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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | At December 31, 2017, the future estimated amortization expense for the CDI arising from our past acquisitions is as follows:
(in thousands) | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total |
Core deposit intangible amortization | $ | 921 |  | $ | 887 |  | $ | 853 |  | $ | 818 |  | $ | 782 |  | $ | 2,231 |  | $ | 6,492 |
At December 31, 2017, the future estimated amortization expense on the CDI from the Bank of Napa acquisition is as follows:
(in thousands) | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total |
Core deposit intangible amortization | $ | 508 |  | $ | 499 |  | $ | 488 |  | $ | 475 |  | $ | 460 |  | $ | 1,955 |  | $ | 4,385 |
Schedule of Earnings Per Share Reconciliation | The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options, unvested restricted stock awards and stock warrant, and 3) weighted average diluted shares. Basic EPS are calculated by dividing net income by the weighted average number of common shares outstanding during each annual period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. In computing diluted EPS, we exclude anti-dilutive shares such as options whose exercise prices exceed the current common stock price as they would not reduce EPS under the treasury method. We have two forms of our outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Under the two-class method, the difference in EPS is nominal for these participating securities.
(in thousands, except per share data) | 2017 |  | 2016 |  | 2015 |
Weighted average basic shares outstanding | 6,196 |  | 6,073 |  | 5,966 |
Potentially dilutive common shares related to: |  |  |
Stock options | 62 |  | 34 |  | 41 |
Unvested restricted stock awards | 15 |  | 8 |  | 5 |
Warrant | — |  | — |  | 53 |
Weighted average diluted shares outstanding | 6,273 |  | 6,115 |  | 6,065 |
Net income | $ | 15,976 |  | $ | 23,134 |  | $ | 18,441 |
Basic EPS | $ | 2.58 |  | $ | 3.81 |  | $ | 3.09 |
Diluted EPS | $ | 2.55 |  | $ | 3.78 |  | $ | 3.04 |
Weighted average anti-dilutive shares not included in the calculation of diluted EPS | 21 |  | 64 |  | 36 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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