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Acquisition of First Priority Financial Corp. (Narrative) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 62,840,000 $ 62,840,000  
Amortization expense   1,430,000 1,224,000 $ 104,000
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 $ 442,000      
Core deposit intangible amortization expense related to acquisition for year two 390,000      
Core deposit intangible amortization expense related to acquisition for year three 339,000      
Core deposit intangible amortization expense related to acquisition for year four 288,000      
Core deposit intangible amortization expense related to acquisition for year five 236,000      
Core deposit intangible amortization expense related to acquisition for four years after year five 429,000      
Fair value of purchased loans $ 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   $ 493,000 $ 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