- By Phone:
800-939-9103
Monday-Friday: 7:30am-7:00pm
Saturday: 8:30am-4:00pm
Sunday: 10:00am-2:00pm
888-885-8847 for 24 Hour Account Information - To Report Lost/Stolen ATM/Debit Card:
800-939-9103 during bank hours
800-264-5578 after bank hours - By Mail:
Cornerstone Bank
P.O. Box 370
Southbridge, MA 01550-0370