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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Claims Development                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 65,645,000 $ 74,003,000                
Property and Casualty, Commercial Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 65,645,000 74,003,000                
Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 538,916,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 65,645,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 473,273,000                  
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,000                  
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 28,434,000 28,678,000 $ 28,680,000 $ 28,350,000 $ 26,910,000 $ 26,332,000 $ 26,614,000 $ 24,563,000 $ 20,379,000 $ 16,504,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 823                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 28,433,000 28,057,000 28,024,000 27,303,000 25,269,000 23,605,000 22,978,000 20,640,000 17,134,000 $ 10,188,000
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 40,371,000 40,369,000 54,960,000 40,379,000 39,831,000 40,250,000 39,012,000 41,477,000 54,343,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 349,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 999                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 40,021,000 40,017,000 54,497,000 39,940,000 38,700,000 37,844,000 35,548,000 32,651,000 $ 25,567,000  
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 78,782,000 80,536,000 91,545,000 87,833,000 83,286,000 78,970,000 72,135,000 70,650,000    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 12,756,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,627                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 61,771,000 54,143,000 84,933,000 80,460,000 73,683,000 64,329,000 62,353,000 $ 40,467,000    
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 67,908,000 67,238,000 84,727,000 68,384,000 69,203,000 64,964,000 61,778,000      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (834,000)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,842                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 68,496,000 67,193,000 82,443,000 66,848,000 61,885,000 54,551,000 $ 27,852,000      
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 70,596,000 70,611,000 41,424,000 68,900,000 70,515,000 76,515,000        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,905,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,859                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 64,817,000 64,274,000 34,768,000 62,133,000 57,041,000 $ 38,428,000        
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 88,589,000 85,036,000 75,844,000 77,831,000 77,482,000          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (679,000)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 5,094                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 87,433,000 84,525,000 79,570,000 56,201,000 $ 33,532,000          
Short-duration Insurance Contracts, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 31,737,000 29,991,000 38,304,000 53,338,000            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,008,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 4,226                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 35,492,000 32,033,000 28,506,000 $ 19,754,000            
Short-Duration Insurance Contract, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 77,959,000 77,097,000 74,158,000              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 10,442,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,390                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 64,360,000 51,748,000 $ 16,645,000              
Short-Duration Insurance Contract, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 20,813,000 25,430,000                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6,867,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 413                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 13,557,000 $ 8,993,000                
Short-Duration Insurance Contract, Accident Year 2021 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 33,727,000                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 18,572,000                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 415                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 8,893,000