First Horizon has been paying dividends in the form of stock since 10/1/08. This is also called a "payment in kind" dividend. For help computing your new cost basis and the gain/loss on cash in lieu of fractional shares, go to costbasis (dot) com and click on stock split calculators for a free calculator and database. You will find it very useful.
The stock split was payable on July 1, but you may have gotten credit for the new shares on the date it went ex-dividend, June 10. That's when the custodian of my shares credited me with the stock split shares.