Segment Information - Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Gross written premiums	$ 29,725	$ 23,059	$ 55,118	$ 44,263
Net written premiums	26,176	15,942	48,226	29,608
Net earned premiums	21,675	15,115	41,784	29,608
Other income	283	480	528	969
Segment revenue	21,958	15,595	42,312	30,577
Losses and loss adjustment expenses, net	13,541	8,976	26,240	17,546
Policy acquisition costs	6,014	2,639	12,017	5,234
Operating expenses	4,536	3,619	8,675	7,311
Total expenses	24,091	15,234	46,932	30,091
Segment underwriting gain (loss)	(2,133)	361	(4,620)	486
Net investment income	528	469	1,065	955
Net realized investment gains	541	87	533	232
Interest expense	(143)	(239)	(300)	(483)
Income (loss) before equity earnings of affiliates and income taxes	(1,207)	678	(3,322)	1,190
Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Gross written premiums	22,821	18,326	41,965	34,068
Net written premiums	20,548	12,524	37,536	22,378
Net earned premiums	16,484	10,670	31,763	20,158
Other income	83	325	182	674
Segment revenue	16,567	10,995	31,945	20,832
Losses and loss adjustment expenses, net	9,344	5,477	17,980	10,794
Policy acquisition costs	4,366	1,917	8,752	3,655
Operating expenses	1,610	1,211	3,344	2,683
Total expenses	15,320	8,605	30,076	17,132
Segment underwriting gain (loss)	1,247	2,390	1,869	3,700
Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Gross written premiums	6,904	4,733	13,153	10,195
Net written premiums	5,628	3,418	10,690	7,230
Net earned premiums	5,191	4,445	10,021	9,450
Other income	187	108	318	236
Segment revenue	5,378	4,553	10,339	9,686
Losses and loss adjustment expenses, net	4,197	3,499	8,260	6,752
Policy acquisition costs	1,648	722	3,265	1,579
Operating expenses	766	210	1,435	623
Total expenses	6,611	4,431	12,960	8,954
Segment underwriting gain (loss)	(1,233)	122	(2,621)	732
Corporate & Other
Segment Reporting Information [Line Items]
Gross written premiums	0	0	0	0
Net written premiums	0	0	0	0
Net earned premiums	0	0	0	0
Other income	13	47	28	59
Segment revenue	13	47	28	59
Losses and loss adjustment expenses, net	0	0	0	0
Policy acquisition costs	0	0	0	0
Operating expenses	2,160	2,198	3,896	4,005
Total expenses	2,160	2,198	3,896	4,005
Segment underwriting gain (loss)	(2,147)	(2,151)	(3,868)	(3,946)
Net investment income	528	469	1,065	955
Net realized investment gains	541	87	533	232
Interest expense	(143)	(239)	(300)	(483)
Income (loss) before equity earnings of affiliates and income taxes	$ (1,221)	$ (1,834)	$ (2,570)	$ (3,242)