Texas-based BancorpSouth Bank will merge with FNS Bancshares in a $108.4 million deal, BancorpSouth announced Wednesday. FNS Bancshares, based in Scottsboro and founded in 1900, is the parent company of FNB Bank. FNB was the 18th-ranked bank in Alabama in total assets in 2019, and as of Sept. 30, FNS reported total assets of $786.5…