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Business combinations - Presidio (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 11, 2019 USD ($) $ / shares shares | Oct. 31, 2019 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 19, 2019 USD ($) | Dec. 31, 2018 USD ($)
Assets acquired: |  |  |  |  |  |
Securities available-for-sale |  |  |  | $ 45,069,000 |  | $ 63,723,000
Securities held-to-maturity |  |  |  | 463,000 |  |
Loans |  |  |  | 685,964,000 |  | 336,446,000
Premises and equipment |  |  |  | 1,756,000 |  | 350,000
Other assets, net |  |  |  | 29,397,000 |  | 14,736,000
Subordinate debt |  |  | $ 39,740,000 | 39,554,000 |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  |  |  | 774,259,000 |  | 416,628,000
Subordinate debt |  |  | 39,740,000 | 39,554,000 |  |
Other borrowings |  |  |  | 442,000 |  | 62,000
Other liabilities |  |  |  | 18,127,000 |  | 3,038,000
Goodwill recorded in the merger |  |  | 167,631,000 | 167,420,000 |  | $ 83,753,000
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options |  |  |  | $ 7,426,000 |  |
Presidio bank |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  | 117,988,000 |  |  |
Securities available-for-sale |  |  | 45,069,000 |  |  |
Securities held-to-maturity |  |  | 463,000 |  |  |
Loans |  |  | 685,964,000 |  |  |
Premises and equipment |  |  | 1,756,000 |  |  |
Other intangible assets |  |  | 11,147,000 |  |  |
Other assets, net |  |  | 42,161,000 |  |  |
Total assets acquired |  |  | 904,548,000 |  |  |
Amortized intangible assets |  | 60 months |  |  |  |
Subordinate debt |  |  | 10,000,000 |  | $ 10,000,000 |
Liabilities assumed: |  |  |  |  |  |
Deposits |  |  | 774,259,000 |  |  |
Subordinate debt |  |  | 10,000,000 |  | $ 10,000,000 |
Other borrowings |  |  | 442,000 |  |  |
Other liabilities |  |  | 18,127,000 |  |  |
Total liabilities assumed |  |  | 802,828,000 |  |  |
Net assets acquired |  |  | 101,720,000 |  |  |
Purchase price |  |  | 185,598,000 |  |  |
Goodwill recorded in the merger |  |  | 83,878,000 |  |  |
Aggregate transaction value | $ 185,598,000 |  |  |  |  |
Fixed exchange ratio |  |  |  | 2.47 |  |
Issuance of shares of common stock to Presidio shareholders | shares | 15,684,064 |  |  |  |  |
Issuance of shares of common stock to holders of restricted stock | $ 178,171,000 |  |  |  |  |
Stock price at Closing (in dollars per share) | $ / shares | $ 11.36 |  |  |  |  |
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options | $ 7,426,000 |  | 7,426,000 |  |  |
Cash paid for fractional shares | $ 1,000 |  |  |  |  |
Presidio bank | Below or Above market-value lease |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Amortized intangible assets | 60 months |  |  |  |  |
Previously Reported | Presidio bank |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  | 117,989,000 |  |  |
Securities available-for-sale |  |  | 44,647,000 |  |  |
Securities held-to-maturity |  |  | 463,000 |  |  |
Loans |  |  | 698,493,000 |  |  |
Allowance for loan losses |  |  | (7,463,000) |  |  |
Premises and equipment |  |  | 1,756,000 |  |  |
Other assets, net |  |  | 43,539,000 |  |  |
Total assets acquired |  |  | 899,424,000 |  |  |
Subordinate debt |  |  | 10,000,000 |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  |  | 774,260,000 |  |  |
Subordinate debt |  |  | 10,000,000 |  |  |
Other borrowings |  |  | 442,000 |  |  |
Other liabilities |  |  | 17,916,000 |  |  |
Total liabilities assumed |  |  | 802,618,000 |  |  |
Fair Value Adjustments | Presidio bank |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  | (1,000) |  |  |
Securities available-for-sale |  |  | 422,000 |  |  |
Loans |  |  | (12,529,000) |  |  |
Allowance for loan losses |  |  | 7,463,000 |  |  |
Other intangible assets |  |  | 11,147,000 |  |  |
Other assets, net |  |  | (1,378,000) |  |  |
Total assets acquired |  |  | 5,124,000 |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  |  | (1,000) |  |  |
Other liabilities |  |  | 211,000 |  |  |
Total liabilities assumed |  |  | $ 210,000 |  |  |

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