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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
Dec. 31, 2015
Business Acquisition [Line Items]      
Net interest income $ 61,059 $ 56,531 $ 52,413
Provision for (reversal of) credit losses (1,150) (5,800) 570
Non-interest income 11,240 10,205 10,063
Non-interest expense 51,415 52,131 45,692
Income before provision for income taxes 22,034 20,405 16,214
Provision for income taxes 9,168 6,381 3,669
Net income 12,866 14,024 12,545
Net income available to common shareholders $ 12,866 $ 14,024 $ 12,545
Basic earnings per common share (in dollars per share) $ 1.03 $ 1.24 $ 1.15
Diluted earnings per common share (in dollars per share) $ 1.01 $ 1.23 $ 1.14