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LOSS AND LOSS ADJUSTMENT RESERVES - (Schedule of Incurred Losses and ALAE, Net of Reinsurance) (Details)
$ / Claim in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
$ / Claim
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 ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Homeowners [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 867,139                  
Homeowners [Member] | Accident Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 27,159 $ 27,173 $ 27,163 $ 27,119 $ 27,041 $ 27,015 $ 26,482 $ 25,955 $ 25,618 $ 26,228
IBNR & development on reported claims $ 141                  
Cumulative number of reported claims 2,334,000                  
Severity | $ / Claim 12                  
Homeowners [Member] | Accident Year 2010 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 30,602 30,459 29,945 29,407 28,968 27,895 26,151 25,056 24,825  
IBNR & development on reported claims $ 30                  
Cumulative number of reported claims 2,391,000                  
Severity | $ / Claim 13                  
Homeowners [Member] | Accident Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 26,394 26,143 25,957 24,582 23,932 23,007 21,344 20,492    
IBNR & development on reported claims $ 25                  
Cumulative number of reported claims 2,428,000                  
Severity | $ / Claim 11                  
Homeowners [Member] | Accident Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 26,836 26,356 25,889 24,468 24,186 23,301 23,032      
IBNR & development on reported claims $ 38                  
Cumulative number of reported claims 2,691,000                  
Severity | $ / Claim 10                  
Homeowners [Member] | Accident Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 37,880 37,185 35,859 35,834 42,021 43,807        
IBNR & development on reported claims $ 139                  
Cumulative number of reported claims 3,427,000                  
Severity | $ / Claim 11                  
Homeowners [Member] | Accident Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 61,817 62,206 61,770 63,300 64,312          
IBNR & development on reported claims $ 636                  
Cumulative number of reported claims 7,621,000                  
Severity | $ / Claim 8                  
Homeowners [Member] | Accident Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 94,760 95,129 92,411 99,497            
IBNR & development on reported claims $ 2,232                  
Cumulative number of reported claims 13,137,000                  
Severity | $ / Claim 7                  
Homeowners [Member] | Accident Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 158,764 162,043 171,264              
IBNR & development on reported claims $ 11,832                  
Cumulative number of reported claims 23,982,000                  
Severity | $ / Claim 6                  
Homeowners [Member] | Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 192,769 202,844                
IBNR & development on reported claims $ 62,363                  
Cumulative number of reported claims 62,200,000                  
Severity | $ / Claim 2                  
Homeowners [Member] | Accident Year 2018 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 210,158                  
IBNR & development on reported claims $ 91,887                  
Cumulative number of reported claims 28,532,000                  
Severity | $ / Claim 4                  
Commercial General Liability [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 70,733                  
Commercial General Liability [Member] | Accident Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 12,872 11,621 11,081 10,466 10,192 9,270 11,943 12,220 12,397 13,297
IBNR & development on reported claims $ 5                  
Cumulative number of reported claims 988                  
Severity | $ / Claim 13                  
Commercial General Liability [Member] | Accident Year 2010 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 8,252 7,809 7,645 7,597 7,535 7,045 7,474 7,582 8,552  
IBNR & development on reported claims $ 72                  
Cumulative number of reported claims 691                  
Severity | $ / Claim 12                  
Commercial General Liability [Member] | Accident Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,828 6,254 5,409 4,760 4,603 4,749 5,854 6,436    
IBNR & development on reported claims $ 63                  
Cumulative number of reported claims 1,058                  
Severity | $ / Claim 6                  
Commercial General Liability [Member] | Accident Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 4,509 4,346 4,658 4,700 4,801 4,952 5,279      
IBNR & development on reported claims $ 121                  
Cumulative number of reported claims 538                  
Severity | $ / Claim 8                  
Commercial General Liability [Member] | Accident Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 5,580 5,704 5,502 5,221 5,069 7,095        
IBNR & development on reported claims $ 219                  
Cumulative number of reported claims 573                  
Severity | $ / Claim 9                  
Commercial General Liability [Member] | Accident Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,348 6,620 6,384 7,709 7,475          
IBNR & development on reported claims $ 161                  
Cumulative number of reported claims 673                  
Severity | $ / Claim 9                  
Commercial General Liability [Member] | Accident Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 5,377 6,020 7,008 8,082            
IBNR & development on reported claims $ 215                  
Cumulative number of reported claims 713                  
Severity | $ / Claim 7                  
Commercial General Liability [Member] | Accident Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,561 5,809 10,727              
IBNR & development on reported claims $ 402                  
Cumulative number of reported claims 695                  
Severity | $ / Claim 9                  
Commercial General Liability [Member] | Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 7,853 8,289                
IBNR & development on reported claims $ 4,634                  
Cumulative number of reported claims 530                  
Severity | $ / Claim 6                  
Commercial General Liability [Member] | Accident Year 2018 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,553                  
IBNR & development on reported claims $ 5,254                  
Cumulative number of reported claims 313                  
Severity | $ / Claim 4                  
Personal Auto Liability [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 67,199                  
Personal Auto Liability [Member] | Accident Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 242 243 243 243 243 258 264 259 267 $ 272
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 57                  
Severity | $ / Claim 4                  
Personal Auto Liability [Member] | Accident Year 2010 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 3,042 3,041 3,059 3,035 3,044 3,088 3,111 2,963 $ 2,823  
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 969                  
Severity | $ / Claim 3                  
Personal Auto Liability [Member] | Accident Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 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 789                  
Severity | $ / Claim 3                  
Personal Auto Liability [Member] | Accident Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 1,448 1,491 1,455 1,424 1,717 1,741 $ 1,735      
IBNR & development on reported claims $ 2                  
Cumulative number of reported claims 822                  
Severity | $ / Claim 2                  
Personal Auto Liability [Member] | Accident Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 2,123 2,161 1,829 1,826 1,863 $ 1,517        
IBNR & development on reported claims $ 9                  
Cumulative number of reported claims 3,468                  
Severity | $ / Claim 1                  
Personal Auto Liability [Member] | Accident Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 4,379 4,315 3,551 3,213 $ 2,038          
IBNR & development on reported claims $ 14                  
Cumulative number of reported claims 6,006                  
Severity | $ / Claim 1                  
Personal Auto Liability [Member] | Accident Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 2,878 2,781 2,882 $ 3,045            
IBNR & development on reported claims $ 62                  
Cumulative number of reported claims 6,498                  
Severity | $ / Claim 0                  
Personal Auto Liability [Member] | Accident Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 24,346 20,205 $ 13,414              
IBNR & development on reported claims $ 482                  
Cumulative number of reported claims 45,423                  
Severity | $ / Claim 1                  
Personal Auto Liability [Member] | Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 22,472 $ 20,411                
IBNR & development on reported claims $ 2,222                  
Cumulative number of reported claims 31,169                  
Severity | $ / Claim 1                  
Personal Auto Liability [Member] | Accident Year 2018 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 3,513                  
IBNR & development on reported claims $ 2,230                  
Cumulative number of reported claims 6,241                  
Severity | $ / Claim 0