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ACQUISITION OF REVERE BANK - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
bank
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Apr. 01, 2020
USD ($)
$ / shares
shares
Business Acquisition [Line Items]        
Total transaction value   $ 293,002    
Assets   2,846,356    
Provisional amount of goodwill recognized   $ 515   $ 800
Subsequent Event | Forecast        
Business Acquisition [Line Items]        
Provisional amount of goodwill recognized     $ 500  
Sandy Spring Shareholders        
Business Acquisition [Line Items]        
Percentage of ownership in combined company       74.00%
Revere shareholders        
Business Acquisition [Line Items]        
Percentage of ownership in combined company       26.00%
Maryland-based Revere        
Business Acquisition [Line Items]        
Business acquisition rate of share exchange (in shares) | shares       1.05
Closing price (in dollars per share) | $ / shares       $ 22.64
Total transaction value $ 293,000      
Assets $ 2,800,000      
Number of banking offices | bank 11