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Acquisitions - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 27, 2017 USD ($) $ / shares | Oct. 01, 2016 USD ($) branch shares | Jun. 30, 2017 USD ($) branch | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 40,311 | $ 40,231
Combined pro forma assets |  |  | $ 1,444,836 | $ 1,443,323
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 |  |
Estimated number of shares to be issued in merger transaction | shares |  | 1,059 |  |
Cash |  | $ 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 to be acquired | branch |  | 1 |  |
Sierra Vista Bank | Fair Oaks, California |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches to be acquired | branch |  | 1 |  |
Sierra Vista Bank | Cameron Park, California |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches to be acquired | branch |  | 1 |  |
Folsom Lake Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches to be acquired | branch |  |  | 3 |
Total assets |  |  | $ 205,900 |
Business combination consideration | $ 33,600 |  |  |
Stock exchange ratio | 0.80 |  |  |
Share price (in dollars per share) | $ / shares | $ 17.95 |  |  |
Folsom Lake Bank [Member] | Pro Forma |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Combined pro forma assets |  |  | $ 1,700,000 |

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