The OCC or the FDIC would have been the likely regulator options.
Until something suspect happens or the money is known to be illegally acquired, I’m not sure what restrictions there are on cash infusions from investors.
I will say I am blown away with any bank under the multi-billions of dollars in assets having a person with a “chief digital officer” title.
The bank had a state charter, so the OCC would not be involved. It was the FDIC, although the new ownership group switched Federal regulator from the FDIC to the Federal Reserve.