Customers of 88 Bank of Ireland branches are using its local services for the last time today.
The closures were announced last March as part of the banks downsizing plan and shift towards an online service.
Some of the banks services, such as cash withdrawals and lodgments, will now be available through the post office network instead.
Customers affected by the closures have been written to in recent months to inform them of the changes and where their accounts will be transferred to.