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Equity Plan - General Disclosures (Details) - USD ($)
12 Months Ended
Oct. 11, 2019
Dec. 31, 2020
Dec. 31, 2019
Equity Plan      
Number of shares available for future grants   2,409,062  
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options     $ 7,426,000
Presidio bank      
Equity Plan      
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options $ 7,426,000 $ 7,426,000  
Options      
Equity Plan      
Vesting period   4 years  
Expiration term   10 years  
Heritage Commerce Corp stock options   2,546,821 2,712,846
Options | Presidio bank      
Equity Plan      
Heritage Commerce Corp stock options   1,176,757  
Restricted stock      
Equity Plan      
Number of equity awards issued (in shares)   168,117  
Nonqualified stock options      
Equity Plan      
Number of equity awards issued (in shares)   329,500