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Acquisitions - Narrative (Details) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) branch shares | Oct. 01, 2016 USD ($) branch shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Deposit on acquisition of bank |  |  | $ 0 | $ 9,470 |
Goodwill |  |  | $ 40,311 |  | $ 40,231
Core deposits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets useful life |  |  | 10 years |  |
Sierra Vista Bank |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total assets |  | $ 155,154 |  |  |
Equity interest issued (in shares) | shares |  | 1,059,000 |  |  |
Deposit on acquisition of bank |  | $ 9,469 |  |  |
Goodwill |  | 10,314 |  |  |
Core deposit intangible |  | $ 508 |  |  |
Increase to goodwill measurement adjustment |  |  | $ 80 |  |
Sierra Vista Bank | Folsom, California |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch |  | 1 |  |  |
Sierra Vista Bank | Fair Oaks, California |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch |  | 1 |  |  |
Sierra Vista Bank | Cameron Park, California |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch |  | 1 |  |  |
Folsom Lake Bank | Subsequent Event [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch | 3 |  |  |  |
Total assets | $ 197,300 |  |  |  |
Equity interest issued (in shares) | shares | 1,276,888 |  |  |  |
Consideration transferred | $ 28,500 |  |  |  |

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