Wells Fargo and Citigroup have room to buy a big bank. These 5 regionals fit the bill

Charles Scharf, chief executive officer of Wells Fargo & Co., and Jane Fraser, chief executive officer of Citigroup Inc.Caroline Brehman | Qilai Shen | Bloomberg | Getty ImagesWalk the halls of any major banking conference or listen in on a quarterly earnings call, and one topic keeps coming up: With the window for mergers wide open under the Trump administration, who will take a swing?After years on the sidelines because of regulatory restrictions, large banks can once again contemplate buying other lenders, even a $100 billion-plus-asset regional bank.While JPMorgan Chase and Bank of America are barred from such a deal because they already have more than 10% of national deposits, there are two megabanks that could pursue a large acquisition: Citigroup and Wells Fargo. The nation's third- and fourth-largest banks have enough room under the national deposits cap to pursue a hefty regional bank, according to investment bankers, consultants and investors."Two years ago, it was impossible for a bank of that size to get approval to acquire almost anything," said Brian Graham, co-founder of advisory firm Klaros. "Now, it's possible they can get a deal done. I'd be shocked if they ar...