XML 51 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1
ACQUISITION OF WASHINGTONFIRST BANKSHARES INC (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Number_Of_Offices
shares
Jan. 01, 2018
Dec. 27, 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 $ 2,101,171    
Provisional amount of goodwill recognized $ 257,139    
WashingtonFirst Bankshares Inc [Member]      
Business Acquisition [Line Items]      
Number of Banking Offices | Number_Of_Offices 19    
WashingtonFirst Bankshares Inc [Member] | Sandy Spring Shareholders [Member]      
Business Acquisition [Line Items]      
Percentage of voting interests acquired, combined co.   67.70%  
WashingtonFirst Bankshares Inc [Member] | WashingtonFirst Shareholders [Member]      
Business Acquisition [Line Items]      
Percentage of voting interests acquired, combined co.   32.30%