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Segment Information (Schedule of Segment Reporting Additional Information by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets $ 980,869us-gaap_Assets $ 909,023us-gaap_Assets
Standard Commercial Segment [Member]    
Assets 145,355us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_StandardCommercialSegmentMember		 142,143us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_StandardCommercialSegmentMember
Specialty Commercial Segment [Member]    
Assets 590,852us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_SpecailtyCommercialSegmentMember		 536,894us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_SpecailtyCommercialSegmentMember
Personal Segment [Member]    
Assets 222,183us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_PersonalSegmentMember		 210,825us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hall_PersonalSegmentMember
Corporate [Member]    
Assets 22,479us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 19,161us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Parent Company [Member]    
Assets $ 342,255us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 $ 329,017us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember