Segment Information - Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Gross premiums written	$ 25,245	$ 24,242	$ 23,059	$ 21,204	$ 28,267	$ 18,912	$ 19,001	$ 17,667
Net written premiums	21,467	28,599	15,942	13,666	16,681	16,217	16,692	16,709	$ 79,674	$ 66,299	$ 37,648
Net earned premiums	19,274	17,883	15,115	14,493	16,325	14,571	13,957	12,675	66,765	57,528	27,629
Other income	175	523	480	489	385	387	505	532	1,667	1,809	834
Total revenue									70,723	60,929	33,476
Losses and loss adjustment expenses, net	11,523	9,813	8,976	8,570	10,253	10,215	9,686	10,576	38,882	40,730	15,824
Policy acquisition costs	6,344	4,605	2,639	2,595	4,208	3,738	3,519	3,231	16,183	14,696	7,667
Operating expenses	4,170	3,325	3,619	3,692	2,599	3,433	3,213	2,894	14,806	12,139	9,161
Total expenses									70,640	68,149	33,193
Investment income	442	505	469	486	352	321	282	220	1,902	1,175	1,000
Net realized investment gains	47	6	87	145	151	94	81	91	285	417	299
Other gains	0	104	0	0					104	0	3,714
Interest expense	(105)	$ (181)	$ (239)	$ (244)	(224)	$ (108)	$ (123)	$ (129)	(769)	(584)	(541)
Income (loss) before income taxes									83	(7,220)	283
Deferred policy acquisition costs	12,102				5,679				12,102	5,679	5,747	$ 2,766
Unearned premiums	47,916				43,381				47,916	43,381
Loss and loss adjustment expense reserves	35,422				31,531				35,422	31,531	28,908	$ 24,843
Personal Lines [Member] | Auto [Member]
Segment Reporting Information [Line Items]
Net earned premiums									2,600	11,600	6,900
Income (loss) before income taxes									(2,700)	(2,400)	(1,700)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Gross premiums written									93,750	83,847	44,087
Net written premiums									79,674	66,299	37,648
Net earned premiums									66,765	57,528	27,629
Other income									1,667	1,809	834
Total revenue									68,432	59,337	28,463
Losses and loss adjustment expenses, net									38,882	40,730	15,824
Policy acquisition costs									16,183	14,696	7,667
Operating expenses									14,806	12,139	9,161
Total expenses									69,871	67,565	32,652
Segment underwriting gain (loss)									(1,439)	(8,228)	(4,189)
Deferred policy acquisition costs	12,102				5,679				12,102	5,679	5,747
Unearned premiums	47,916				43,381				47,916	43,381	26,505
Loss and loss adjustment expense reserves	35,422				31,531				35,422	31,531	28,908
Operating Segments [Member] | Commercial Lines [Member]
Segment Reporting Information [Line Items]
Gross premiums written									68,197	55,056	27,321
Net written premiums									58,157	40,958	22,633
Net earned premiums									48,586	35,749	15,720
Other income									1,099	918	357
Total revenue									49,685	36,667	16,077
Losses and loss adjustment expenses, net									25,730	20,621	5,628
Policy acquisition costs									11,937	9,209	3,973
Operating expenses									4,983	4,566	4,865
Total expenses									42,650	34,396	14,466
Segment underwriting gain (loss)									7,035	2,271	1,611
Deferred policy acquisition costs	8,401				4,247				8,401	4,247	3,668
Unearned premiums	33,337				29,062				33,337	29,062	15,977
Loss and loss adjustment expense reserves	29,739				22,451				29,739	22,451	17,069
Operating Segments [Member] | Commercial Lines [Member] | Commercial Multi-peril [Member]
Segment Reporting Information [Line Items]
Gross premiums written									42,360	35,613	21,133
Net written premiums									35,514	25,702	17,431
Net earned premiums									30,271	24,246	11,699
Other income									333	766	305
Total revenue									30,604	25,012	12,004
Losses and loss adjustment expenses, net									17,171	14,668	6,122
Policy acquisition costs									7,760	6,265	2,966
Operating expenses									3,215	3,330	3,714
Total expenses									28,146	24,263	12,802
Segment underwriting gain (loss)									2,458	749	(798)
Deferred policy acquisition costs	5,516				2,958				5,516	2,958	2,954
Unearned premiums	21,515				19,515				21,515	19,515	12,705
Loss and loss adjustment expense reserves	20,734				15,673				20,734	15,673	10,798
Operating Segments [Member] | Commercial Lines [Member] | Other Liability [Member]
Segment Reporting Information [Line Items]
Gross premiums written									10,584	7,745	4,485
Net written premiums									9,050	5,892	4,027
Net earned premiums									7,153	5,373	3,358
Other income									741	129	43
Total revenue									7,894	5,502	3,401
Losses and loss adjustment expenses, net									2,277	1,638	(1,008)
Policy acquisition costs									1,821	1,453	770
Operating expenses									964	671	776
Total expenses									5,062	3,762	538
Segment underwriting gain (loss)									2,832	1,740	2,863
Deferred policy acquisition costs	1,343				549				1,343	549	514
Unearned premiums	4,780				3,756				4,780	3,756	2,229
Loss and loss adjustment expense reserves	5,295				4,541				5,295	4,541	5,995
Operating Segments [Member] | Commercial Lines [Member] | Auto [Member]
Segment Reporting Information [Line Items]
Gross premiums written									11,445	9,228	769
Net written premiums									10,121	7,459	572
Net earned premiums									8,241	4,564	678
Other income									25	23	9
Total revenue									8,266	4,587	687
Losses and loss adjustment expenses, net									5,402	3,257	342
Policy acquisition costs									1,910	1,187	189
Operating expenses									487	366	170
Total expenses									7,799	4,810	701
Segment underwriting gain (loss)									467	(223)	(14)
Deferred policy acquisition costs	1,300				631				1,300	631	108
Unearned premiums	5,534				4,515				5,534	4,515	425
Loss and loss adjustment expense reserves	2,183				1,301				2,183	1,301	78
Operating Segments [Member] | Commercial Lines [Member] | Other [Member]
Segment Reporting Information [Line Items]
Gross premiums written									3,808	2,470	934
Net written premiums									3,472	1,905	603
Net earned premiums									2,921	1,566	(15)
Other income									0	0	0
Total revenue									2,921	1,566	(15)
Losses and loss adjustment expenses, net									880	1,058	172
Policy acquisition costs									446	304	48
Operating expenses									317	199	205
Total expenses									1,643	1,561	425
Segment underwriting gain (loss)									1,278	5	(440)
Deferred policy acquisition costs	242				109				242	109	92
Unearned premiums	1,508				1,276				1,508	1,276	618
Loss and loss adjustment expense reserves	1,527				936				1,527	936	198
Operating Segments [Member] | Personal Lines [Member]
Segment Reporting Information [Line Items]
Gross premiums written									25,553	28,791	16,766
Net written premiums									21,517	25,341	15,015
Net earned premiums									18,179	21,779	11,909
Other income									489	904	397
Total revenue									18,668	22,683	12,306
Losses and loss adjustment expenses, net									13,152	20,109	10,196
Policy acquisition costs									4,246	5,487	3,694
Operating expenses									3,305	2,453	698
Total expenses									20,703	28,049	14,588
Segment underwriting gain (loss)									(2,035)	(5,366)	(2,282)
Deferred policy acquisition costs	3,701				1,432				3,701	1,432	2,079
Unearned premiums	14,579				14,319				14,579	14,319	10,528
Loss and loss adjustment expense reserves	5,683				9,080				5,683	9,080	11,839
Operating Segments [Member] | Personal Lines [Member] | Auto [Member]
Segment Reporting Information [Line Items]
Gross premiums written									1,072	8,406	6,757
Net written premiums									1,072	8,403	6,758
Net earned premiums									2,645	11,633	6,861
Other income									112	562	59
Total revenue									2,757	12,195	6,920
Losses and loss adjustment expenses, net									3,539	10,465	6,383
Policy acquisition costs									512	2,361	2,053
Operating expenses									1,371	1,745	167
Total expenses									5,422	14,571	8,603
Segment underwriting gain (loss)									(2,665)	(2,376)	(1,683)
Deferred policy acquisition costs	1				203				1	203	730
Unearned premiums	5				1,581				5	1,581	4,809
Loss and loss adjustment expense reserves	2,363				6,502				2,363	6,502	10,034
Operating Segments [Member] | Personal Lines [Member] | Low-value Dwelling [Member]
Segment Reporting Information [Line Items]
Gross premiums written									7,208	8,080	6,250
Net written premiums									5,900	6,835	5,223
Net earned premiums									6,001	6,495	3,895
Other income									260	340	338
Total revenue									6,261	6,835	4,233
Losses and loss adjustment expenses, net									4,362	8,390	2,924
Policy acquisition costs									1,812	1,977	1,148
Operating expenses									963	380	370
Total expenses									7,137	10,747	4,442
Segment underwriting gain (loss)									(876)	(3,912)	(209)
Deferred policy acquisition costs	1,382				789				1,382	789	874
Unearned premiums	4,072				4,081				4,072	4,081	3,380
Loss and loss adjustment expense reserves	1,518				2,211				1,518	2,211	1,165
Operating Segments [Member] | Personal Lines [Member] | Wind-exposed Homeowners [Member]
Segment Reporting Information [Line Items]
Gross premiums written									17,273	12,305	3,759
Net written premiums									14,545	10,103	3,034
Net earned premiums									9,533	3,651	1,153
Other income									117	2	0
Total revenue									9,650	3,653	1,153
Losses and loss adjustment expenses, net									5,251	1,254	889
Policy acquisition costs									1,922	1,149	493
Operating expenses									971	328	161
Total expenses									8,144	2,731	1,543
Segment underwriting gain (loss)									1,506	922	(390)
Deferred policy acquisition costs	2,318				440				2,318	440	475
Unearned premiums	10,502				8,657				10,502	8,657	2,339
Loss and loss adjustment expense reserves	1,802				367				1,802	367	640
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Gross premiums written									0	0	0
Net written premiums									0	0	0
Net earned premiums									0	0	0
Other income									79	(13)	80
Total revenue									79	(13)	80
Losses and loss adjustment expenses, net									0	0	0
Policy acquisition costs									0	0	0
Operating expenses									6,518	5,120	3,598
Total expenses									6,518	5,120	3,598
Segment underwriting gain (loss)									(6,439)	(5,133)	(3,518)
Deferred policy acquisition costs	0				0				0	0	0
Unearned premiums	0				0				0	0	0
Loss and loss adjustment expense reserves	$ 0				$ 0				0	0	0
Corporate [Member]
Segment Reporting Information [Line Items]
Investment income									1,902	1,175	1,000
Net realized investment gains									285	417	299
Other gains									104	0	3,714
Interest expense									(769)	(584)	(541)
Income (loss) before income taxes									$ (4,917)	$ (4,125)	$ 954