v3.22.2.2
Document and Entity Information
Dec. 05, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 05, 2022
Entity File Number 000-14703
Entity Registrant Name NBT BANCORP INC.
Entity Central Index Key 0000790359
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 16-1268674
Entity Address, Address Line One 52 South Broad Street
Entity Address, City or Town Norwich
Entity Address, State or Province NY
Entity Address, Postal Zip Code 13815
City Area Code 607
Local Phone Number 337-2265
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share
Trading Symbol NBTB
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false