Segment Information - Information by Reportable Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Gross written premiums	$ 28,497	$ 24,242	$ 83,616	$ 68,505
Net written premiums	24,634	28,599	72,861	58,207
Net earned premiums	23,380	17,883	65,164	47,491
Other income	303	523	829	1,492
Segment revenue	23,683	18,406	65,993	48,983
Losses and loss adjustment expenses, net	14,582	9,813	40,822	27,359
Policy acquisition costs	6,266	4,605	18,282	9,839
Operating expenses	4,710	3,325	13,384	10,636
Total expenses	25,558	17,743	72,488	47,834
Segment underwriting gain (loss)	(1,875)	663	(6,495)	1,149
Net investment income	560	505	1,625	1,460
Net realized investment gains	71	6	604	238
Other gains	0	104	0	104
Interest expense	(168)	(181)	(468)	(664)
Income (loss) before equity earnings of affiliates and income taxes	(1,412)	1,097	(4,734)	2,287
Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Gross written premiums	20,759	16,655	62,725	50,723
Net written premiums	18,230	20,786	55,767	43,164
Net earned premiums	17,878	13,621	49,641	33,779
Other income	81	390	263	1,064
Segment revenue	17,959	14,011	49,904	34,843
Losses and loss adjustment expenses, net	9,564	7,043	27,543	17,837
Policy acquisition costs	4,868	3,448	13,619	7,103
Operating expenses	1,803	1,304	5,147	3,987
Total expenses	16,235	11,795	46,309	28,927
Segment underwriting gain (loss)	1,724	2,216	3,595	5,916
Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Gross written premiums	7,738	7,587	20,891	17,782
Net written premiums	6,404	7,813	17,094	15,043
Net earned premiums	5,502	4,262	15,523	13,712
Other income	101	115	419	351
Segment revenue	5,603	4,377	15,942	14,063
Losses and loss adjustment expenses, net	5,018	2,770	13,279	9,522
Policy acquisition costs	1,398	1,157	4,663	2,736
Operating expenses	779	1,182	2,214	1,805
Total expenses	7,195	5,109	20,156	14,063
Segment underwriting gain (loss)	(1,592)	(732)	(4,214)	0
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	121	18	147	77
Segment revenue	121	18	147	77
Losses and loss adjustment expenses, net	0	0	0	0
Policy acquisition costs	0	0	0	0
Operating expenses	2,128	839	6,023	4,844
Total expenses	2,128	839	6,023	4,844
Segment underwriting gain (loss)	(2,007)	(821)	(5,876)	(4,767)
Net investment income	560	505	1,625	1,460
Net realized investment gains	71	6	604	238
Other gains		104		104
Interest expense	(168)	(181)	(468)	(664)
Income (loss) before equity earnings of affiliates and income taxes	$ (1,544)	$ (387)	$ (4,115)	$ (3,629)