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Equity Plan (Details)
3 Months Ended
Mar. 31, 2015
2013 Plan  
Equity plan  
Number of shares available for future grants 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= htbk_EquityIncentivePlan2013Member
Options  
Equity plan  
Vesting period 4 years
Options | Maximum  
Equity plan  
Expiration term 10 years
Restricted stock  
Equity plan  
Number of equity awards issued (in shares) 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Nonqualified stock options  
Equity plan  
Number of equity awards issued (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= htbk_NonqualifiedStockOptionsMember