M&T Bank completed its acquisition of People’s United Bank on April 1, more than a year after the banks announced the deal.

Buffalo-based M&T Bank Corp. said in a statement Saturday that it had completed the acquisition of People’s United Financial in a deal valued at $8.3 billion. People’s United’s common stock stopped trading on the NASDAQ after the close of business on Friday.

The combined company has more than 22,000 employees and a network of over 1,000 branches in 12 states from Maine to Virginia and Washington, D.C., M&T said in the statement. René Jones, M&T’s chairman and CEO, will lead the combined company.

“Today marks an important day in M&T’s history as we welcome People’s United to our family,” Jones said in the statement. “People’s United is a strong strategic and cultural fit and I am truly excited about the positive impact our combined company will have in the communities we serve. Together, we have the capabilities and scale of a regional bank with the engagement model of a community-based organization to help us better serve new and existing customers, businesses and communities.”

Massachusetts has more than 60 People’s United branches that will become M&T’s first retail branches in the state, but the new names will not appear on branches yet. M&T said People’s United’s customers will continue to use current branches, websites, mobile apps, financial advisors and relationship managers until the full brand and system conversion, which M&T expects to occur in the third quarter.

“The acquisition accelerates M&T’s growth trajectory and strengthens the company’s financial profile for continued success,” the bank said in a statement. “M&T will build on People’s United’s complementary footprint to reach a broad range of customers and expand into new regions. The franchise will operate across some of the most populated and attractive banking markets in the U.S.”

M&T is keeping People’s United’s headquarters in Bridgeport, Connecticut, as its New England regional headquarters.

The banks had announced the deal on Feb. 22, 2021, but did not receive regulatory approval until March 4 of this year. People’s United had about $64 billion in assets as of Dec. 31, and the combined institution will have about $215 billion in assets.

As part of the merger, M&T Bank had developed a five-year community benefits plan with the National Community Reinvestment Coalition and local community organizations. That plan will provide loans, investments and other financial support for low-to-moderate families and neighborhoods across the combined M&T and People’s United footprint, the bank said in the statement.