CIBC Branches will be closed Monday May 18 for Victoria Day. ATMs at most locations will be available throughout the holiday period. CIBC Online Banking, CIBC Online Banking, CIBC Mobile Banking and CIBC Telephone Banking are available 24 hours a day, 7 days a week. Please note: Transactions conducted on weekends and holidays or after 6 p.m. EST will be effective the next business day.