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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($)
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
Dec. 31, 2013
Claims Development                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 504,782,000 $ 323,340,000                
Property and Casualty, Commercial Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 477,575,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 80,256,000 72,390,000                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 397,319,000                  
Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 2,976,312,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 424,526,000 250,950,000                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,551,990,000                  
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 204,000                  
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 7,326,000 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 $ 7,326,000 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 2014 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 99,451,000 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 $ 11,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 8,893                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 99,040,000 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 2015 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 15,611,000 15,618,000 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 15,606,000 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 2015 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 140,712,000 140,507,000 140,695,000 140,354,000 139,967,000 140,052,000 139,418,000 138,415,000 139,163,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 67,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 13,470                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 140,639,000 140,346,000 139,812,000 139,137,000 138,257,000 137,534,000 133,819,000 125,849,000 $ 92,383,000  
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 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 $ 275,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 821                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 28,024,000 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 2016 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 217,302,000 217,223,000 217,198,000 216,278,000 215,894,000 215,221,000 215,680,000 201,328,000    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 217,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 20,341                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 216,833,000 216,011,000 214,817,000 213,968,000 211,040,000 207,021,000 193,127,000 $ 134,992,000    
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 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 $ 392,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,140                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 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 2017 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 275,316,000 275,142,000 273,797,000 271,795,000 271,207,000 269,283,000 267,124,000      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 528,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 31,129                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 272,567,000 271,536,000 268,953,000 267,015,000 261,089,000 248,852,000 $ 183,238,000      
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 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 $ 1,541,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 4,240                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 84,933,000 80,460,000 73,683,000 64,329,000 62,353,000 40,467,000        
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 297,468,000 295,511,000 288,161,000 280,048,000 273,512,000 261,689,000        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,812,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 83,534                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 293,474,000 286,362,000 275,698,000 263,657,000 251,530,000 $ 177,516,000        
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 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 $ 295,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,669                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 82,443,000 66,848,000 61,885,000 54,551,000 27,852,000          
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 344,943,000 339,347,000 333,763,000 324,877,000 299,141,000          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3,904,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 53,064                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 335,531,000 331,438,000 318,619,000 297,871,000 $ 219,513,000          
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 41,424,000 68,900,000 70,515,000 76,515,000            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,878,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 5,175                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 34,768,000 62,133,000 57,041,000 38,428,000            
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 350,005,000 332,682,000 316,649,000 344,912,000            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 14,441,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 44,328                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 326,540,000 309,014,000 270,923,000 $ 202,105,000            
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 66,177,000 68,165,000 67,573,000              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (6,017,000)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 4,640                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 69,903,000 46,535,000 25,068,000              
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 526,579,000 452,090,000 484,372,000              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 28,642,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 57,085                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 479,639,000 414,666,000 $ 244,512,000              
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 38,304,000 53,338,000                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6,154,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,770                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 28,506,000 19,754,000                
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 326,446,000 313,527,000                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 47,388,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 57,485                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 259,094,000 $ 146,582,000                
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 65,255,000                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 53,640,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,401                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7,742,000                  
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 398,090,000                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 229,083,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 39,597                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 128,633,000