Citibank, N.A. is the primary U.S. banking subsidiary of Citigroup, a financial services multinational corporation. Citibank was founded in 1812 as City Bank of New York, and later became First National City Bank of New York. From Wikipedia
While Good Friday on April 18 marks a solemn Christian commemoration, it is not a federal holiday, with most services and businesses operating as usual, except major U.S. financial markets which will close.