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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 01, 2017 | Oct. 01, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 53,777 | $ 53,777 | $ 40,231 |  |  | $ 29,917
Core deposit intangibles |  | 2,572 | 3,027 |  |  |  |
Intangible assets, accumulated amortization |  | 1,180 | 725 |  |  |  |
Amortization of core deposit intangibles |  | 455 | $ 234 | $ 149 |  |  |
Folsom Lake Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 13,466 |  |  | $ 13,466 |  |
Sierra Vista Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 10,394 |  |  |  | $ 10,314 |
Visalia Community Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 6,340 |  |  |  |  |
Service 1st Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 14,643 |  |  |  |  |
Bank of Madera County |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 8,934 |  |  |  |  |
Core deposits |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Acquired finite-lived intangible assets useful life |  | 4 years |  |  |  |  |
Core deposits | Folsom Lake Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Acquired finite-lived intangible assets |  | $ 1,879 |  |  |  |  |
Acquired finite-lived intangible assets useful life | 5 years |  |  |  |  |  |
Core deposits | Sierra Vista Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Acquired finite-lived intangible assets |  | $ 508 |  |  |  |  |
Acquired finite-lived intangible assets useful life |  | 5 years |  |  |  |  |
Core deposits | Visalia Community Bank |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Acquired finite-lived intangible assets |  | $ 1,365 |  |  |  |  |
Minimum | Core deposits |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Estimated useful life of intangible asset |  | 5 years |  |  |  |  |
Maximum | Core deposits |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Estimated useful life of intangible asset |  | 10 years |  |  |  |  |

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