SEGMENT REPORTING Gross Premiums Written by Line of Business (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			1
Gross premiums written	$ 135,596	$ 110,607	$ 362,072	$ 425,507
Gross premiums written, percent	100.00%	100.00%	100.00%	100.00%
Commercial
Segment Reporting Information [Line Items]
Gross premiums written	$ 3,396	$ 5,088	$ 9,426	$ 11,752
Gross premiums written, percent	2.50%	4.60%	2.60%	2.80%
Motor
Segment Reporting Information [Line Items]
Gross premiums written	$ 10,091	$ 11,367	$ 25,136	$ 50,807
Gross premiums written, percent	7.40%	10.30%	6.90%	11.90%
Personal
Segment Reporting Information [Line Items]
Gross premiums written	$ 3,691	$ 3,632	$ 10,326	$ 9,788
Gross premiums written, percent	2.70%	3.30%	2.90%	2.30%
Total Property
Segment Reporting Information [Line Items]
Gross premiums written	$ 17,178	$ 20,087	$ 44,888	$ 72,347
Gross premiums written, percent	12.60%	18.20%	12.40%	17.00%
General Liability
Segment Reporting Information [Line Items]
Gross premiums written	$ 3,224	$ 913	$ 3,920	$ 2,368
Gross premiums written, percent	2.40%	0.80%	1.10%	0.60%
Motor Liability
Segment Reporting Information [Line Items]
Gross premiums written	$ 41,679	$ 47,021	$ 96,729	$ 197,335
Gross premiums written, percent	30.70%	42.50%	26.70%	46.40%
Professional Liability
Segment Reporting Information [Line Items]
Gross premiums written	$ 76	$ 11	$ 199	$ 117
Gross premiums written, percent	0.10%	0.00%	0.10%	0.00%
Workers' Compensation
Segment Reporting Information [Line Items]
Gross premiums written	$ 21,979	$ 14,077	$ 60,908	$ 35,121
Gross premiums written, percent	16.20%	12.70%	16.80%	8.30%
Multi-line
Segment Reporting Information [Line Items]
Gross premiums written	$ 25,820	$ 15,082	$ 67,379	$ 61,173
Gross premiums written, percent	19.00%	13.60%	18.60%	14.40%
Total Casualty
Segment Reporting Information [Line Items]
Gross premiums written	$ 92,778	$ 77,104	$ 229,135	$ 296,114
Gross premiums written, percent	68.40%	69.60%	63.30%	69.70%
Accident & Health
Segment Reporting Information [Line Items]
Gross premiums written	$ 12,418	$ 7,527	$ 40,522	$ 31,065
Gross premiums written, percent	9.30%	6.80%	11.20%	7.20%
Financial
Segment Reporting Information [Line Items]
Gross premiums written	$ 1,817	$ 315	$ 15,704	$ 15,394
Gross premiums written, percent	1.30%	0.30%	4.30%	3.60%
Marine
Segment Reporting Information [Line Items]
Gross premiums written	$ 127	$ (33)	$ 749	$ 94
Gross premiums written, percent	0.10%	0.00%	0.20%	0.00%
Other Specialty
Segment Reporting Information [Line Items]
Gross premiums written	$ 11,278	$ 5,607	$ 31,074	$ 10,493
Gross premiums written, percent	8.30%	5.10%	8.60%	2.50%
Total Other
Segment Reporting Information [Line Items]
Gross premiums written	$ 25,640	$ 13,416	$ 88,049	$ 57,046
Gross premiums written, percent	19.00%	12.20%	24.30%	13.30%