Segment Information - Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Gross earned premiums	$ 23,546	$ 20,974
Net written premiums	22,050	13,666
Net earned premiums	20,109	14,493
Other income	245	489
Total revenue	20,883	15,613
Losses and loss adjustment expenses, net	12,699	8,570
Policy acquisition costs	6,003	2,595
Operating expenses	4,139	3,692
Total expenses	22,998	15,101
Net investment income	537	486
Net realized investment gains (losses)	(8)	145
Interest expense	(157)	(244)
Income (loss) before income taxes	(2,115)	512
Operating Segments [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	25,393	21,204
Net written premiums	22,050	13,666
Net earned premiums	20,109	14,493
Other income	245	489
Total revenue	20,354	14,982
Losses and loss adjustment expenses, net	12,699	8,570
Policy acquisition costs	6,003	2,595
Operating expenses	4,139	3,692
Total expenses	22,841	14,857
Segment underwriting gain (loss)	(2,487)	125
Operating Segments [Member] | Commercial Lines [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	19,144	15,742
Net written premiums	16,986	9,854
Net earned premiums	15,279	9,488
Other income	98	349
Total revenue	15,377	9,837
Losses and loss adjustment expenses, net	8,635	5,317
Policy acquisition costs	4,388	1,738
Operating expenses	1,734	1,472
Total expenses	14,757	8,527
Segment underwriting gain (loss)	620	1,310
Operating Segments [Member] | Commercial Lines [Member] | Commercial Multi-peril [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	12,121	9,662
Net written premiums	10,599	5,818
Net earned premiums	9,438	6,126
Other income	60	306
Total revenue	9,498	6,432
Losses and loss adjustment expenses, net	4,402	3,780
Policy acquisition costs	2,843	1,119
Operating expenses	1,247	1,032
Total expenses	8,492	5,931
Segment underwriting gain (loss)	1,006	501
Operating Segments [Member] | Commercial Lines [Member] | Other Liability [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	3,400	2,298
Net written premiums	3,084	1,426
Net earned premiums	2,357	1,222
Other income	33	38
Total revenue	2,390	1,260
Losses and loss adjustment expenses, net	1,489	454
Policy acquisition costs	732	208
Operating expenses	249	254
Total expenses	2,470	916
Segment underwriting gain (loss)	(80)	344
Operating Segments [Member] | Commercial Lines [Member] | Auto [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	2,531	2,676
Net written premiums	2,265	1,815
Net earned premiums	2,588	1,610
Other income	5	5
Total revenue	2,593	1,615
Losses and loss adjustment expenses, net	2,498	1,065
Policy acquisition costs	661	330
Operating expenses	131	114
Total expenses	3,290	1,509
Segment underwriting gain (loss)	(697)	106
Operating Segments [Member] | Commercial Lines [Member] | Other [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	1,092	1,106
Net written premiums	1,038	795
Net earned premiums	896	530
Other income	0	0
Total revenue	896	530
Losses and loss adjustment expenses, net	246	18
Policy acquisition costs	152	81
Operating expenses	107	72
Total expenses	505	171
Segment underwriting gain (loss)	391	359
Operating Segments [Member] | Personal Lines [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	6,249	5,462
Net written premiums	5,064	3,812
Net earned premiums	4,830	5,005
Other income	132	128
Total revenue	4,962	5,133
Losses and loss adjustment expenses, net	4,064	3,253
Policy acquisition costs	1,615	857
Operating expenses	669	413
Total expenses	6,348	4,523
Segment underwriting gain (loss)	(1,386)	610
Operating Segments [Member] | Personal Lines [Member] | Auto [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	1	807
Net written premiums	1	807
Net earned premiums	2	1,422
Other income	0	56
Total revenue	2	1,478
Losses and loss adjustment expenses, net	546	1,499
Policy acquisition costs	0	238
Operating expenses	32	197
Total expenses	578	1,934
Segment underwriting gain (loss)	(576)	(456)
Operating Segments [Member] | Personal Lines [Member] | Low-value Dwelling [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	2,311	1,588
Net written premiums	2,031	1,011
Net earned premiums	1,761	1,488
Other income	112	63
Total revenue	1,873	1,551
Losses and loss adjustment expenses, net	1,140	872
Policy acquisition costs	582	394
Operating expenses	355	101
Total expenses	2,077	1,367
Segment underwriting gain (loss)	(204)	184
Operating Segments [Member] | Personal Lines [Member] | Wind-exposed Homeowners [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	3,937	3,067
Net written premiums	3,032	1,994
Net earned premiums	3,067	2,095
Other income	20	9
Total revenue	3,087	2,104
Losses and loss adjustment expenses, net	2,378	882
Policy acquisition costs	1,033	225
Operating expenses	282	115
Total expenses	3,693	1,222
Segment underwriting gain (loss)	(606)	882
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Gross earned premiums	0	0
Net written premiums	0	0
Net earned premiums	0	0
Other income	15	12
Total revenue	15	12
Losses and loss adjustment expenses, net	0	0
Policy acquisition costs	0	0
Operating expenses	1,736	1,807
Total expenses	1,736	1,807
Segment underwriting gain (loss)	(1,721)	(1,795)
Corporate [Member]
Segment Reporting Information [Line Items]
Net investment income	537	486
Net realized investment gains (losses)	(8)	145
Interest expense	(157)	(244)
Income (loss) before income taxes	$ (1,349)	$ (1,408)