    <SEC-DOCUMENT>0001140361-21-012878-index.html : 20210415
    <SEC-HEADER>0001140361-21-012878.hdr.sgml : 20210415
    <ACCEPTANCE-DATETIME>20210415083207
    ACCESSION NUMBER:		0001140361-21-012878
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		19
    CONFORMED PERIOD OF REPORT:	20210525
    FILED AS OF DATE:		20210415
    DATE AS OF CHANGE:		20210415

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NBT BANCORP INC
    		CENTRAL INDEX KEY:			0000790359
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				161268674
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-14703
    		FILM NUMBER:		21827384

    	BUSINESS ADDRESS:
    		STREET 1:		52 S BROAD ST
    		CITY:			NORWICH
    		STATE:			NY
    		ZIP:			13815
    		BUSINESS PHONE:		6073372265

    	MAIL ADDRESS:
    		STREET 1:		52 S. BROAD STREET
    		CITY:			NORWICH
    		STATE:			NY
    		ZIP:			13815
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>nc10020076x1_def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: nc10020076x1_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>nc10020076x1_image01.jpg
    <TEXT>
    Document 2 - file: nc10020076x1_image01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>nc10020076x1_image02.jpg
    <TEXT>
    Document 3 - file: nc10020076x1_image02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>nc10020076x1_image03.jpg
    <TEXT>
    Document 4 - file: nc10020076x1_image03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>nc10020076x1_image04a.jpg
    <TEXT>
    Document 5 - file: nc10020076x1_image04a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>nc10020076x1_image04b.jpg
    <TEXT>
    Document 6 - file: nc10020076x1_image04b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>nc10020076x1_image04c.jpg
    <TEXT>
    Document 7 - file: nc10020076x1_image04c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>nc10020076x1_image04d.jpg
    <TEXT>
    Document 8 - file: nc10020076x1_image04d.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>nc10020076x1_image04e.jpg
    <TEXT>
    Document 9 - file: nc10020076x1_image04e.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>nc10020076x1_image04f.jpg
    <TEXT>
    Document 10 - file: nc10020076x1_image04f.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>nc10020076x1_image04g.jpg
    <TEXT>
    Document 11 - file: nc10020076x1_image04g.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>nc10020076x1_image04h.jpg
    <TEXT>
    Document 12 - file: nc10020076x1_image04h.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>nc10020076x1_image04i.jpg
    <TEXT>
    Document 13 - file: nc10020076x1_image04i.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>nc10020076x1_image04j.jpg
    <TEXT>
    Document 14 - file: nc10020076x1_image04j.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>nc10020076x1_image04k.jpg
    <TEXT>
    Document 15 - file: nc10020076x1_image04k.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>nc10020076x1_image04l.jpg
    <TEXT>
    Document 16 - file: nc10020076x1_image04l.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>nc10020076x1_image05.jpg
    <TEXT>
    Document 17 - file: nc10020076x1_image05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>nc10020076x1_image06.jpg
    <TEXT>
    Document 18 - file: nc10020076x1_image06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>nc10020076x1_image07.jpg
    <TEXT>
    Document 19 - file: nc10020076x1_image07.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>