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Share-based Payment Arrangements (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended 6 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 10, 2013
Jul. 12, 2012
Jun. 30, 2013
Sep. 30, 2014
May 26, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost $ 200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized              
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Not Yet Recognized Next Twelve Months 200,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNextTwelveMonths              
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Two 44,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearTwo              
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Three 3,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearThree              
Stock options, Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod          
Options contractual term 3 years 3 months 18 days              
Long Term Incentive Plan 2005 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, number of shares authorized               2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
Share-based compensation arrangement by share-based payment award, incentive stock options to purchase number of shares 757,977hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveStockOptionsToPurchaseNumberOfShares
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Share-based compensation arrangement by share-based payment award, non-qualified stock options to purchase number of shares 304,157hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonQualifiedStockOptionsToPurchaseNumberOfShares
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Share-based compensation arrangement by share-based payment award, restricted stock options to purchase number of shares 427,824hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsToPurchaseNumberOfShares
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Share-based compensation by share-based payment award, remaining available shares for issuance 358,850hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingNumberOfSharesToBeIssued
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Share-based compensation arrangement by share based payment award options vested and expected to vest number 100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Non qualified stock options termination period 10 years              
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]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage 10.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPercentageFirstAnniversaryMember
             
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]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage 20.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPercentageSecondAnniversaryMember
             
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]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage 30.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPercentageThirdAnniversaryMember
             
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]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage 40.00%hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentage
/ hall_OptionIssuancePeriodTypeAxis
= hall_OptionIssuedPriorTo2009Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_VestingAxis
= hall_VestingPercentageFourthAnniversaryMember
             
Incentive Stock Options 2010 [Member] | Long Term Incentive Plan 2005 [Member] | 25,000 Grant [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation arrangement by share based payment award options vested and expected to vest number 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= hall_IncentiveStockOptions2010Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_StatementScenarioAxis
= hall_ScenarioTwoMember
             
Share-based compensation arrangement by share-based payment award, award vesting period 3 years              
Stock Based Compensation Incentive Stock Options Grant Under Incentive Plan Termination Period 10 years              
Incentive Stock Options 2011 [Member] | Long Term Incentive Plan 2005 [Member] | 5,000 Grant [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation arrangement by share based payment award options vested and expected to vest number 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= hall_IncentiveStockOptions2011Member
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
/ us-gaap_StatementScenarioAxis
= hall_ScenarioOneMember
             
Share-based compensation arrangement by share-based payment award, award vesting period 7 years              
Stock Based Compensation Incentive Stock Options Grant Under Incentive Plan Termination Period 10 years              
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, non-qualified stock options to purchase number of shares 200,000hall_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonQualifiedStockOptionsToPurchaseNumberOfShares
/ us-gaap_AwardTypeAxis
= hall_NonQualifiedStockOptionsMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Share-based compensation arrangement by share-based payment award, award vesting period 7 years              
Stock Based Compensation Incentive Stock Options Grant Under Incentive Plan Termination Period 10 years              
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Other than options granted, weighted average grant date fair value $ 9.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
9.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
9.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Allocated share-based compensation expense 49,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
145,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Income tax benefit of share-based payments recognized in income 17,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
51,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of restricted stock units granted as result of meeting growth rates 50.00%hall_PercentageOfRestrictedStockUnitsGrantedAsResultOfMeetingGrowthRates
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
             
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of restricted stock units granted as result of meeting growth rates 150.00%hall_PercentageOfRestrictedStockUnitsGrantedAsResultOfMeetingGrowthRates
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
             
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost 900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Not Yet Recognized Next Twelve Months 400,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNextTwelveMonths
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Two 300,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Three 200,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Four $ 32,000hall_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostExpectedToRecognizeDuringRemainderOfYearFour
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
             
Other than options, granted 175,983us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= hall_LongTermIncentivePlan2005Member
    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 127,618us-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