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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) | Common Stock Tri Valley Bank | Common Stock United American Bank | Common Stock Presidio bank | Common Stock | Retained Earnings Adjustment | Retained Earnings | Accumulated Other Comprehensive Income / (Loss) | Tri Valley Bank | United American Bank | Presidio bank | Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  |  |  | $ 218,355,000 |  | $ 62,136,000 | $ (9,252,000) |  |  |  |  | $ 271,239,000
Balance (in shares) at Dec. 31, 2017 |  |  |  | 38,200,883 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 35,331,000 |  |  |  |  |  | 35,331,000
Other comprehensive income (loss) |  |  |  |  |  |  | (3,129,000) |  |  |  |  | (3,129,000)
Issuance of common shares to acquire Business | $ 30,725,000 | $ 47,280,000 |  |  |  |  |  | $ 30,725,000 | $ 47,280,000 |  |  |
Issuance of common shares to acquire Business (in shares) | 1,889,613 | 2,826,032 |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock awards, net (in shares) |  |  |  | 95,378 |  |  |  |  |  |  |  |
Amortization of restricted stock awards, net of forfeitures and taxes |  |  |  | $ 1,109,000 |  |  |  |  |  |  |  | 1,109,000
Cash dividend declared |  |  |  |  |  | (18,464,000) |  |  |  |  |  | (18,464,000)
Stock option expense, net of forfeitures |  |  |  | 708,000 |  |  |  |  |  |  |  | 708,000
Stock options exercised |  |  |  | $ 2,667,000 |  |  |  |  |  |  |  | 2,667,000
Stock options exercised (in shares) |  |  |  | 276,844 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 |  |  |  | $ 300,844,000 |  | 79,003,000 | (12,381,000) |  |  |  |  | 367,466,000
Balance (in shares) at Dec. 31, 2018 |  |  |  | 43,288,750 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 40,461,000 |  |  |  |  |  | 40,461,000
Other comprehensive income (loss) |  |  |  |  |  |  | 2,603,000 |  |  |  |  | 2,603,000
Issuance of common shares to acquire Business |  |  | $ 177,926,000 |  |  |  |  |  |  | $ 177,926,000 |  |
Issuance of common shares to acquire Business (in shares) |  |  | 15,684,064 |  |  |  |  |  |  |  |  |
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options |  |  |  | $ 7,426,000 |  |  |  |  |  |  |  | 7,426,000
Issuance of restricted stock awards, net (in shares) |  |  |  | 128,653 |  |  |  |  |  |  |  |
Amortization of restricted stock awards, net of forfeitures and taxes |  |  |  | $ 1,283,000 |  |  |  |  |  |  |  | 1,283,000
Cash dividend declared |  |  |  |  |  | (22,723,000) |  |  |  |  |  | (22,723,000)
Stock option expense, net of forfeitures |  |  |  | 640,000 |  |  |  |  |  |  |  | 640,000
Stock options exercised |  |  |  | $ 1,626,000 |  |  |  |  |  |  |  | 1,626,000
Stock options exercised (in shares) |  |  |  | 266,689 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 |  |  |  | $ 489,745,000 | $ (6,062,000) | 96,741,000 | (9,778,000) |  |  |  | $ (6,062,000) | 576,708,000
Balance (in shares) at Dec. 31, 2019 |  |  |  | 59,368,156 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 35,299,000 |  |  |  |  |  | 35,299,000
Other comprehensive income (loss) |  |  |  |  |  |  | (939,000) |  |  |  |  | (939,000)
Consideration for Presidio stock options exchanged for Heritage Commerce Corp stock options |  |  |  |  |  |  |  |  |  | $ 7,426,000 |  |
Issuance of restricted stock awards, net (in shares) |  |  |  | 168,117 |  |  |  |  |  |  |  |
Amortization of restricted stock awards, net of forfeitures and taxes |  |  |  | $ 1,689,000 |  |  |  |  |  |  |  | 1,689,000
Cash dividend declared |  |  |  |  |  | (31,079,000) |  |  |  |  |  | (31,079,000)
Stock option expense, net of forfeitures and taxes |  |  |  | 559,000 |  |  |  |  |  |  |  | 559,000
Stock options exercised |  |  |  | $ 1,714,000 |  |  |  |  |  |  |  | 1,714,000
Stock options exercised (in shares) |  |  |  | 381,184 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2020 |  |  |  | $ 493,707,000 |  | $ 94,899,000 | $ (10,717,000) |  |  |  |  | $ 577,889,000
Balance (in shares) at Dec. 31, 2020 |  |  |  | 59,917,457 |  |  |  |  |  |  |  |

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