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Subsequent Events (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
Jan. 16, 2018
Jan. 08, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Scottdale's assets prior to merger     $ 1,170,354,000 $ 1,032,599,000
Scottdale's deposits prior to merger     1,023,568,000 $ 935,373,000
Scottdale Bank and Trust Company [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Date of acquisition   Jan. 08, 2018    
Plan of merger agreement, date   Mar. 29, 2017    
Per share price   $ 1,166    
Merger agreement exchange ratio   3888.00%    
Common stock shares issued to acquire the company   1.9    
Cash paid to acquire the business   $ 2,800,000    
Business acquisition, transaction cost   $ 66,972,000    
Period prior to closing of merger for calculating average price   8 days    
First Priority Financial Corp. [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Plan of merger agreement, date Jan. 16, 2018      
Business acquisition, proforma assets $ 2,000,000,000      
Shares of acquirer ratio of common stock 34.81%      
Scottdale Bank and Trust Company [Member]        
Subsequent Event [Line Items]        
Scottdale's assets prior to merger     260,735,000  
Scottdale's loans prior to merger     69,328,000  
Scottdale's deposits prior to merger     $ 210,658,000