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Acquisition - Narrative (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Nov. 29, 2013
USD ($)
branch
Business Acquisition [Line Items]          
Goodwill   $ 6,436,000 $ 6,436,000    
Impairment on goodwill   0 0    
Impairment loss on core deposit intangible asset   0 0    
Future amortization expense:          
Total   3,113,000 3,732,000    
Business Acquisition, Pro Forma Information [Abstract]          
Interest income included in acquired operations   67,187,000 70,441,000 $ 58,775,000  
Interest expense included in acquired operations   2,251,000 2,349,000 1,785,000  
Non-interest income included in acquired operations   9,193,000 9,041,000 8,066,000  
Non-interest expense included in acquired operations   46,949,000 47,263,000 44,092,000  
Income before income taxes included in acquired operations   $ 28,931,000 31,469,000 $ 22,209,000  
NorCal Community Bancorp          
Business Acquisition [Line Items]          
Loans acquired         $ 173,800,000
Deposits acquired         241,000,000
Investment securities         $ 53,700,000
Number of branches | branch         4
Goodwill         $ 6,400,000
Period core deposit is amortized for income tax purposes   10 years      
Future amortization expense:          
2016   $ 533,000      
2017   472,000      
2018   413,000      
2019   388,000      
2020   365,000      
Thereafter   942,000      
Total   3,113,000      
Business Acquisition, Pro Forma Information [Abstract]          
Interest income included in acquired operations $ 1,100,000        
Interest expense included in acquired operations 68,000        
Non-interest income included in acquired operations 95,000        
Non-interest expense included in acquired operations 1,100,000        
Income before income taxes included in acquired operations 109,000        
Core Deposits | NorCal Community Bancorp          
Business Acquisition [Line Items]          
Core deposit intangible asset         $ 4,600,000
Amount of core deposit intangible asset amortized $ 69,000 $ 619,000 $ 771,000