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Acquisitions - Narrative (Details) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) branch shares | Oct. 01, 2016 USD ($) branch shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 53,777 | $ 40,231 | $ 29,917 | $ 29,917
Acquisition and integration expenses |  |  |  |  | $ 0 |
Core deposits |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets useful life |  |  | 8 years |  |  |
Folsom Lake Bank |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 28,475 |  |  |  |  |
Estimated number of shares to be issued in merger transaction (in shares) | shares | 1,276,888 |  |  |  |  |
Number of branches to be acquired | branch | 2 |  |  |  |  |
Total assets acquired | $ 196,148 |  |  |  |  |
Goodwill | 13,466 |  | $ 13,466 |  |  |
Core deposit intangible | 1,879 |  |  |  |  |
Acquisition and integration expenses |  |  | $ 1,828 |  |  |
Non-impaired loans | 117,815 |  |  |  |  |
Customer receivables | $ 121,872 |  |  |  |  |
Folsom Lake Bank | Core deposits |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets useful life |  |  | 10 years |  |  |
Sierra Vista Bank |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  | $ 26,261 |  |  |  |
Estimated number of shares to be issued in merger transaction (in shares) | shares |  | 1,058,851 |  |  |  |
Total assets acquired |  | $ 155,154 |  |  |  |
Goodwill |  | 10,314 | $ 10,394 |  |  |
Core deposit intangible |  | 508 |  |  |  |
Acquisition and integration expenses |  |  |  | $ 1,782 |  |
Cash |  | 9,468 |  |  |  |
Non-impaired loans |  | 121,902 |  |  |  |
Customer receivables |  | 124,396 |  |  |  |
Core deposit intangible |  | $ 508 |  |  |  |
Sierra Vista Bank | Core deposits |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets useful life |  |  | 10 years |  |  |
Sierra Vista Bank | Folsom, California [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches to be acquired | branch |  | 1 |  |  |  |
Sierra Vista Bank | Fair Oaks, California [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches to be acquired | branch |  | 1 |  |  |  |
Sierra Vista Bank | Cameron Park, California [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches to be acquired | branch |  | 1 |  |  |  |

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- Definition Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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