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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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