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Stockholders' Equity and Stock Plans - Options Outstanding Rollforward (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Options outstanding, beginning balance (in shares) 517,936 363,578  
Granted (in shares) 74,096 201,328  
Cancelled, expired or forfeited (in shares) (9,140) (4,022)  
Exercised (in shares) (157,192) (42,948)  
Options outstanding, ending balance (in shares) 425,700 517,936 363,578
Exercisable (vested), ending balance (in shares) 311,050 384,344  
Weighted Average Exercise Price      
Options outstanding, beginning balance (usd per share) $ 20.42 $ 20.60  
Granted (usd per share) 33.97 19.89  
Cancelled, expired or forfeited (usd per share) 28.25 21.99  
Exercised (usd per share) 13.93 19.31  
Options outstanding, ending balance (usd per share) 25.01 20.42 $ 20.60
Exercisable (vested), ending balance (usd per share) $ 22.57 $ 17.85  
Aggregate Intrinsic Value      
Options outstanding, beginning balance $ 7,075 $ 5,190  
Exercised 3,462 585  
Options outstanding, ending balance 6,910 7,075 $ 5,190
Exercisable (vested) at year end $ 5,809 $ 6,212  
Weighted Average Grant-Date Fair Value      
Granted (usd per share) $ 7.17 $ 16.31  
Weighted Average Remaining Contractual Term      
Options outstanding 5 years 10 months 6 days 5 years 4 months 2 days 5 years 9 months 7 days
Exercisable (vested) 4 years 11 months 8 days 4 years 5 months 1 day  
Bank of Napa, N.A. (Napa)      
Weighted Average Exercise Price      
Options outstanding, beginning balance (usd per share) $ 13.60    
Options outstanding, ending balance (usd per share)   $ 13.60  
Weighted Average Grant-Date Fair Value      
Granted (usd per share)   $ 20.36  
Weighted Average Remaining Contractual Term      
Number of options issued in merger   140,290