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Acquisition of Sierra Vista Bank - Narrative (Details) shares in Thousands, $ in Thousands		3 Months Ended
	Oct. 01, 2016 USD ($) branch shares	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 40,311	$ 40,231
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
Folsom, California | Sierra Vista Bank
Business Acquisition [Line Items]
Number of branches to be acquired | branch	1
Fair Oaks, California | Sierra Vista Bank
Business Acquisition [Line Items]
Number of branches to be acquired | branch	1
Cameron Park, California | Sierra Vista Bank
Business Acquisition [Line Items]
Number of branches to be acquired | branch	1
Core deposits
Business Acquisition [Line Items]
Acquired finite-lived intangible assets useful life		10 years
Increase to goodwill measurement adjustment		$ 80

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