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Retirement Plans (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets $ 11,290,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 10,851,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 9,754,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 9,019,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Defined benefit plan, fair value of plan assets, excluding cash and cash equivalents 10,948,000hall_DefinedBenefitPlanFairValueOfPlanAssetsExcludingCashAndCashEquivalents 10,528,000hall_DefinedBenefitPlanFairValueOfPlanAssetsExcludingCashAndCashEquivalents    
Favorable rate of return equal to or greater than average inflation rate 5.00%hall_FavorableRateOfReturnEqualToOrGreaterThanAverageInflationRate      
Investment objective achievement period 60 years      
Single stock issue restricted among total portfolio value 5.00%hall_SingleStockIssueRestrictedAmongTotalPortfolioValue      
Securities held in mutual or commingled funds 90.00%hall_SecuritiesHeldInMutualOrCommingledFunds      
Expected return on plan assets 6.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 6.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 6.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets  
Net periodic pension cost (4,000)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 385,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 462,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost  
Interest cost on projected benefit obligation 532,000us-gaap_DefinedBenefitPlanInterestCost 505,000us-gaap_DefinedBenefitPlanInterestCost 564,000us-gaap_DefinedBenefitPlanInterestCost  
Defined benefit plan, expected return on plan assets (698,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (615,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (584,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets  
Defined contribution plan, number of separate plans 2hall_DefinedContributionPlanNumberOfSeparatePlans      
Defined contribution plan, employer discretionary contribution amount 300,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 300,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 100,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount  
Scenario, Forecast for 2015 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension cost (100,000)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		      
Interest cost on projected benefit obligation 500,000us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		      
Defined benefit plan, expected return on plan assets (700,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		      
Defined benefit plan, amortization of losses (gains) 100,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		      
Cash and Cash Equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 400,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember		 300,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember		    
Bonds and Notes [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 3,700,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hall_BondsAndNotesMember		      
Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 7,200,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		      
Defined benefit plan, fair value of plan assets, excluding cash and cash equivalents $ 7,230,000hall_DefinedBenefitPlanFairValueOfPlanAssetsExcludingCashAndCashEquivalents
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		 $ 7,080,000hall_DefinedBenefitPlanFairValueOfPlanAssetsExcludingCashAndCashEquivalents
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		    
Defined benefit plan, target plan asset allocations range, minimum 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		      
Defined benefit plan, target plan asset allocations range, maximum 75.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		      
Standard Commercial P & C Business Unit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Minimum hours of service to participate within defined benefit plan 1000 hours