August 25, 2017 - Page 2 of 2

Northside Hospital and Gwinnett Health System Reach Agreement on Combining Operations

August 25, 2017

ATLANTA – Northside Hospital and Gwinnett Health System (the parent of Gwinnett Medical Center) announced that they have submitted their
proposed merger agreement to the State of Georgia Office of the Attorney General for review and approval. Depending on the review process, the five hospital Northside-Gwinnett Health combined system could be operational in early 2018.

Lynn Harton named CEO of United Community Bank | Jimmy Tallent to Remain Chairman and CEO of Holding Company

August 25, 2017

BLAIRSVILLE — The board of directors of United Community Banks, Inc. (NASDAQ: UCBI) today announced that Lynn Harton has been named chief executive officer of United Community Bank (the “Bank”), UCBI’s banking subsidiary. Mr. Harton will continue to serve as president of UCBI and the Bank, as well as a member of their respective boards.