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Share-Based Payment Arrangements (Narrative) (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 10, 2013
Jul. 27, 2012
Mar. 31, 2014
Jun. 30, 2013
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 01, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 164,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                  
Compensation costs expected to be recognized during remainder of the fiscal period 123,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfNextTwelveMonths                  
Compensation costs expected to be recognized during next fiscal year 41,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNextTwelveMonths                  
Stock options, granted                     
Long Term Incentive Plan 2005 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock compensation plan, number of shares authorized 2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Number of incentive stock options to purchase shares of common stock outstanding 683,810hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveStockOptionsToPurchaseNumberOfShares
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Number of non-qualified stock options to purchase shares of common stock outstanding 304,157hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonQualifiedStockOptionsToPurchaseNumberOfShares
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Number of restricted stock units to receive shares of common stock 312,099hall_NumberOfRestrictedStockUnitsToReceiveSharesOfCommonStock
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Share-based compensation by share based payment award, remaining available shares for issuance 520,293hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingNumberOfSharesToBeIssued
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | First Anniversary [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of options vested or expected to vest 10.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPeriodOneMember
                 
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Second Anniversary [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of options vested or expected to vest 20.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPeriodTwoMember
                 
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Third Anniversary [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of options vested or expected to vest 30.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPeriodThreeMember
                 
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Fourth Anniversary [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of options vested or expected to vest 40.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPeriodFourMember
                 
Long Term Incentive Plan 2005 [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Incentive stock options termination period 5 years                  
Long Term Incentive Plan 2005 [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Incentive stock options termination period 10 years                  
Incentive Stock Options 2009 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Incentive stock options termination period 10 years                  
Share-based payment, award vesting period 7 years                  
Incentive Stock Options 2010 [Member] | 25,000 Grant [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Incentive stock options termination period 10 years                  
Share-based payment, award vesting period 3 years                  
Number of options vested or expected to vest 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= hall_IncentiveStockOptions2010Member
/ us-gaap_StatementScenarioAxis
= hall_ScenarioTwoMember
                 
Incentive Stock Options 2011 [Member] | 5,000 Grant [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Incentive stock options termination period 10 years                  
Share-based payment, award vesting period 7 years                  
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of options vested or expected to vest 100.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ us-gaap_AwardTypeAxis
= hall_NonQualifiedStockOptionsMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Incentive stock options termination period 10 years                  
Incentive Non Qualified Stock Options 2009 [Member] | 200,000 Grant [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Incentive stock options termination period 10 years                  
Share-based payment, award vesting period 7 years                  
Number of options vested or expected to vest 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= hall_IncentiveNonQualifiedStockOptions2009Member
/ us-gaap_StatementScenarioAxis
= hall_ScenarioThreeMember
                 
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total unrecognized compensation cost related to non-vested share-based compensation arrangements 1,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Compensation costs expected to be recognized during remainder of the fiscal period 400,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfNextTwelveMonths
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Compensation costs expected to be recognized during next fiscal year 400,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNextTwelveMonths
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Compensation costs expected to be recognized during year two 200,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Compensation costs expected to be recognized during year three 35,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Other than options, granted    122,823us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
129,463us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
    175,983us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
       
Other than options, forfeited 68,534us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
      9,280us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
         
Vested (8,616)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
                 
Other than options, grant date fair value             $ 9.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
$ 9.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
$ 9.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
 
Allocated share-based compensation expense 332,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
    62,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
           
Income tax benefit of share-based payments recognized in income $ 116,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
    $ 22,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
           
Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued of vested units                   8,616us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember