According to the Washington Post, up to 100 million Capital One consumer and business credit card applicants may have had their data stolen by a hacker, including Social Security and bank account information.

The Post reported the bank became aware of the breach after the hacker bragged about the theft online. The FBI subsequently arrested Paige A. Thompson, a Seattle-are woman, linking her to the posts.

The Post added the bank expects the cost of the breach to the company will be around $100 million to $150 million in the short term.