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Acquisitions - Narrative (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 01, 2017 USD ($) branch shares	Sep. 30, 2019	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 53,777	$ 53,777	$ 53,777	$ 40,231
Acquisition and integration expenses			$ 0	$ 217	$ 1,828
Core deposits
Business Acquisition [Line Items]
Acquired finite-lived intangible assets useful life			3 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]
Goodwill			$ 10,394

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