Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 30, 2012
Reportable Segments [Abstract]
Number of reportable segments			2
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	$ 96,550	$ 81,237	$ 273,271	$ 250,143
Net Premiums Earned	64,448	54,853	187,321	176,059
Segment Profit	11,558	10,628	29,878	35,884
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	11,558	10,628	29,878	35,884
Net investment income	2,192	2,343	6,587	7,196
Net gains on investments	1,430	8,781	16,496	8,709
Corporate expenses	(3,488)	(4,198)	(11,328)	(11,977)
Income before federal income taxes	11,692	17,554	41,633	39,812
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	82,272	68,072	233,217	208,058
Net Premiums Earned	52,036	42,972	149,699	139,048
Segment Profit	9,712	5,089	20,353	18,871
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	9,712	5,089	20,353	18,871
Reinsurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	14,278	13,165	40,054	42,085
Net Premiums Earned	12,412	11,881	37,622	37,011
Segment Profit	1,846	5,539	9,525	17,013
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	$ 1,846	$ 5,539	$ 9,525	$ 17,013