The U.S. Securities and Exchange Commission and the United States Attorney's Office for the Northern District of Georgia are investigating Ameris Bancorp's handling of a troubled acquisition that began in 2016, probing what the bank disclosed to its investors. Investigators have subpoenaed documents and other materials relating to Ameris's acquisition of US Premium Finance Holding Company, its sale of certain loans to a related company and disclosures about the deal, which closed in 2018. Ameris...