We had something similar happen about a year ago, shortly after we acquired 4 branches of another Bank. TONS of people from outside our defined market area attempted to open accounts through the phone, web, mail, etc. because they saw the acquisition as a potential move to be made before a company would go public. They figured that by having a deposit relationship with us, they would be aware of any initial offerings made by the company to stakeholders. Since you're already public, I'm wondering if maybe he thinks you're either set for a big move yourself, or he knows of someone who's looking to buy you? Don't sleep on the younger folks being investors, I got into it at the age of 20!
Life is like a bicycle. To keep your balance, you must keep moving.