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Acquisition of First Priority Financial Corp. (Narrative) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 08, 2018
Business Acquisition [Line Items]          
Goodwill   $ 62,840,000 $ 3,918,000    
Amortization expense   1,224,000 104,000 $ 126,000  
First Priority Financial Corp. [Member]          
Business Acquisition [Line Items]          
Acquisition completion date Jul. 31, 2018        
Shares of acquirer ratio of common stock 34.81%        
Per share price $ 11.07        
Common stock shares issued to acquire the company 2,320,800        
Business combination, consideration transferred, equity interests issued and issuable $ 76,122,000        
Payments to acquire businesses gross 3,807,000        
Business combination consideration transferred 79,929,000        
Goodwill 39,744,000        
Intangible assets acquired (finite lived) 2,832,000        
Intangible assets acquired (indefinite lived) $ 205,000        
Intangible assets, amortization period 10 years        
Core deposit intangible amortization expense related to acquisition for year one $ 493,000        
Core deposit intangible amortization expense related to acquisition for year two 442,000        
Core deposit intangible amortization expense related to acquisition for year three 390,000        
Core deposit intangible amortization expense related to acquisition for year four 339,000        
Core deposit intangible amortization expense related to acquisition for year five 288,000        
Core deposit intangible amortization expense related to acquisition for four years after year five 665,000        
Fair value of purchased loans $ 511,623,000       $ 511,623,000
Pro forma earnings   15,469,000 $ 9,170,000    
Severance and retention bonus expenses   1,475,000      
First Priority Financial Corp. [Member] | Excluded Acquisition-related Costs [Member]          
Business Acquisition [Line Items]          
Pro forma earnings   3,486,000      
Income tax nondeductible expenses   714,000      
First Priority Financial Corp. [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Amortization expense   $ 215,000      
First Priority Financial Corp. [Member] | Series D [Member]          
Business Acquisition [Line Items]          
Preferred Stock, Shares Issued 3,404        
Preferred stock, value $ 3,404,000        
First Priority Financial Corp. [Member] | Stock Options [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses gross 3,801,000        
First Priority Financial Corp. [Member] | Fractional Shares [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses gross $ 6,000        
First Priority Financial Corp. [Member] | Common Stock [Member]          
Business Acquisition [Line Items]          
Per share price $ 32.80        
Business combination, consideration transferred, equity interests issued and issuable $ 76,122,000