Danske Bank is to close two branches in Larne and Ballynahinch this year, it announced on Friday.
The number of Danske Bank's in Northern Ireland will be reduced to 42 when the branches shut on October 12.
Richard Caldwell, Danske Bank’s managing director of personal banking and small business, said: “The way customers use branches has changed significantly in recent years.
"Many are now choosing to use different ways to bank with us, such as digital or telephone banking. As a business, we must respond to these changes, therefore priorities for investment will adapt and change.”
He added: “We do not take such decisions lightly. I have written to customers of the branches involved to assure them that we remain committed to continuing to meet their banking needs and to inform them about the many different ways to bank with us.
"Over the coming weeks we will be organising support sessions for any customers needing further guidance. If any of our customers are concerned, I would encourage them to speak to us - we will do everything we can to help them.”