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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($) | 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 | Dec. 31, 2015
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Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 65,645,000 | $ 74,003,000 |  |  |  |  |  |  |  |
Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 65,645,000 | 74,003,000 |  |  |  |  |  |  |  |
Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 538,916,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 65,645,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 473,273,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 2,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 28,434,000 | 28,678,000 | $ 28,680,000 | $ 28,350,000 | $ 26,910,000 | $ 26,332,000 | $ 26,614,000 | $ 24,563,000 | $ 20,379,000 | $ 16,504,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 823 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 28,433,000 | 28,057,000 | 28,024,000 | 27,303,000 | 25,269,000 | 23,605,000 | 22,978,000 | 20,640,000 | 17,134,000 | $ 10,188,000
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 40,371,000 | 40,369,000 | 54,960,000 | 40,379,000 | 39,831,000 | 40,250,000 | 39,012,000 | 41,477,000 | 54,343,000 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 349,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 999 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 40,021,000 | 40,017,000 | 54,497,000 | 39,940,000 | 38,700,000 | 37,844,000 | 35,548,000 | 32,651,000 | $ 25,567,000 |
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 78,782,000 | 80,536,000 | 91,545,000 | 87,833,000 | 83,286,000 | 78,970,000 | 72,135,000 | 70,650,000 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 12,756,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 2,627 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 61,771,000 | 54,143,000 | 84,933,000 | 80,460,000 | 73,683,000 | 64,329,000 | 62,353,000 | $ 40,467,000 |  |
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 67,908,000 | 67,238,000 | 84,727,000 | 68,384,000 | 69,203,000 | 64,964,000 | 61,778,000 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ (834,000) |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 2,842 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 68,496,000 | 67,193,000 | 82,443,000 | 66,848,000 | 61,885,000 | 54,551,000 | $ 27,852,000 |  |  |
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 70,596,000 | 70,611,000 | 41,424,000 | 68,900,000 | 70,515,000 | 76,515,000 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 1,905,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 3,859 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 64,817,000 | 64,274,000 | 34,768,000 | 62,133,000 | 57,041,000 | $ 38,428,000 |  |  |  |
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 88,589,000 | 85,036,000 | 75,844,000 | 77,831,000 | 77,482,000 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ (679,000) |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 5,094 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 87,433,000 | 84,525,000 | 79,570,000 | 56,201,000 | $ 33,532,000 |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 31,737,000 | 29,991,000 | 38,304,000 | 53,338,000 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 1,008,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 4,226 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 35,492,000 | 32,033,000 | 28,506,000 | $ 19,754,000 |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 77,959,000 | 77,097,000 | 74,158,000 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 10,442,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 2,390 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 64,360,000 | 51,748,000 | $ 16,645,000 |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 20,813,000 | 25,430,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 6,867,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 413 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 13,557,000 | $ 8,993,000 |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2021 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 33,727,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 18,572,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 415 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 8,893,000 |  |  |  |  |  |  |  |  |

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