First Financial Bancorp. provided net interest margin guidance for the first quarter 2018 and effective tax rate guidance for full year 2018. The company expects the first quarter net interest margin to be between 3.7% and 3.75% on a fully tax equivalent basis, reflecting more normalized loan fee and interest recapture activity, two fewer days in the quarter and a smaller tax equivalent adjustment due to the lower corporate tax rate in 2018. The company expects an effective tax rate of approximately 21% for 2018, reflecting the lower statutory corporate rate, the elimination of certain deductions and reduced impact from state taxes, tax credits and tax-exempt income.