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 74,052 | 58,228 |  |  |  |  |  |  |  |
2024 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 81,488 | 51,283 |  |  |  |  |  |  |  |
2024 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 21,504 | 10,277 |  |  |  |  |  |  |  |
2024 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 2,672 | $ 617 |  |  |  |  |  |  |  |
2025 | Commercial other liability |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 10,271 |  |  |  |  |  |  |  |  |
2025 | Commercial fire and allied |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 53,340 |  |  |  |  |  |  |  |  |
2025 | Commercial automobile |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 50,660 |  |  |  |  |  |  |  |  |
2025 | Commercial workers' compensation |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | 16,053 |  |  |  |  |  |  |  |  |
2025 | Personal |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance | $ 3,276 |  |  |  |  |  |  |  |  |

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