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Acquisitions - Proforma Results of Operations (Details) - Sierra Vista Bank and Folsom Lake Bank [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Net interest income $ 61,059 $ 56,531
Provision for (reversal of) credit losses (1,150) (5,800)
Non-interest income 11,240 10,205
Non-interest expense 51,415 52,131
Income before provision for income taxes 22,034 20,405
Provision for income taxes 9,168 6,381
Net income 12,866 14,024
Net income available to common shareholders $ 12,866 $ 14,024
Basic earnings per common share (in dollars per share) $ 1.03 $ 1.24
Diluted earnings per common share (in dollars per share) $ 1.01 $ 1.23