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Acquisitions - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) branch shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 53,777 |  | $ 53,777 |  | $ 53,777
Acquisition and integration |  | $ 0 | $ 163 | $ 217 | $ 618 |
Folsom Lake Bank |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 28,475 |  |  |  |  |
Equity interest issued (in shares) | shares | 1,276,888 |  |  |  |  |
Total assets | $ 196,148 |  |  |  |  |
Goodwill | 13,466 |  |  |  |  |
Intangible assets other than goodwill | $ 1,879 |  |  |  |  |
Folsom Lake Bank | Folsom, and Rancho Cordova, California |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches acquired | branch | 2 |  |  |  |  |
Folsom Lake Bank | Core deposits |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets useful life |  | 10 years |  |  |  |

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