First Financial Bancorp completed the conversion of MainSource Financial Group into First Financial as the final step of the merger of the two companies. The systems, locations and branding were combined over Memorial Day weekend.

The acquisition increased First Financial’s total asset size from $8.9 billion to approximately $14 billion and makes it the fourth largest bank ranked in deposits in its headquarter market of Cincinnati.

“We open our doors today as a stronger organization with an increased depth of products, services, talent and size to compete in a rapidly evolving industry,” said Archie Brown, CEO of First Financial Bank. “Most importantly, we have combined our great teams to better serve our clients, both now and in the future.”

“This is a significant day in our company’s history,” said Claude Davis, First Financial executive chairman. “It’s something we’ve worked toward during the course of my time here, and it marks the beginning of an exciting new chapter for our bank. I’m proud of all we have accomplished, and look forward to continuing our trajectory of growth.”