The merger between First Financial Bancorp. and MainSource Financial Group has been completed, officials announced today.

While MainSource officially became part of First Financial Bank on Sunday, the MainSource banking centers will continue to operate under the name MainSource Bank until conversion of the operating systems. During the conversion weekend, slated for May 25-28, MainSource banking centers along with the client relationships and all accounts will convert to First Financial Bank. All MainSource banking centers will be closed on Saturday May 26 for purposes of the transition.

The banking centers will reopen under the First Financial brand on Tuesday, May 29 and clients will have access to a network of approximately 150 banking centers and over 55,000 ATMs. Prior to the conversion, clients will receive a welcome guide detailing the transition and the benefits of being a First Financial client.

Read more details in Tuesday’s print edition of The Republic.