Nick Fahy is optimistic about Ireland’s banking sector. The three pillar banks have dominated the industry since KBC and Ulster Bank pulled out of the country in 2023. But now the retail banking sector is set for its most consequential year since. Spain’s Bankinter is in the process of transforming its Irish subsidiary into a full-fledged bank while Revolut readies a mortgage product and London fintech Monzo prepares to enter the market for the first time. For Fahy, a former Bank of Ireland veteran who now runs UK SME lender Cynergy Bank, these are positive signs. “I think there is…