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Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Segment
Mar. 31, 2012
Reportable Segments [Abstract]    
Number of reportable segments 2  
Segment Reporting Information [Line Items]    
Direct and Assumed Premium Written $ 83,891 $ 90,053
Net Premiums Earned 61,098 61,551
Segment Profit 10,004 13,070
Reconciliation from segment totals to consolidated [Abstract]    
Segment profit 10,004 13,070
Net investment income 2,410 2,422
Net gains on investments 14,347 5,381
Corporate expenses (4,082) (3,874)
Income before federal income taxes 22,679 16,999
Property and Casualty Insurance [Member]
   
Segment Reporting Information [Line Items]    
Direct and Assumed Premium Written 70,189 75,226
Net Premiums Earned 47,860 47,909
Segment Profit 5,234 6,933
Reconciliation from segment totals to consolidated [Abstract]    
Segment profit 5,234 6,933
Reinsurance [Member]
   
Segment Reporting Information [Line Items]    
Direct and Assumed Premium Written 13,702 14,827
Net Premiums Earned 13,238 13,642
Segment Profit 4,770 6,137
Reconciliation from segment totals to consolidated [Abstract]    
Segment profit $ 4,770 $ 6,137