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SEGMENT INFORMATION - Net premiums earned by segment and lines of insurance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue from External Customer [Line Items]        
Premiums earned $ 163,708 $ 155,190 $ 477,440 $ 449,514
Property and casualty insurance [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 126,213 120,472 366,340 350,307
Property and casualty insurance [Member] | Commercial Lines [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 116,138 110,781 337,328 322,132
Property and casualty insurance [Member] | Commercial Lines [Member] | Automobile Insurance L O B [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 32,851 30,229 95,155 87,275
Property and casualty insurance [Member] | Commercial Lines [Member] | Property Insurance L O B [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 25,271 27,980 79,059 79,551
Property and casualty insurance [Member] | Commercial Lines [Member] | Workers' Compensation [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 24,249 25,373 74,380 75,419
Property and casualty insurance [Member] | Commercial Lines [Member] | Other Liability [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 31,399 24,996 81,952 73,378
Property and casualty insurance [Member] | Commercial Lines [Member] | Other Insurance L O B [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 2,368 2,203 6,782 6,509
Property and casualty insurance [Member] | Personal Lines [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 10,075 9,691 29,012 28,175
Reinsurance [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 37,495 34,718 111,100 99,207
Reinsurance [Member] | Assumed Pro Rata [Member]        
Revenue from External Customer [Line Items]        
Premiums earned 10,484 10,730 33,627 33,181
Reinsurance [Member] | Assumed Excess of Loss [Member]        
Revenue from External Customer [Line Items]        
Premiums earned $ 27,011 $ 23,988 $ 77,473 $ 66,026