The lender announced a few hours later that the problems had been resolved.
"Sorry to all of our customers for the inconvenience today," the bank wrote on its Facebook page late Friday. "Our mobile and online banking platforms are coming back up. We will continue to monitor throughout the night to make sure you get the service you expect from us and that you deserve."
The bank urged customers who were charged fees as a result of the problem to contact it.
Earlier Friday, spokesman Thaddeus Herrick did not elaborate on what might have caused the problems.
BBVA Compass is the U.S. division of Banco Bilbao Vizcaya Argentaria SA, Spain's second-largest bank.