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Acquisitions - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) branch shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 53,777,000 |  | $ 53,777,000 |  | $ 53,777,000
Acquisition and integration |  | $ 0 | $ 455,000 | $ 217,000 | $ 455,000 |
Folsom Lake Bank |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 28,475,000 |  |  |  |  |
Equity interest issued (in shares) | shares | 1,276,888 |  |  |  |  |
Total assets | $ 196,148,000 |  |  |  |  |
Goodwill | 13,466,000 |  |  |  |  |
Intangible assets other than goodwill | $ 1,879,000 |  |  |  |  |
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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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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