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Acquisitions - Proforma Results of Operations (Details) - Sierra Vista Bank and Folsom Lake Bank [Member]
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Net interest income $ 61,059
Provision for (reversal of) credit losses (1,150)
Non-interest income 11,240
Non-interest expense 51,415
Income before provision for income taxes 22,034
Provision for income taxes 9,168
Net income 12,866
Net income available to common shareholders $ 12,866
Basic earnings per common share (in dollars per share) | $ / shares $ 1.03
Diluted earnings per common share (in dollars per share) | $ / shares $ 1.01