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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
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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

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