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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, 2017
USD ($)
$ / Claim
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 ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Personal Auto Liability [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 57,998                  
Personal Auto Liability [Member] | Accident Year 2008 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 554 $ 554 $ 554 $ 554 $ 554 $ 572 $ 561 $ 562 $ 615 $ 752
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 170                  
Severity | $ / Claim 3                  
Personal Auto Liability [Member] | Accident Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 243 243 243 243 258 264 259 267 272  
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 63                  
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 $ 3,041 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 1,139                  
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 $ 2,796 2,848 2,762 2,912 2,954 3,350 3,580      
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 918                  
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 $ 1,491 1,455 1,424 1,717 1,741 1,735        
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 918                  
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 $ 2,161 1,829 1,826 1,863 1,517          
IBNR & development on reported claims $ 61                  
Cumulative number of reported claims 3,533                  
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 $ 4,315 3,551 3,213 2,038            
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 6,109                  
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 $ 2,781 2,882 3,045              
IBNR & development on reported claims $ 49                  
Cumulative number of reported claims 6,883                  
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 $ 20,205 13,414                
IBNR & development on reported claims $ 1,258                  
Cumulative number of reported claims 40,384                  
Severity | $ / Claim 0                  
Personal Auto Liability [Member] | Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 20,411                  
IBNR & development on reported claims $ 8,912                  
Cumulative number of reported claims 23,557                  
Severity | $ / Claim 0                  
Homeowners [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 685,146                  
Homeowners [Member] | Accident Year 2008 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 15,608 15,609 15,604 15,661 16,021 15,659 15,977 15,811 15,784 18,305
IBNR & development on reported claims $ 5                  
Cumulative number of reported claims 1,710                  
Severity | $ / Claim 9                  
Homeowners [Member] | Accident Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 27,173 27,163 27,119 27,041 27,015 26,482 25,955 25,618 26,228  
IBNR & development on reported claims $ 104                  
Cumulative number of reported claims 2,334                  
Severity | $ / Claim 12                  
Homeowners [Member] | Accident Year 2010 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 30,459 29,945 29,407 28,968 27,895 26,151 25,056 24,825    
IBNR & development on reported claims $ 35                  
Cumulative number of reported claims 2,389                  
Severity | $ / Claim 13                  
Homeowners [Member] | Accident Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 26,143 25,957 24,582 23,932 23,007 21,344 20,492      
IBNR & development on reported claims $ 27                  
Cumulative number of reported claims 2,423                  
Severity | $ / Claim 11                  
Homeowners [Member] | Accident Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 26,356 25,889 24,468 24,186 23,301 23,032        
IBNR & development on reported claims $ 14                  
Cumulative number of reported claims 2,677                  
Severity | $ / Claim 10                  
Homeowners [Member] | Accident Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 37,185 35,859 35,834 42,021 43,807          
IBNR & development on reported claims $ 402                  
Cumulative number of reported claims 3,415                  
Severity | $ / Claim 11                  
Homeowners [Member] | Accident Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 62,206 61,770 63,300 64,312            
IBNR & development on reported claims $ 1,730                  
Cumulative number of reported claims 7,564                  
Severity | $ / Claim 8                  
Homeowners [Member] | Accident Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 95,129 92,411 99,497              
IBNR & development on reported claims $ 6,260                  
Cumulative number of reported claims 13,292                  
Severity | $ / Claim 7                  
Homeowners [Member] | Accident Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 162,043 171,264                
IBNR & development on reported claims $ 18,842                  
Cumulative number of reported claims 26,562                  
Severity | $ / Claim 5                  
Homeowners [Member] | Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 202,844                  
IBNR & development on reported claims $ 81,261                  
Cumulative number of reported claims 54,717                  
Severity | $ / Claim 2                  
Commercial General Liability [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 82,511                  
Commercial General Liability [Member] | Accident Year 2008 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance 20,039 18,453 16,839 16,297 15,584 16,083 17,260 17,271 17,448 $ 16,615
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 1,553                  
Severity | $ / Claim 13                  
Commercial General Liability [Member] | Accident Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 11,621 11,081 10,466 10,192 9,270 11,943 12,220 12,397 $ 13,297  
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 899                  
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 $ 7,809 7,645 7,597 7,535 7,045 7,474 7,582 $ 8,552    
IBNR & development on reported claims $ 0                  
Cumulative number of reported claims 673                  
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 $ 6,254 5,409 4,760 4,603 4,749 5,854 $ 6,436      
IBNR & development on reported claims $ 136                  
Cumulative number of reported claims 856                  
Severity | $ / Claim 7                  
Commercial General Liability [Member] | Accident Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 4,346 4,658 4,700 4,801 4,952 $ 5,279        
IBNR & development on reported claims $ 127                  
Cumulative number of reported claims 452                  
Severity | $ / Claim 9                  
Commercial General Liability [Member] | Accident Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 5,704 5,502 5,221 5,069 $ 7,095          
IBNR & development on reported claims $ 129                  
Cumulative number of reported claims 523                  
Severity | $ / Claim 11                  
Commercial General Liability [Member] | Accident Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,620 6,384 7,709 $ 7,475            
IBNR & development on reported claims $ 178                  
Cumulative number of reported claims 578                  
Severity | $ / Claim 11                  
Commercial General Liability [Member] | Accident Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 6,020 7,008 $ 8,082              
IBNR & development on reported claims $ 260                  
Cumulative number of reported claims 660                  
Severity | $ / Claim 9                  
Commercial General Liability [Member] | Accident Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 5,809 $ 10,727                
IBNR & development on reported claims $ 658                  
Cumulative number of reported claims 617                  
Severity | $ / Claim 8                  
Commercial General Liability [Member] | Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred, claims and allocated claim adjustment expenses, net of reinsurance $ 8,289                  
IBNR & development on reported claims $ 4,038                  
Cumulative number of reported claims 391                  
Severity | $ / Claim 11