The corporate parent of First National Bank, the Pittsburgh-based company that recently acquired Raleigh’s Yadkin Bank, has made a major statement about its commitment to the region with its announcement that it will anchor a new 22-story tower that will be built in downtown Raleigh. The building at 501 Fayetteville St., along City Plaza, is being developed for FNB Corp.’s regional headquarters by Raleigh’s Dominion Realty Partners. “We love to see more headquarters coming downtown,” said Raleigh Mayor Nancy McFarlane. “It really speaks to all the investments we have made, how much people enjoy working and living downtown.”