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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2017	Dec. 31, 2015
Goodwill [Line Items]
Goodwill		$ 53,777	$ 53,777	$ 53,777		$ 40,231
Core deposit intangibles		1,878	2,572
Intangible assets, accumulated amortization		1,874	1,180
Amortization of core deposit intangibles		695	$ 455	$ 234
Folsom Lake Bank
Goodwill [Line Items]
Goodwill		13,466			$ 13,466
Sierra Vista Bank
Goodwill [Line Items]
Goodwill		10,394
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		3 years
Core deposits \| Folsom Lake Bank
Goodwill [Line Items]
Acquired finite-lived intangible assets		$ 1,879
Acquired finite-lived intangible assets useful life	5 years
Core deposits \| Sierra Vista Bank
Goodwill [Line Items]
Acquired finite-lived intangible assets		508
Core deposits \| Visalia Community Bank
Goodwill [Line Items]
Acquired finite-lived intangible assets		$ 1,365
Minimum \| Core deposits
Goodwill [Line Items]
Estimated useful life of intangible asset		5 years
Maximum \| Core deposits
Goodwill [Line Items]
Estimated useful life of intangible asset		10 years