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Acquisitions - Narrative (Details) $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 01, 2017 USD ($) branch shares	Oct. 01, 2016 USD ($) branch shares	Sep. 30, 2018	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 53,777	$ 53,777	$ 40,231	$ 29,917
Acquisition and integration expenses				$ 217	$ 1,828	$ 1,782
Core deposits
Business Acquisition [Line Items]
Acquired finite-lived intangible assets useful life				4 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
Total assets acquired	$ 196,148
Goodwill	13,466			$ 13,466
Core deposit intangible	1,879
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			5 years
Folsom Lake Bank | Folsom, and Rancho Cordova, California [Member]
Business Acquisition [Line Items]
Number of branches to be acquired | branch	2
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
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				5 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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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.

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