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MERGERS AND ACQUISITIONS AND BRANCH CONSOLIDATIONS - Narrative (Details)
$ / shares in Units, ft² in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
May 01, 2019
USD ($)
shares
Oct. 01, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
loanProductionOffice
branchLocation
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Oct. 31, 2019
ft²
branchLocation
Apr. 30, 2019
$ / shares
Sep. 28, 2018
$ / shares
Business Acquisition [Line Items]                  
Shares of common stock issued for acquisition (in shares) | shares         1,765,704 1,052,635      
Closing stock price per share (in shares) | $ / shares               $ 20.74 $ 23.80
Goodwill     $ 19,925 $ 18,724 $ 19,925 $ 12,592      
Unaudited pro forma net income         20,900        
Pro forma revenue         102,500        
Merger related expenses       $ 1,310 8,964 $ 3,197      
Number of bank branch locations | branchLocation       6          
Number of loan production offices | loanProductionOffice       3          
Consolidation of operations expenses     988 $ 1,600          
Fixed asset writedowns     762            
Lease termination costs     126 $ 1,300          
Severance and other     100            
Assets Held-for-sale     $ 4,900   4,900        
Pennsylvania Branch Locations                  
Business Acquisition [Line Items]                  
Number of bank branch locations | branchLocation             5    
Area of Real Estate Property | ft²             50    
Mercersburg Financial Corporation                  
Business Acquisition [Line Items]                  
Percentage of interests acquired   100.00%              
Cash paid   $ 4,900              
Consideration paid   29,900              
Assets acquired excluding goodwill   181,400              
Loans acquired   141,100              
Securities available for sale   7,400              
Total liabilities assumed   163,400              
Deposits   160,400              
Goodwill   $ 11,900              
Merger related expenses         280        
Mercersburg Financial Corporation | Investment Banking, Legal And Consulting Fees                  
Business Acquisition [Line Items]                  
Merger related expenses         81        
Mercersburg Financial Corporation | Information Systems                  
Business Acquisition [Line Items]                  
Merger related expenses         199        
Mercersburg Financial Corporation | Common Stock                  
Business Acquisition [Line Items]                  
Shares of common stock issued for acquisition (in shares) | shares   1,052,635              
Hamilton Bancorp, Inc.                  
Business Acquisition [Line Items]                  
Percentage of interests acquired 100.00%                
Cash paid $ 14,197                
Consideration paid 50,819                
Assets acquired excluding goodwill 494,000                
Loans acquired 347,143                
Securities available for sale 60,882                
Total liabilities assumed 449,358                
Deposits 388,246                
Goodwill 6,132                
Core deposit intangible 4,550                
Merger related expenses         7,700        
Hamilton Bancorp, Inc. | Investment Banking, Legal And Consulting Fees                  
Business Acquisition [Line Items]                  
Merger related expenses         1,900        
Hamilton Bancorp, Inc. | Information Systems                  
Business Acquisition [Line Items]                  
Merger related expenses         3,700        
Hamilton Bancorp, Inc. | Other Expenses                  
Business Acquisition [Line Items]                  
Merger related expenses         $ 2,200        
Hamilton Bancorp, Inc. | Core deposit intangibles                  
Business Acquisition [Line Items]                  
Core deposit intangible $ 4,600                
Amortization Period 10 years                
Hamilton Bancorp, Inc. | Common Stock                  
Business Acquisition [Line Items]                  
Shares of common stock issued for acquisition (in shares) | shares 1,765,704