NCR Corp. (NCR) has agreed to purchase Menlo, Calif.-based Digital Insight Corporation for $1.65 billion. The deal follows Intuit's sale of the mobile and online banking unit to private equity firm Thoma Bravo LLC in August.

Digital Insight counts more than 1,000 financial institutions with 12 million online banking users and nearly 4.8 million mobile end users as customers. NCR said the acquisition will let the Duluth, Ga., company offer its clients additional solutions for mobile, bill pay and online banking.

Separately, NCR also completed a purchase of Alaric Systems in London for $84 million. Alaric provides secure transaction switching and fraud prevention software and powers more than 1.25 billion transactions a month across 30 countries.

The companies will complement NCR's existing capabilities to form an enterprise platform for the banking industry, said NCR in a release.

"Today, we are fundamentally and permanently changing our largest line of business, financial services," said NCR chairman and CEO Bill Nuti in a press release. "With the announcements of our agreement to purchase Digital Insight and our acquisition of Alaric Systems, NCR becomes a powerful, global fintech solutions provider enabling retail banks to deliver on the promise of omni-channel capabilities — on top of an unparalleled, innovative software platform."