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Business Combinations (Details) - USD ($)
3 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Mar. 31, 2018
United Financial      
Business Acquisition [Line Items]      
Aggregate transaction consideration   $ 0  
Aggregate cash consideration   0  
TriSummit Bancorp      
Business Acquisition [Line Items]      
Merger expenses   220,000  
Merger expenses estimated in the future   $ 5,300,000  
TriSummit Bancorp | Subsequent Event      
Business Acquisition [Line Items]      
Aggregate transaction consideration $ 36,127,000    
Aggregate cash consideration $ 16,083,000    
Business Combination, Number Of Shares Converted, Net Of Cancellations 86,185    
Shares issued for acquisition 765,277    
TriSummit Bancorp | Subsequent Event | Common Stock      
Business Acquisition [Line Items]      
Right to receive cash (in dollars per share) $ 4.40    
Number of securities called by each share of TriSummit (in shares) 0.2099    
TriSummit Bancorp | Subsequent Event | Series A Preferred Stock      
Business Acquisition [Line Items]      
Right to receive cash (in dollars per share) $ 4.40    
Number of securities called by each share of TriSummit (in shares) 0.2099    
TriSummit Bancorp | TriSummit Bancorp | Subsequent Event      
Business Acquisition [Line Items]      
Percentage of outstanding options canceled 50.00%    
TriSummit Bancorp | TriSummit Bancorp | Subsequent Event | Series B, C, and D TARP Preferred Stock      
Business Acquisition [Line Items]      
Value of redeemed preferred stock $ 7,140,000    
Scenario, Forecast | United Financial      
Business Acquisition [Line Items]      
Aggregate cash consideration     $ 225