The data was sold and traded before 000webhost was alerted in October.
The trove of digital documents that could have been accessed included private information, such as Social Security numbers and bank accounts.
Data breaches and hacks have become facts of life in the 21st century. The bank said Monday that a hacker gained access to more than 100 million of its customers' personal information.
The breach potentially compromises people's Social Security numbers, bank account numbers, addresses, credit scores and limits, among other data.
Swinger website Adult Friend Finder said in 2016 that as many as 412 million users had their personal information exposed — the company'ssecond hack in a year.
Equifax disclosed in 2017 that personal information of as many as 143 million people was compromised.