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PENDING AQUISITION (Details) - Scenario, Plan [Member] - Maryland-based Revere [Member]
$ / shares in Units, $ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Banks
Sep. 30, 2019
USD ($)
Sep. 23, 2019
$ / shares
shares
Pending acquisition [Line Items]      
Business acquisition rate of share exchange | shares     1.05
Transaction value   $ 460.7  
Closing price | $ / shares     $ 35.33
Number of Banking Offices | Banks 11    
Assets acquired $ 2,600.0    
Sandy Spring Shareholders [Member]      
Pending acquisition [Line Items]      
Percentage of combined company owned     74.00%
Revere shareholders [Member]      
Pending acquisition [Line Items]      
Percentage of combined company owned     26.00%