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Loss and Loss Adjustment Expense Reserves - Incurred and paid claims development (Details)
Dec. 31, 2025
USD ($)
claim
Dec. 31, 2024
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Dec. 31, 2023
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Dec. 31, 2022
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Dec. 31, 2021
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Dec. 31, 2020
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Dec. 31, 2019
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Dec. 31, 2018
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Dec. 31, 2017
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Dec. 31, 2016
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incurred and paid claims development                    
Liabilities for claims and claims adjustment expenses, net of reinsurance $ 579,829,000                  
Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,856,768,000                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 1,584,748,000                  
All outstanding liabilities before 2015, net of reinsurance 253,000                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 272,273,000                  
Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,460,767,000                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 1,445,181,000                  
All outstanding liabilities before 2015, net of reinsurance 1,000                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 15,587,000                  
Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 433,714,000                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 319,221,000                  
All outstanding liabilities before 2015, net of reinsurance 41,000                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 114,534,000                  
Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 223,207,000                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 218,626,000                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 4,581,000                  
Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 102,388,000                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 60,212,000                  
All outstanding liabilities before 2015, net of reinsurance 31,000                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 42,207,000                  
Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 796,189,000                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 713,974,000                  
All outstanding liabilities before 2015, net of reinsurance 1,000                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 82,216,000                  
Other short-Duration Insurance Lines                    
incurred and paid claims development                    
Liabilities for claims and claims adjustment expenses, net of reinsurance 48,431,000                  
2016 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 176,504,000 $ 176,533,000 $ 176,509,000 $ 176,700,000 $ 176,600,000 $ 177,009,000 $ 180,486,000 $ 185,009,000 $ 192,318,000 $ 192,912,000
Cumulative Number of Reported claims | claim 49,386                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 176,504,000 176,368,000 176,242,000 175,803,000 174,410,000 171,865,000 167,458,000 154,964,000 137,917,000 78,862,000
2016 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 121,589,000 121,584,000 121,566,000 121,615,000 121,570,000 121,543,000 121,717,000 122,116,000 124,922,000 129,528,000
Cumulative Number of Reported claims | claim 126,091                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 121,590,000 121,590,000 121,597,000 121,618,000 121,634,000 121,660,000 121,795,000 122,023,000 124,298,000 133,530,000
2016 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 40,344,000 40,362,000 40,487,000 40,767,000 40,996,000 40,679,000 40,916,000 40,947,000 39,416,000 37,954,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 15,000                  
Cumulative Number of Reported claims 6,457                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 40,324,000 40,314,000 40,248,000 39,233,000 38,275,000 36,237,000 32,274,000 25,711,000 19,902,000 9,991,000
2016 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 17,733,000 17,735,000 17,721,000 17,721,000 17,713,000 17,725,000 17,808,000 17,909,000 18,506,000 20,216,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,000                  
Cumulative Number of Reported claims | claim 13,593                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 17,732,000 17,734,000 17,720,000 17,721,000 17,712,000 17,709,000 17,712,000 17,763,000 18,143,000 17,228,000
2016 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 8,167,000 8,500,000 8,572,000 8,873,000 9,491,000 9,491,000 9,847,000 10,594,000 10,594,000 10,594,000
Cumulative Number of Reported claims | claim 277                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 8,167,000 8,167,000 8,166,000 7,628,000 7,128,000 6,300,000 5,387,000 4,257,000 2,669,000 647,000
2016 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 59,790,000 59,457,000 59,709,000 59,857,000 59,898,000 60,019,000 61,262,000 64,208,000 66,442,000 67,116,000
Cumulative Number of Reported claims | claim 5,421                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 59,458,000 59,457,000 59,456,000 59,493,000 59,428,000 59,403,000 59,449,000 59,155,000 57,238,000 $ 44,103,000
2017 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 175,463,000 175,463,000 175,513,000 176,564,000 177,320,000 177,941,000 182,068,000 184,429,000 185,673,000  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (66,000)                  
Cumulative Number of Reported claims | claim 46,265                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 175,271,000 174,928,000 174,207,000 172,362,000 169,024,000 164,467,000 153,675,000 133,037,000 77,519,000  
2017 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 123,896,000 123,904,000 123,775,000 123,779,000 123,777,000 123,715,000 124,128,000 126,304,000 128,340,000  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (40,000)                  
Cumulative Number of Reported claims | claim 124,029                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 123,880,000 123,872,000 123,816,000 123,795,000 123,839,000 123,844,000 124,286,000 126,822,000 132,409,000  
2017 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 37,420,000 37,645,000 37,874,000 38,185,000 39,232,000 39,369,000 41,055,000 41,373,000 42,865,000  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 33,000                  
Cumulative Number of Reported claims 6,136                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 37,108,000 36,394,000 34,960,000 33,569,000 31,389,000 28,721,000 24,409,000 20,106,000 10,407,000  
2017 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 18,760,000 18,763,000 18,760,000 18,774,000 18,780,000 18,834,000 19,021,000 19,200,000 19,691,000  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,000                  
Cumulative Number of Reported claims | claim 13,113                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 18,759,000 18,761,000 18,758,000 18,772,000 18,786,000 18,787,000 18,915,000 19,336,000 17,957,000  
2017 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 6,626,000 6,715,000 6,689,000 7,053,000 7,819,000 8,585,000 9,328,000 10,058,000 11,276,000  
Cumulative Number of Reported claims | claim 269                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 5,922,000 5,159,000 4,902,000 4,765,000 4,217,000 3,593,000 2,913,000 1,676,000 305,000  
2017 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 66,953,000 66,864,000 67,130,000 67,388,000 67,530,000 68,737,000 70,689,000 76,560,000 80,736,000  
Cumulative Number of Reported claims | claim 6,012                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 66,860,000 66,863,000 66,865,000 66,826,000 66,765,000 66,892,000 66,181,000 64,401,000 $ 46,366,000  
2018 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 167,067,000 166,769,000 166,164,000 166,046,000 168,185,000 170,447,000 175,222,000 176,411,000    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (87,000)                  
Cumulative Number of Reported claims | claim 43,104                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 166,664,000 165,800,000 164,000,000 159,066,000 154,169,000 143,656,000 126,456,000 72,895,000    
2018 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 127,967,000 127,971,000 127,991,000 128,003,000 128,090,000 128,426,000 130,145,000 129,450,000    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (2,000)                  
Cumulative Number of Reported claims | claim 119,764                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 127,969,000 127,987,000 128,005,000 128,054,000 128,154,000 128,624,000 132,591,000 138,036,000    
2018 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 35,791,000 35,364,000 35,154,000 36,014,000 37,322,000 38,589,000 40,115,000 41,347,000    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (114,000)                  
Cumulative Number of Reported claims 5,747                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 35,520,000 34,108,000 32,996,000 29,336,000 26,774,000 23,544,000 18,499,000 9,704,000    
2018 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,121,000 19,118,000 19,149,000 19,196,000 19,210,000 19,270,000 19,937,000 21,230,000    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 2,000                  
Cumulative Number of Reported claims | claim 12,908                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 19,119,000 19,116,000 19,147,000 19,194,000 19,208,000 19,236,000 19,842,000 18,842,000    
2018 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,786,000 8,061,000 8,245,000 8,616,000 9,768,000 9,951,000 9,951,000 9,951,000    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 81,000                  
Cumulative Number of Reported claims | claim 257                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 7,088,000 7,073,000 6,958,000 5,664,000 4,597,000 3,972,000 2,039,000 551,000    
2018 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 73,334,000 73,059,000 73,730,000 73,996,000 74,989,000 77,970,000 82,581,000 83,443,000    
Cumulative Number of Reported claims | claim 8,239                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 73,019,000 73,060,000 73,334,000 73,307,000 73,119,000 72,078,000 70,959,000 $ 57,704,000    
2019 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 166,788,000 166,244,000 166,175,000 166,940,000 170,477,000 174,439,000 176,171,000      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (928,000)                  
Cumulative Number of Reported claims | claim 40,610                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 166,085,000 164,523,000 161,134,000 154,633,000 143,570,000 127,910,000 72,219,000      
2019 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 123,832,000 123,834,000 123,781,000 123,858,000 124,332,000 126,648,000 128,698,000      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (10,000)                  
Cumulative Number of Reported claims | claim 117,041                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 123,842,000 123,858,000 123,811,000 123,974,000 124,467,000 128,173,000 134,429,000      
2019 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 43,911,000 44,541,000 45,363,000 46,964,000 48,783,000 49,163,000 51,679,000      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (187,000)                  
Cumulative Number of Reported claims 5,691                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 43,260,000 41,355,000 39,233,000 36,048,000 28,373,000 22,480,000 12,113,000      
2019 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 18,676,000 18,675,000 18,672,000 18,685,000 18,956,000 19,652,000 20,039,000      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 2,000                  
Cumulative Number of Reported claims | claim 12,759                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 18,674,000 18,673,000 18,672,000 18,681,000 18,752,000 19,161,000 18,128,000      
2019 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,389,000 8,513,000 9,175,000 11,371,000 11,949,000 13,848,000 14,130,000      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 33,000                  
Cumulative Number of Reported claims | claim 266                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 8,031,000 7,835,000 7,218,000 6,038,000 5,183,000 3,343,000 1,634,000      
2019 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 64,592,000 64,468,000 64,950,000 65,624,000 68,769,000 73,697,000 77,976,000      
Cumulative Number of Reported claims | claim 5,453                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 64,463,000 64,468,000 64,412,000 64,427,000 63,536,000 61,905,000 $ 49,121,000      
2020 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 118,505,000 118,255,000 117,985,000 120,060,000 125,888,000 130,335,000        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (1,773,000)                  
Cumulative Number of Reported claims | claim 26,259                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 117,925,000 115,776,000 112,143,000 102,601,000 88,037,000 52,962,000        
2020 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 97,691,000 97,679,000 97,668,000 97,644,000 97,244,000 98,546,000        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (15,000)                  
Cumulative Number of Reported claims | claim 81,883                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 97,694,000 97,707,000 97,755,000 98,083,000 98,819,000 102,764,000        
2020 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 28,259,000 29,099,000 29,865,000 30,869,000 31,930,000 35,010,000        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (321,000)                  
Cumulative Number of Reported claims 3,472                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 25,257,000 22,295,000 19,635,000 16,268,000 13,166,000 7,025,000        
2020 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 16,315,000 16,368,000 16,434,000 16,606,000 16,334,000 16,507,000        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 2,000                  
Cumulative Number of Reported claims | claim 9,625                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 16,313,000 16,315,000 16,340,000 16,407,000 16,596,000 15,550,000        
2020 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,456,000 8,982,000 9,686,000 11,025,000 13,708,000 14,664,000        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 310,000                  
Cumulative Number of Reported claims | claim 225                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 7,728,000 7,288,000 6,870,000 3,845,000 3,254,000 220,000        
2020 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 69,309,000 68,783,000 69,503,000 72,622,000 76,638,000 80,093,000        
Cumulative Number of Reported claims | claim 6,117                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 68,523,000 68,496,000 68,495,000 68,706,000 65,927,000 $ 50,304,000        
2021 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 147,931,000 147,626,000 148,015,000 147,391,000 146,997,000          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (4,283,000)                  
Cumulative Number of Reported claims | claim 30,310                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 145,535,000 140,442,000 130,556,000 111,516,000 56,826,000          
2021 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 121,561,000 121,581,000 121,619,000 122,549,000 122,943,000          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (21,000)                  
Cumulative Number of Reported claims | claim 89,667                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 121,580,000 121,653,000 122,204,000 123,847,000 123,636,000          
2021 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 37,645,000 37,655,000 38,634,000 39,564,000 41,814,000          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 227,000                  
Cumulative Number of Reported claims 4,315                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 33,443,000 29,627,000 25,647,000 17,925,000 7,883,000          
2021 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 21,458,000 21,806,000 21,810,000 21,524,000 20,156,000          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (3,000)                  
Cumulative Number of Reported claims | claim 11,523                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 21,461,000 21,531,000 21,533,000 21,620,000 18,610,000          
2021 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 11,572,000 12,194,000 12,797,000 12,797,000 12,797,000          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 192,000                  
Cumulative Number of Reported claims | claim 226                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 9,555,000 8,678,000 6,573,000 3,388,000 218,000          
2021 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 73,569,000 72,947,000 74,140,000 75,011,000 75,696,000          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (12,000)                  
Cumulative Number of Reported claims | claim 6,355                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 70,543,000 70,655,000 70,118,000 67,998,000 $ 51,390,000          
2022 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 157,689,000 154,269,000 152,752,000 157,921,000            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (5,716,000)                  
Cumulative Number of Reported claims | claim 30,613                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 151,500,000 139,922,000 118,918,000 61,227,000            
2022 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 144,469,000 144,262,000 143,366,000 141,041,000            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (60,000)                  
Cumulative Number of Reported claims | claim 95,029                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 144,524,000 144,879,000 146,130,000 142,004,000            
2022 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 43,661,000 43,417,000 43,061,000 43,496,000            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (2,938,000)                  
Cumulative Number of Reported claims 4,595                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 36,586,000 28,791,000 22,702,000 10,941,000            
2022 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 27,521,000 27,884,000 28,007,000 27,459,000            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (6,000)                  
Cumulative Number of Reported claims | claim 12,800                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 27,527,000 27,637,000 27,806,000 24,380,000            
2022 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,255,000 9,491,000 11,770,000 12,973,000            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 509,000                  
Cumulative Number of Reported claims | claim 214                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 5,308,000 4,170,000 2,597,000 451,000            
2022 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 72,791,000 70,555,000 71,467,000 72,524,000            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 182,000                  
Cumulative Number of Reported claims | claim 5,040                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 69,762,000 70,112,000 66,990,000 $ 48,906,000            
2023 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 200,536,000 200,152,000 203,726,000              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (17,173,000)                  
Cumulative Number of Reported claims | claim 36,702                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 182,221,000 154,276,000 78,289,000              
2023 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 175,550,000 175,980,000 180,863,000              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (170,000)                  
Cumulative Number of Reported claims | claim 106,624                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 175,694,000 176,863,000 171,437,000              
2023 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 45,611,000 45,832,000 46,690,000              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (3,877,000)                  
Cumulative Number of Reported claims 4,462                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 30,250,000 22,749,000 9,615,000              
2023 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 27,365,000 28,013,000 29,564,000              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 192,000                  
Cumulative Number of Reported claims | claim 12,096                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 27,174,000 27,508,000 25,889,000              
2023 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 10,752,000 11,850,000 12,891,000              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 754,000                  
Cumulative Number of Reported claims | claim 183                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 3,882,000 2,010,000 287,000              
2023 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 108,300,000 107,202,000 113,941,000              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (547,000)                  
Cumulative Number of Reported claims | claim 6,595                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 96,962,000 94,600,000 $ 68,479,000              
2024 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 260,839,000 258,638,000                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (18,528,000)                  
Cumulative Number of Reported claims | claim 43,339                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 193,622,000 95,621,000                
2024 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 202,049,000 216,309,000                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (322,000)                  
Cumulative Number of Reported claims | claim 122,159                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 201,826,000 202,584,000                
2024 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 53,761,000 55,812,000                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 918,000                  
Cumulative Number of Reported claims 4,591                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 25,076,000 10,870,000                
2024 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 27,108,000 27,641,000                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 202,000                  
Cumulative Number of Reported claims | claim 12,260                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 26,851,000 24,392,000                
2024 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,636,000 14,736,000                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 2,145,000                  
Cumulative Number of Reported claims | claim 202                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 3,535,000 1,344,000                
2024 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 94,553,000 93,453,000                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (13,157,000)                  
Cumulative Number of Reported claims | claim 4,822                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 82,360,000 $ 56,582,000                
2025 | Private Passenger Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 285,446,000                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 7,735,000                  
Cumulative Number of Reported claims | claim 38,856                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 109,421,000                  
2025 | Private Passenger Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 222,163,000                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (21,580,000)                  
Cumulative Number of Reported claims | claim 118,506                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 206,582,000                  
2025 | Commercial Automobile Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 67,311,000                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 17,886,000                  
Cumulative Number of Reported claims 3,976                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 12,397,000                  
2025 | Commercial Automobile Physical Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 29,150,000                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 553,000                  
Cumulative Number of Reported claims | claim 11,576                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 25,016,000                  
2025 | Homeowners Liability                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,749,000                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 6,214,000                  
Cumulative Number of Reported claims | claim 195                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 996,000                  
2025 | Homeowners Property Damage                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 112,998,000                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (11,720,000)                  
Cumulative Number of Reported claims | claim 4,434                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 62,024,000