Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Business Acquisition, Pro Forma Information) (Details)

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ACQUISITIONS (Business Acquisition, Pro Forma Information) (Details) - Access National Bank - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Total revenues $ 681,306 $ 666,921 $ 468,840
Net income $ 217,075 $ 185,698 $ 91,270
Earnings per share (in dollars per share) $ 2.53 $ 2.28 $ 1.59