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Segment Information (Narrative) (Details)
 12 Months Ended
Dec. 31, 2014
American Hallmark Insurance Company [Member]  
Net premiums written, percentage 30.00%hall_NetPremiumsWrittenPercentage
/ dei_LegalEntityAxis
= hall_AmericanHallmarkInsuranceCompanyMember
Hallmark Insurance Company (Payer) [Member]  
Net premiums written, percentage 27.00%hall_NetPremiumsWrittenPercentage
/ dei_LegalEntityAxis
= hall_HallmarkInsuranceCompanyMember
Hallmark Specialty Insurance Company [Member]  
Net premiums written, percentage 30.00%hall_NetPremiumsWrittenPercentage
/ dei_LegalEntityAxis
= hall_HallmarkSpecialtyInsuranceCompanyMember
Hallmark National Insurance Company [Member]  
Net premiums written, percentage 13.00%hall_NetPremiumsWrittenPercentage
/ dei_LegalEntityAxis
= hall_HallmarkNationalInsuranceCompanyMember