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LOSS AND LOSS ADJUSTMENT RESERVES - (Schedule of Incurred Losses and ALAE, Net of Reinsurance) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
reported_claim
Dec. 31, 2019
USD ($)
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 ($)
Dec. 31, 2011
USD ($)
Homeowners                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 1,405,999                  
Homeowners | 2011                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 26,375 $ 26,394 $ 26,394 $ 26,143 $ 25,957 $ 24,582 $ 23,932 $ 23,007 $ 21,344 $ 20,492
IBNR & development on reported claims $ 12                  
Cumulative number of reported claims | reported_claim 2,428,000                  
Homeowners | 2012                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 26,984 26,951 26,836 26,356 25,889 24,468 24,186 23,301 23,032  
IBNR & development on reported claims $ 85                  
Cumulative number of reported claims | reported_claim 2,694,000                  
Homeowners | 2013                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 38,088 37,978 37,880 37,185 35,859 35,834 42,021 43,807    
IBNR & development on reported claims $ 15                  
Cumulative number of reported claims | reported_claim 3,431,000                  
Homeowners | 2014                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 62,535 62,043 61,817 62,206 61,770 63,300 64,312      
IBNR & development on reported claims $ 378                  
Cumulative number of reported claims | reported_claim 7,606,000                  
Homeowners | 2015                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 96,144 94,703 94,760 95,129 92,411 99,497        
IBNR & development on reported claims $ 1,522                  
Cumulative number of reported claims | reported_claim 13,038,000                  
Homeowners | 2016                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 156,316 157,880 158,764 162,043 171,264          
IBNR & development on reported claims $ 1,394                  
Cumulative number of reported claims | reported_claim 22,614,000                  
Homeowners | 2017                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 179,327 188,548 192,769 202,844            
IBNR & development on reported claims $ 47,728                  
Cumulative number of reported claims | reported_claim 67,165,000                  
Homeowners | 2018                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 216,570 213,128 210,158              
IBNR & development on reported claims $ 20,849                  
Cumulative number of reported claims | reported_claim 35,817,000                  
Homeowners | 2019                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 261,541 257,644                
IBNR & development on reported claims $ 23,909                  
Cumulative number of reported claims | reported_claim 19,661,000                  
Homeowners | 2020                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 342,119                  
IBNR & development on reported claims $ 236,080                  
Cumulative number of reported claims | reported_claim 35,117,000                  
Commercial general liability                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 72,220                  
Commercial general liability | 2011                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 9,394 7,817 6,828 6,254 5,409 4,760 4,603 4,749 5,854 6,436
IBNR & development on reported claims $ 1,572                  
Cumulative number of reported claims | reported_claim 1,367                  
Commercial general liability | 2012                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,431 5,109 4,509 4,346 4,658 4,700 4,801 4,952 5,279  
IBNR & development on reported claims $ 1,209                  
Cumulative number of reported claims | reported_claim 817                  
Commercial general liability | 2013                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 7,588 5,984 5,580 5,704 5,502 5,221 5,069 7,095    
IBNR & development on reported claims $ 1,245                  
Cumulative number of reported claims | reported_claim 759                  
Commercial general liability | 2014                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 9,028 6,697 6,348 6,620 6,384 7,709 7,475      
IBNR & development on reported claims $ 1,549                  
Cumulative number of reported claims | reported_claim 1,016                  
Commercial general liability | 2015                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 9,141 7,947 5,377 6,020 7,008 8,082        
IBNR & development on reported claims $ 2,043                  
Cumulative number of reported claims | reported_claim 877                  
Commercial general liability | 2016                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 12,267 8,502 6,561 5,809 10,727          
IBNR & development on reported claims $ 3,086                  
Cumulative number of reported claims | reported_claim 845                  
Commercial general liability | 2017                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 8,519 6,558 7,853 8,289            
IBNR & development on reported claims $ 3,369                  
Cumulative number of reported claims | reported_claim 639                  
Commercial general liability | 2018                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 7,280 6,233 6,553              
IBNR & development on reported claims $ 4,281                  
Cumulative number of reported claims | reported_claim 420                  
Commercial general liability | 2019                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 2,535 1,604                
IBNR & development on reported claims $ 1,826                  
Cumulative number of reported claims | reported_claim 114                  
Commercial general liability | 2020                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 37                  
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims | reported_claim 6                  
Automobile                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 68,723                  
Automobile | 2011                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 2,760 2,762 2,756 2,796 2,848 2,762 2,912 2,954 3,350 $ 3,580
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims | reported_claim 789                  
Automobile | 2012                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 1,448 1,444 1,448 1,491 1,455 1,424 1,717 1,741 $ 1,735  
IBNR & development on reported claims $ 4                  
Cumulative number of reported claims | reported_claim 824                  
Automobile | 2013                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 2,127 2,127 2,123 2,161 1,829 1,826 1,863 $ 1,517    
IBNR & development on reported claims $ 6                  
Cumulative number of reported claims | reported_claim 3,471                  
Automobile | 2014                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 4,413 4,417 4,379 4,315 3,551 3,213 $ 2,038      
IBNR & development on reported claims $ 4                  
Cumulative number of reported claims | reported_claim 6,019                  
Automobile | 2015                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 2,944 2,915 2,878 2,781 2,882 $ 3,045        
IBNR & development on reported claims $ 14                  
Cumulative number of reported claims | reported_claim 6,553                  
Automobile | 2016                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 25,923 25,918 24,346 20,205 $ 13,414          
IBNR & development on reported claims $ 251                  
Cumulative number of reported claims | reported_claim 67,655                  
Automobile | 2017                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 24,669 24,579 22,472 $ 20,411            
IBNR & development on reported claims $ 740                  
Cumulative number of reported claims | reported_claim 52,885                  
Automobile | 2018                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 4,439 4,623 $ 3,513              
IBNR & development on reported claims $ 887                  
Cumulative number of reported claims | reported_claim 9,604                  
Automobile | 2019                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 0 $ (3)                
IBNR & development on reported claims $ 2                  
Cumulative number of reported claims | reported_claim 101                  
Automobile | 2020                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 0                  
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims | reported_claim 1