KBC Bank Ireland has reported a net profit of €4.4m - after taxes and impairments - for the three months from July to September.
This compares with a net profit of €33.6m the same time last year.
Today's profit figure was hit by an €18m charge relating to the Central Bank's tracker mortgage examination, with KBC setting aside €14m for a potential fine.
More than 3,700 KBC customer accounts were impacted by the tracker issue.
In today's results statement, KBC said its customer numbers increased in the third quarter as it added 22,000 new accounts.
The bank said this brings the total number of new customer accounts added in 2019 to over 60,000.
It also reported new mortgage lending of €800m, a year on year increase of 21% compared to 2018 and outperforming market growth of 11%.
KBC Bank Ireland also reduced its impaired loans during the three month period by 8% to €1.7 billion.
Peter Roebben, chief executive of KBC Bank Ireland, said that KBC continued its journey to further develop and build a bank that offers innovative and competitive banking services and solutions in Ireland.
"As today's results show, our strong 2019 performance continues, with consistent growth in new mortgage lending and current accounts," Mr Roebben said.
"This quarter, we added 22,000 more customer accounts and reached a milestone for our business by surpassing 300,000 customers who now bank with us. This growth shows that people are actively seeking out KBC as their alternative banking choice," he added.
The bank's Belgian parent company KBC Group also announced quarterly results this morning as it reported a profit of €612m, down from €701m the same time last year.
Meanwhile, KBC Group's CEO Johan Thijs said today that the Central Bank needs to move on as an "annoying" inquiry into a mortgage overcharging controversy hampers growth.