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Fair Value (Details 2) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Impaired loans held-for-investment    
Impaired loans held-for-investment $ 6,896,000htbk_FairValueImpairedFinancingReceivableRecordedInvestment $ 6,022,000htbk_FairValueImpairedFinancingReceivableRecordedInvestment
Specific valuation allowance (533,000)htbk_FairValueImpairedFinancingReceivableRelatedAllowance (404,000)htbk_FairValueImpairedFinancingReceivableRelatedAllowance
Carried at fair value    
Impaired loans held-for-investment    
Impaired loans held-for-investment 6,041,000htbk_FairValueImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtFairValueFairValueDisclosureMember		 3,026,000htbk_FairValueImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtFairValueFairValueDisclosureMember
Carried at cost    
Impaired loans held-for-investment    
Impaired loans held-for-investment 855,000htbk_FairValueImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember		 2,996,000htbk_FairValueImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Estimated Fair Value    
Impaired loans held-for-investment    
Impaired loans held-for-investment carried at fair value, net $ 5,508,000htbk_ImpairedFinancingReceivableHeldForInvestmentFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 2,622,000htbk_ImpairedFinancingReceivableHeldForInvestmentFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember