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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 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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