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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 323,340,000 | $ 398,409,000 |  |  |  |  |  |  |  |
Property and Casualty, Commercial Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 434,445,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 72,390,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 362,056,000 |  |  |  |  |  |  |  |  |
Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 2,544,021,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 250,950,000 | 322,605,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 2,293,396,000 |  |  |  |  |  |  |  |  |
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 | 1,000 |  |  |  |  |  |  |  |  |
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 | 325,000 |  |  |  |  |  |  |  |  |
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 | 12,584,000 | 12,584,000 | $ 12,580,000 | $ 12,641,000 | $ 12,615,000 | $ 8,671,000 | $ 9,771,000 | $ 9,690,000 | $ 9,540,000 | $ 11,404,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 802 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 12,584,000 | 12,584,000 | 12,580,000 | 12,576,000 | 12,575,000 | 8,552,000 | 7,543,000 | 6,893,000 | 6,942,000 | 4,583,000
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 | 78,528,000 | 78,306,000 | 78,299,000 | 78,454,000 | 78,202,000 | 78,147,000 | 77,800,000 | 78,273,000 | 79,089,000 | 75,872,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 79,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 12,057 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 78,420,000 | 77,979,000 | 77,867,000 | 78,004,000 | 77,781,000 | 77,461,000 | 75,365,000 | 72,917,000 | 68,271,000 | $ 47,811,000
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 | 7,328,000 | 7,262,000 | 7,263,000 | 7,426,000 | 7,573,000 | 8,382,000 | 11,826,000 | 6,420,000 | 8,359,000 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 741 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 7,327,000 | 7,261,000 | 7,262,000 | 7,256,000 | 7,254,000 | 7,248,000 | 5,317,000 | 5,127,000 | 2,958,000 |
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 | 99,464,000 | 99,338,000 | 99,187,000 | 98,706,000 | 98,649,000 | 98,438,000 | 98,442,000 | 100,572,000 | 105,118,000 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 44,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 8,900 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 99,021,000 | 98,666,000 | 98,424,000 | 97,945,000 | 97,415,000 | 96,193,000 | 93,879,000 | 89,842,000 | $ 66,657,000 |
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 | 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 | $ 11,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 680 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 2016 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 140,507,000 | 140,695,000 | 140,354,000 | 139,967,000 | 140,052,000 | 139,418,000 | 138,415,000 | 139,163,000 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 90,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 13,462 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 140,346,000 | 139,812,000 | 139,137,000 | 138,257,000 | 137,534,000 | 133,819,000 | 125,849,000 | $ 92,383,000 |  |
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 | 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 | $ 145,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 821 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 2017 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 217,223,000 | 217,198,000 | 216,278,000 | 215,894,000 | 215,221,000 | 215,680,000 | 201,328,000 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 253,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 20,350 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 216,011,000 | 214,817,000 | 213,968,000 | 211,040,000 | 207,021,000 | 193,127,000 | $ 134,992,000 |  |  |
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 | 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 | $ 316,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,140 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 23,506,000 | 22,266,000 | 21,410,000 | 19,114,000 | 16,217,000 | 10,638,000 |  |  |  |
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 | 275,142,000 | 273,797,000 | 271,795,000 | 271,207,000 | 269,228,000 | 267,124,000 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 644,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 31,115 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 271,536,000 | 268,953,000 | 267,015,000 | 261,089,000 | 248,852,000 | $ 183,238,000 |  |  |  |
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 | 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 | $ 2,173,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 4,239 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 80,460,000 | 73,683,000 | 64,329,000 | 62,353,000 | 40,467,000 |  |  |  |  |
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 | 295,511,000 | 288,161,000 | 280,048,000 | 273,512,000 | 261,689,000 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 4,166,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 85,881 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 286,362,000 | 275,698,000 | 263,657,000 | 251,530,000 | $ 177,516,000 |  |  |  |  |
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 | 68,384,000 | 69,203,000 | 64,964,000 | 61,778,000 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ (530,000) |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 3,666 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 66,848,000 | 61,885,000 | 54,551,000 | 27,852,000 |  |  |  |  |  |
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 | 339,347,000 | 333,763,000 | 324,877,000 | 299,141,000 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 502,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 48,081 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 331,438,000 | 318,619,000 | 297,871,000 | $ 219,513,000 |  |  |  |  |  |
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 | 68,900,000 | 70,515,000 | 76,515,000 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 1,729,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 4,982 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 62,133,000 | 57,041,000 | 38,428,000 |  |  |  |  |  |  |
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 | 332,682,000 | 316,649,000 | 344,912,000 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 6,540,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 40,369 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 309,014,000 | 270,923,000 | $ 202,105,000 |  |  |  |  |  |  |
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 | 68,165,000 | 67,573,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ (8,785,000) |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 4,581 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 46,535,000 | 25,068,000 |  |  |  |  |  |  |  |
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 | 452,090,000 | 484,372,000 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 9,570,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 58,299 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 414,666,000 | $ 244,512,000 |  |  |  |  |  |  |  |
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 | 53,338,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 21,844,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 1,600 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 19,754,000 |  |  |  |  |  |  |  |  |
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 | 313,527,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 132,514,000 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | 48,823 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 146,582,000 |  |  |  |  |  |  |  |  |

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