Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Segment	Jun. 30, 2015 USD ($)
Reportable Segments [Abstract]
Number of reportable segments | Segment			2
Segment Reporting Information [Line Items]
Net Premium Earned	$ 68,726	$ 65,449	$ 135,635	$ 131,895
Reconciliation from segment totals to consolidated [Abstract]
Income before federal income taxes	8,915	8,430	30,353	17,721
Reportable Segments [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	100,046	92,795	196,199	189,775
Net Premium Earned	68,726	65,449	135,635	131,895
Segment Profit (Loss)	9,616	10,771	22,815	17,695
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	9,616	10,771	22,815	17,695
Reportable Segments [Member] | Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	98,374	89,163	191,462	179,676
Net Premium Earned	65,714	60,031	129,142	119,315
Segment Profit (Loss)	9,897	10,358	23,641	16,682
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	9,897	10,358	23,641	16,682
Reportable Segments [Member] | Reinsurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	1,672	3,632	4,737	10,099
Net Premium Earned	3,012	5,418	6,493	12,580
Segment Profit (Loss)	(281)	413	(826)	1,013
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	(281)	413	(826)	1,013
Segment Reconciling Items [Member]
Reconciliation from segment totals to consolidated [Abstract]
Net investment income	3,549	2,898	6,988	5,713
Net realized gains (losses) on investments	280	(1,166)	9,292	2,577
Corporate expenses and other	$ (4,530)	$ (4,073)	$ (8,742)	$ (8,264)