Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Segment	Jun. 30, 2013
Reportable Segments [Abstract]
Number of reportable segments			2
Segment Reporting Information [Line Items]
Net Premiums Earned	$ 62,905	$ 61,775	$ 126,747	$ 122,873
Reconciliation from segment totals to consolidated [Abstract]
Income before federal income taxes	14,037	7,262	23,476	29,941
Operating Segments [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	95,098	92,830	189,852	176,721
Net Premiums Earned	62,905	61,775	126,747	122,873
Segment Profit	8,078	8,315	15,309	18,320
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	8,078	8,315	15,309	18,320
Operating Segments [Member] | Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	85,826	80,756	168,750	150,945
Net Premiums Earned	55,057	49,803	106,516	97,663
Segment Profit	8,864	5,405	14,207	10,641
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	8,864	5,405	14,207	10,641
Operating Segments [Member] | Reinsurance [Member]
Segment Reporting Information [Line Items]
Direct and Assumed Premium Written	9,272	12,074	21,102	25,776
Net Premiums Earned	7,848	11,972	20,231	25,210
Segment Profit	(786)	2,910	1,102	7,679
Reconciliation from segment totals to consolidated [Abstract]
Segment profit	(786)	2,910	1,102	7,679
Segment Reconciling Items [Member]
Reconciliation from segment totals to consolidated [Abstract]
Net investment income	2,090	1,985	4,383	4,395
Net gains on investments	8,089	719	12,159	15,066
Corporate expenses	$ (4,220)	$ (3,757)	$ (8,375)	$ (7,840)