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Segment Information (Schedule of Additional Business Segment Information) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Assets $ 1,017,674us-gaap_Assets $ 980,869us-gaap_Assets
Standard Commercial Segment [Member]    
Segment Reporting Information [Line Items]    
Assets 148,854us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_StandardCommercialSegmentMember		 145,355us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_StandardCommercialSegmentMember
Specialty Commercial Segment [Member]    
Segment Reporting Information [Line Items]    
Assets 614,900us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_SpecialtyCommercialSegmentMember		 590,852us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_SpecialtyCommercialSegmentMember
Personal Segment [Member]    
Segment Reporting Information [Line Items]    
Assets 233,562us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_PersonalSegmentMember		 222,183us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_PersonalSegmentMember
Corporate [Member]    
Segment Reporting Information [Line Items]    
Assets $ 20,358us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ 22,479us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember