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Acquisition of Sierra Vista Bank - Narrative (Details) shares in Thousands, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 01, 2016 USD ($) branch shares | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 40,311 | $ 40,231
Sierra Vista Bank |  |  |
Business Acquisition [Line Items] |  |  |
Total assets | $ 155,154 |  |
Estimated number of shares to be issued in merger transaction | shares | 1,059 |  |
Cash | $ 9,469 |  |
Goodwill | 10,314 |  |
Core deposit intangible | $ 508 |  |
Folsom, California | Sierra Vista Bank |  |  |
Business Acquisition [Line Items] |  |  |
Number of branches to be acquired | branch | 1 |  |
Fair Oaks, California | Sierra Vista Bank |  |  |
Business Acquisition [Line Items] |  |  |
Number of branches to be acquired | branch | 1 |  |
Cameron Park, California | Sierra Vista Bank |  |  |
Business Acquisition [Line Items] |  |  |
Number of branches to be acquired | branch | 1 |  |
Core deposits |  |  |
Business Acquisition [Line Items] |  |  |
Acquired finite-lived intangible assets useful life |  | 10 years |
Increase to goodwill measurement adjustment |  | $ 80 |

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