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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 01, 2017	Oct. 01, 2016	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 53,777	$ 40,231	$ 29,917			$ 29,917
Core deposit intangibles	3,027	1,383
Intangible assets, accumulated amortization	725	490
Amortization of core deposit intangibles	234	$ 149	$ 320
Folsom Lake Bank
Goodwill [Line Items]
Goodwill	13,466			$ 13,466
Sierra Vista Bank
Goodwill [Line Items]
Goodwill	10,394				$ 10,314
Measurement adjustment, increase to goodwill	80
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	8 years
Core deposits | Folsom Lake Bank
Goodwill [Line Items]
Acquired finite-lived intangible assets	$ 1,879
Acquired finite-lived intangible assets useful life	10 years
Core deposits | Sierra Vista Bank
Goodwill [Line Items]
Acquired finite-lived intangible assets	$ 508
Acquired finite-lived intangible assets useful life	10 years
Core deposits | Visalia Community Bank
Goodwill [Line Items]
Acquired finite-lived intangible assets	$ 1,365
Maximum | Core deposits
Goodwill [Line Items]
Estimated useful life of intangible asset	10 years

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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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.

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