The Royal Bank of Scotland has issued an apology after customers were left unable to access their money.
Customers at RBS and subsidiary NatWest began reporting problems with cash withdrawals and debit card payments at about 22:00 GMT on 6 March.
The fault also affected online and mobile banking services.
According to RBS all systems had returned to normal by 01:00 GMT on 7 March.
This is second time that RBS customers have experienced problems with payments.
In June 2012, RBS, NatWest and Ulster Bank had to extend opening hours at their branches to assist customers who had been unable to pay bills, move money or whose salaries had not been paid.
That problem was reportedly caused by an update to the software used for processing payments.
A spokesperson for the RBS group said: "We are disappointed that our customers have faced disruption to banking services for a period this evening, and apologise for that. All services are now running as normal again.
"If any customers are having continued difficulties please call on 0845 7242424 if an RBS customer or 0845 7888 444 if a NatWest customer so we can resolve their issues."
Ulster Bank, part of the RBS group, also apologised to customers.