Banking on the campground wifi is perfectly safe as long as you know you're making the proper connection (not connecting to a look alike) and have an https connection to your bank/credit card/brokerage.
The greater threat is someone hacking the central servers of those places, or if you really want to get paranoid, the server at your local restaurant getting your credit card info.
Joe, Mary and Dakota, the wacko cat
Fulltiming since 2006
2006 Dodge 3500 QC CTD SRW Jacobs Exhaust brake
2017 Open Range 3X388RKS, side porch