NBT Bancorp (NBTB) 8-K NBT Bancorp Inc. Announces Cash Dividend

Exhibit 99.1

FOR IMMEDIATE RELEASE

ATTENTION: FINANCIAL AND BUSINESS EDITORS

Contact: John H. Watt Jr., President and CEO

Michael J. Chewens, CFO

NBT Bancorp Inc.

52 South Broad Street

Norwich, NY 13815

607-337-6119

NBT BANCORP INC. ANNOUNCES CASH DIVIDEND

NORWICH, NY (May 23, 2017) – The Board of Directors of NBT Bancorp Inc. (“NBT”) (NASDAQ: NBTB) approved a 2017 second-quarter cash dividend of $0.23 per share at a meeting held today May 23, 2017. The dividend will be paid June 15, 2017 to shareholders of record as of June 1, 2017.

Corporate Overview

NBT Bancorp Inc. is a financial holding company headquartered in Norwich, N.Y., with total assets of $8.9 billion at March 31, 2017. The company primarily operates through NBT Bank, N.A., a full-service community bank and through two financial services companies. NBT Bank, N.A. has 154 banking locations with offices in New York, Pennsylvania, Vermont, Massachusetts, New Hampshire and Maine. EPIC Advisors, Inc., based in Rochester, N.Y., is a full-service 401(k) plan recordkeeping firm. NBT-Mang Insurance Agency, based in Norwich, N.Y., is a full-service insurance agency. More information about NBT and its divisions can be found on the Internet at: www.nbtbancorp.com, www.nbtbank.com, www.epic1st.com and www.nbtmang.com.