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Equity Plan - General Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 11, 2019
Dec. 31, 2019
Dec. 31, 2018
Equity Plan      
Number of shares available for future grants   796,957  
Presidio bank      
Equity Plan      
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options $ 7,426 $ 7,426  
Options      
Equity Plan      
Vesting period   4 years  
Expiration term   10 years  
Heritage Commerce Corp stock options   2,712,846 1,570,603
Options | Presidio bank      
Equity Plan      
Heritage Commerce Corp stock options   1,176,757  
Restricted stock      
Equity Plan      
Number of equity awards issued (in shares)   134,653  
Nonqualified stock options      
Equity Plan      
Number of equity awards issued (in shares)   299,500