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Stockholders' Equity and Stock Plans - Options Outstanding Rollforward (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 21, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares          
Options outstanding, beginning balance (in shares)   181,789 185,269 194,672  
Granted (in shares)   100,664 32,637 28,320  
Cancelled, expired or forfeited (in shares)   (2,011)   (652)  
Exercised (in shares)   (21,474) (36,117) (37,071)  
Options outstanding, ending balance (in shares)   258,968 181,789 185,269 194,672
Exercisable (vested), ending balance (in shares)   192,172 103,211 114,581  
Weighted Average Exercise Price          
Options outstanding, beginning balance (usd per share)   $ 41.20 $ 38.35 $ 35.14  
Granted (usd per share)   39.78 49.37 50.70  
Cancelled, expired or forfeited (usd per share)   43.97   48.38  
Exercised (usd per share)   38.62 33.98 30.72  
Options outstanding, ending balance (usd per share)   40.84 41.20 38.35 $ 35.14
Exercisable (vested), ending balance (usd per share)   35.69 36.65 34.12  
Weighted Average Grant-Date Fair Value          
Granted (usd per share)   $ 32.61 $ 10.11 $ 12.21  
Weighted Average Remaining Contractual Term          
Options outstanding   5 years 4 months 2 days 5 years 9 months 7 days 5 years 4 years 5 months 23 days
Exercisable (vested)   4 years 5 months 1 day 4 years 2 months 4 days 3 years 2 months 15 days  
Aggregate Intrinsic Value          
Options outstanding, beginning balance   $ 5,190 $ 2,788 $ 3,398  
Exercised   585 661 755  
Options outstanding, ending balance   7,075 5,190 2,788 $ 3,398
Exercisable (vested) at year end   $ 6,212 $ 3,416 $ 2,209  
Bank of Napa, N.A. (Napa)          
Business Acquisition [Line Items]          
Number of options issued in merger 70,145 70,145      
Weighted Average Exercise Price          
Options outstanding, ending balance (usd per share)   $ 27.20      
Weighted Average Grant-Date Fair Value          
Granted (usd per share)   $ 40.71