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ACQUISITION OF WASHINGTONFIRST BANKSHARES INC (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
shares
Dec. 31, 2017
USD ($)
Number_Of_Offices
Dec. 29, 2017
$ / shares
Business Acquisition [Line Items]          
Transaction value, business combination $ 446,650        
Share Price | $ / shares         $ 39.02
Number of shares issued by the company, pursuant to WashingtonFirst acquisition | shares     11,446,197    
Assets acquired 2,098,656     $ 2,100,000  
(Decrease) in goodwill from re-measurement period adjustment   $ 3,400      
Provisional amount of goodwill recognized $ 259,654        
WashingtonFirst Bankshares Inc [Member]          
Business Acquisition [Line Items]          
Number of Banking Offices | Number_Of_Offices       19  
The combined company [Member] | Sandy Spring Shareholders [Member]          
Business Acquisition [Line Items]          
Percentage of voting interests acquired, combined co. 67.70%        
The combined company [Member] | WashingtonFirst Shareholders [Member]          
Business Acquisition [Line Items]          
Percentage of voting interests acquired, combined co. 32.30%