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Income Taxes (Summary of Operating Loss Carryforwards) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward $ 1,481us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
Operating Loss Expires In 2021 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 325us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2021Member
Operating Loss Expires In 2022 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 878us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2022Member
Operating Loss Expires In 2028 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 2us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2028Member
Operating Loss Expires In 2030 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 25us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2030Member
Operating Loss Expires In 2031 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 45us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2031Member
Operating Loss Expires In 2032 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 77us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2032Member
Operating Loss Expires In 2033 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 73us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2033Member
Operating Loss Expires In 2034 [Member]  
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward $ 56us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_StatementScenarioAxis
= hall_OperatingLossExpiresIn2034Member