Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Segment	Jun. 30, 2012
Reportable Segments [Abstract]
Number of reportable segments			2
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	$ 92,830	$ 78,854	$ 176,721	$ 168,906
Net Premiums Earned	61,775	59,655	122,873	121,206
Segment Profit	8,315	12,186	18,320	25,256
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	8,315	12,186	18,320	25,256
Net investment income	1,985	2,431	4,395	4,853
Net gains on investments	719	(5,453)	15,066	(73)
Corporate expenses	(3,757)	(3,904)	(7,840)	(7,778)
Income before federal income taxes	7,262	5,260	29,941	22,258
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	80,756	64,760	150,945	139,986
Net Premiums Earned	49,803	48,167	97,663	96,076
Segment Profit	5,405	6,872	10,641	13,795
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	5,405	6,872	10,641	13,795
Reinsurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	12,074	14,094	25,776	28,920
Net Premiums Earned	11,972	11,488	25,210	25,130
Segment Profit	2,910	5,314	7,679	11,461
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	$ 2,910	$ 5,314	$ 7,679	$ 11,461