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Acquisition of New Windsor Bancorp, Inc. - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2017
USD ($)
director
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]            
Merger expenses   $ 208 $ 0 $ 370 $ 0  
New Windsor            
Business Acquisition [Line Items]            
Pro forma total assets   1,600,000   1,600,000    
Pro forma total deposits   1,300,000   1,300,000    
Pro forma loans   1,200,000   1,200,000    
Merger expenses   $ 208   370   $ 472
Merger-related expenses       $ 170    
Subsequent Event | New Windsor            
Business Acquisition [Line Items]            
Cash each shareholder may receive per share (in dollars per share) | $ / shares $ 30.00          
Percent of consideration paid as cash 15.00%          
Cash paid in merger $ 4,520          
Number of directors joining boards | director 2          
Subsequent Event | New Windsor | Common Stock            
Business Acquisition [Line Items]            
Number of shares each shareholder may receive (in shares) | shares 1.10          
Percent of consideration paid as common stock 85.00%          
Shares of common stock issued in merger (in shares) | shares 950,000