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Equity Plan - General Disclosures (Details) - USD ($)
3 Months Ended
Oct. 11, 2019
Mar. 31, 2020
Dec. 31, 2019
May 25, 2017
May 24, 2017
Equity Plan          
Number of shares available for future grants   803,739      
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      
2013 Plan          
Equity Plan          
Number of shares authorized for equity plan       3,000,000 1,750,000
Options          
Equity Plan          
Vesting period   4 years      
Expiration term   10 years      
Heritage Commerce Corp stock options   2,505,523 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)   0      
Nonqualified stock options          
Equity Plan          
Number of equity awards issued (in shares)   25,000