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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($) | 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 | Dec. 31, 2014
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Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 95,625,000 | $ 105,196,000 |  |  |  |  |  |  |  |
Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 485,593,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 74,003,000 | 80,256,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 411,590,000 |  |  |  |  |  |  |  |  |
Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 270,002,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 21,622,000 | 24,940,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 248,789,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 0 |  |  |  |  |  |  |  |  |
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 | 409,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 15,611,000 | 15,611,000 | $ 15,618,000 | $ 15,604,000 | $ 15,602,000 | $ 16,070,000 | $ 16,816,000 | $ 16,311,000 | $ 15,752,000 | $ 15,845,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 680 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 15,611,000 | 15,611,000 | 15,606,000 | 15,475,000 | 15,460,000 | 15,336,000 | 14,420,000 | 13,212,000 | 9,452,000 | 6,379,000
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 | 48,329,000 | 48,389,000 | 48,141,000 | 48,249,000 | 47,905,000 | 47,797,000 | 47,661,000 | 47,721,000 | 47,315,000 | 48,290,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,881 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 48,329,000 | 48,320,000 | 48,089,000 | 47,776,000 | 47,703,000 | 47,482,000 | 47,296,000 | 46,573,000 | 44,482,000 | $ 39,871,000
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 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 | $ 279,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 821 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 26,920,000 | 26,714,000 | 26,693,000 | 26,428,000 | 26,325,000 | 26,272,000 | 25,772,000 | 26,948,000 | 27,812,000 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 2,316 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 26,920,000 | 26,600,000 | 26,137,000 | 26,125,000 | 26,019,000 | 25,374,000 | 24,863,000 | 24,964,000 | $ 17,151,000 |
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 23,935,000 | 38,526,000 | 23,945,000 | 23,397,000 | 23,816,000 | 22,578,000 | 25,043,000 | 37,837,000 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 351,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,143 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 23,583,000 | 38,063,000 | 23,506,000 | 22,266,000 | 21,410,000 | 19,114,000 | 16,217,000 | 10,638,000 |  |
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 | 33,302,000 | 33,302,000 | 33,320,000 | 33,337,000 | 33,412,000 | 33,471,000 | 33,987,000 | 33,863,000 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 29,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 785 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 33,273,000 | 33,251,000 | 33,246,000 | 33,252,000 | 33,119,000 | 32,961,000 | 32,715,000 | $ 26,529,000 |  |
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 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 | $ 16,647,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 4,242 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 14,063,000 | 14,183,000 | 14,203,000 | 14,398,000 | 13,864,000 | 21,325,000 | 20,741,000 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 28,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,104 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 14,028,000 | 13,835,000 | 13,970,000 | 13,758,000 | 13,374,000 | 19,445,000 | $ 13,359,000 |  |  |
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 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 | $ (429,000) |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 3,674 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 20,307,000 | 20,056,000 | 19,669,000 | 19,138,000 | 18,838,000 | 20,421,000 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 279,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,373 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 19,325,000 | 19,262,000 | 18,563,000 | 17,780,000 | 17,305,000 | $ 15,758,000 |  |  |  |
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 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 | $ 1,899,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 5,006 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 9,562,000 | 9,812,000 | 9,704,000 | 10,084,000 | 14,511,000 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 218,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 721 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 9,195,000 | 9,057,000 | 8,894,000 | 8,481,000 | $ 6,459,000 |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2020 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 75,369,000 | 66,177,000 | 68,165,000 | 67,573,000 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 3,408,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 4,664 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 74,858,000 | 69,903,000 | 46,535,000 | 25,068,000 |  |  |  |  |  |
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 | 22,163,000 | 22,080,000 | 22,184,000 | 24,796,000 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 523,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 791 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 21,037,000 | 20,592,000 | 19,976,000 | $ 15,909,000 |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2019 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 29,991,000 | 38,304,000 | 53,338,000 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ (4,413,000) |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,802 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 30,438,000 | 30,946,000 | 34,129,000 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 1,757,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 613 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 27,207,000 | 26,795,000 | $ 22,143,000 |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2020 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 68,194,000 | 65,255,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 18,688,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,515 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 42,845,000 | 7,742,000 |  |  |  |  |  |  |  |
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 | 49,444,000 | 48,641,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 4,653,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 614 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 39,759,000 | $ 32,008,000 |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2021 | Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 25,430,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 15,144,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 314 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 15,474,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 3,332,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 639 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 9,716,000 |  |  |  |  |  |  |  |  |

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