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Acquisition of First Priority Financial Corp. (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Mar. 31, 2019
Business Acquisition [Line Items]        
Goodwill     $ 62,840,000 $ 62,840,000
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      
Fair value of purchased loans $ 511,623,000      
Pro forma earnings   $ 2,278,000    
First Priority Financial Corp. [Member] | Excluded Acquisition-related Costs [Member]        
Business Acquisition [Line Items]        
Pro forma earnings     420,000  
Income tax nondeductible expenses     $ 284,000  
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