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ACQUISITION OF REVERE BANK - Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
USD ($)
bank
Dec. 31, 2020
USD ($)
$ / shares
Apr. 01, 2020
USD ($)
$ / shares
shares
Business Acquisition [Line Items]      
Closing price (in dollars per share) | $ / shares   $ 22.64  
Consideration transferred   $ 293,002  
Assets acquired   2,846,356  
Provisional amount of goodwill recognized   $ 515 $ 800
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
Consideration transferred $ 293,000    
Assets acquired $ 2,800,000    
Number of banking offices | bank 11