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Unpaid Losses and Loss Adjustment Expenses - Loss Development (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]                    
Incurred $ 478,034                  
Total IBNR 32,702                  
Cumulative Paid 385,580                  
Unpaid losses and ALAE, years 2012 through 2021 92,454                  
Unpaid losses and ALAE, prior to 2012 141                  
Unpaid losses and ALAE, net of reinsurance 92,595                  
Commercial Lines                    
Claims Development [Line Items]                    
Incurred 366,009                  
Total IBNR 31,821                  
Cumulative Paid 275,688                  
Unpaid losses and ALAE, years 2012 through 2021 90,321                  
Unpaid losses and ALAE, prior to 2012 141                  
Unpaid losses and ALAE, net of reinsurance 90,462                  
Personal Lines                    
Claims Development [Line Items]                    
Incurred 112,025                  
Total IBNR 881                  
Cumulative Paid 109,892                  
Unpaid losses and ALAE, years 2012 through 2021 2,133                  
Unpaid losses and ALAE, net of reinsurance 2,133                  
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred 18,705 $ 18,627 $ 18,578 $ 18,566 $ 18,554 $ 18,642 $ 18,544 $ 18,028 $ 18,111 $ 17,705
Total IBNR $ 0                  
Cumulative number of reported claims | claim 3,910                  
Cumulative Paid $ 18,696 18,627 18,558 18,538 18,369 18,195 17,335 15,540 12,954 7,990
Accident Year 2012 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 6,255 6,245 6,209 6,209 6,190 6,253 6,384 6,288 6,421 7,745
Total IBNR $ 0                  
Cumulative number of reported claims | claim 571                  
Cumulative Paid $ 6,246 6,245 6,209 6,209 6,065 5,994 5,558 4,696 3,703 2,325
Accident Year 2012 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 12,450 12,382 12,369 12,357 12,365 12,390 12,159 11,740 11,690 9,960
Total IBNR $ 0                  
Cumulative number of reported claims | claim 3,339                  
Cumulative Paid $ 12,450 12,382 12,349 12,329 12,306 12,202 11,777 10,844 9,251 $ 5,665
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred 31,094 31,030 30,846 30,420 30,419 29,375 28,817 27,431 28,052  
Total IBNR $ 40                  
Cumulative number of reported claims | claim 5,820                  
Cumulative Paid $ 30,929 30,842 30,351 29,824 29,162 27,223 25,695 22,094 13,934  
Accident Year 2013 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 11,867 11,804 11,624 11,218 11,252 10,237 9,893 9,435 10,018  
Total IBNR $ 40                  
Cumulative number of reported claims | claim 612                  
Cumulative Paid $ 11,702 11,620 11,137 10,650 10,147 8,622 7,643 6,211 3,979  
Accident Year 2013 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 19,227 19,226 19,222 19,202 19,167 19,138 18,925 17,996 18,034  
Total IBNR $ 0                  
Cumulative number of reported claims | claim 5,208                  
Cumulative Paid $ 19,227 19,222 19,214 19,174 19,014 18,600 18,052 15,883 $ 9,955  
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred 47,272 47,140 46,848 46,074 44,247 40,446 37,378 37,660    
Total IBNR $ 125                  
Cumulative number of reported claims | claim 5,490                  
Cumulative Paid $ 46,718 46,457 45,591 43,464 40,192 34,718 30,492 21,534    
Accident Year 2014 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 29,175 29,045 28,766 28,145 26,367 22,711 19,907 19,709    
Total IBNR $ 125                  
Cumulative number of reported claims | claim 1,753                  
Cumulative Paid $ 28,648 28,389 27,544 25,609 22,446 17,458 13,977 8,715    
Accident Year 2014 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 18,097 18,095 18,082 17,929 17,880 17,735 17,471 17,951    
Total IBNR $ 0                  
Cumulative number of reported claims | claim 3,737                  
Cumulative Paid $ 18,070 18,068 18,047 17,855 17,746 17,260 16,515 $ 12,819    
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred 54,251 53,222 51,736 49,763 46,581 40,078 33,319      
Total IBNR $ 293                  
Cumulative number of reported claims | claim 4,513                  
Cumulative Paid $ 52,979 51,123 49,747 45,634 36,393 29,690 18,241      
Accident Year 2015 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 38,824 37,795 36,372 34,478 31,861 26,633 22,442      
Total IBNR $ 293                  
Cumulative number of reported claims | claim 2,361                  
Cumulative Paid $ 37,563 35,833 34,497 30,475 22,549 17,817 10,470      
Accident Year 2015 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 15,427 15,427 15,364 15,285 14,721 13,445 10,877      
Total IBNR $ 0                  
Cumulative number of reported claims | claim 2,152                  
Cumulative Paid $ 15,416 15,290 15,250 15,159 13,844 11,873 $ 7,771      
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred 62,627 61,744 59,905 55,389 48,353 44,015        
Total IBNR $ 620                  
Cumulative number of reported claims | claim 5,370                  
Cumulative Paid $ 59,096 57,296 53,077 42,227 30,373 17,374        
Accident Year 2016 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 46,993 46,089 44,355 40,440 34,935 32,396        
Total IBNR $ 620                  
Cumulative number of reported claims | claim 3,556                  
Cumulative Paid $ 43,644 41,945 37,967 27,785 19,135 10,255        
Accident Year 2016 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 15,634 15,655 15,550 14,949 13,418 11,619        
Total IBNR $ 0                  
Cumulative number of reported claims | claim 1,814                  
Cumulative Paid $ 15,452 15,351 15,110 14,442 11,238 $ 7,119        
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred 70,500 66,676 64,242 58,045 58,309          
Total IBNR $ 1,451                  
Cumulative number of reported claims | claim 8,744                  
Cumulative Paid $ 62,014 56,834 48,209 35,964 20,768          
Accident Year 2017 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 55,589 51,883 49,749 44,495 44,251          
Total IBNR $ 1,451                  
Cumulative number of reported claims | claim 5,828                  
Cumulative Paid $ 47,148 42,308 34,205 23,020 12,448          
Accident Year 2017 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 14,911 14,793 14,493 13,550 14,058          
Total IBNR $ 0                  
Cumulative number of reported claims | claim 2,916                  
Cumulative Paid $ 14,866 14,526 14,004 12,944 $ 8,320          
Accident Year 2018                    
Claims Development [Line Items]                    
Incurred 61,643 56,024 48,810 48,517            
Total IBNR $ 1,901                  
Cumulative number of reported claims | claim 6,915                  
Cumulative Paid $ 47,819 37,733 25,417 14,671            
Accident Year 2018 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 55,261 49,741 42,432 42,624            
Total IBNR $ 1,901                  
Cumulative number of reported claims | claim 6,113                  
Cumulative Paid $ 41,577 31,633 19,799 10,375            
Accident Year 2018 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 6,382 6,283 6,378 5,893            
Total IBNR $ 0                  
Cumulative number of reported claims | claim 802                  
Cumulative Paid $ 6,242 6,100 5,618 $ 4,296            
Accident Year 2019                    
Claims Development [Line Items]                    
Incurred 49,227 44,841 44,385              
Total IBNR $ 3,640                  
Cumulative number of reported claims | claim 6,629                  
Cumulative Paid $ 31,650 23,066 12,197              
Accident Year 2019 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 46,329 42,129 41,286              
Total IBNR $ 3,640                  
Cumulative number of reported claims | claim 6,288                  
Cumulative Paid $ 28,958 20,462 10,078              
Accident Year 2019 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 2,898 2,712 3,099              
Total IBNR $ 0                  
Cumulative number of reported claims | claim 341                  
Cumulative Paid $ 2,692 2,604 $ 2,119              
Accident Year 2020                    
Claims Development [Line Items]                    
Incurred 37,918 36,206                
Total IBNR $ 7,375                  
Cumulative number of reported claims | claim 4,147                  
Cumulative Paid $ 19,787 11,524                
Accident Year 2020 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 35,328 33,867                
Total IBNR $ 7,268                  
Cumulative number of reported claims | claim 3,782                  
Cumulative Paid $ 17,332 10,217                
Accident Year 2020 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 2,590 2,339                
Total IBNR $ 107                  
Cumulative number of reported claims | claim 365                  
Cumulative Paid $ 2,455 $ 1,307                
Accident Year 2021                    
Claims Development [Line Items]                    
Incurred 44,797                  
Total IBNR $ 17,257                  
Cumulative number of reported claims | claim 3,093                  
Cumulative Paid $ 15,892                  
Accident Year 2021 | Commercial Lines                    
Claims Development [Line Items]                    
Incurred 40,388                  
Total IBNR $ 16,483                  
Cumulative number of reported claims | claim 2,559                  
Cumulative Paid $ 12,870                  
Accident Year 2021 | Personal Lines                    
Claims Development [Line Items]                    
Incurred 4,409                  
Total IBNR $ 774                  
Cumulative number of reported claims | claim 534                  
Cumulative Paid $ 3,022