1

May 5, 2015

2

Michael J. Chewens Senior Executive Vice President and Chief Financial Officer

3

Timothy L. Brenner Executive Vice President and President of Wealth Management

4

Jeffrey M. Levy Executive Vice President and President of Commercial Banking

5

F. Sheldon Prentice Executive Vice President, General Counsel and Corporate Secretary

6

David E. Raven Executive Vice President, President of Retail Banking and President of Pennsylvania

7

Catherine M. Scarlett Executive Vice President and Chief Human Resources Officer

8

Joseph R. Stagliano Executive Vice President and Chief Information Officer

9

Howard L. Atkinson Executive Vice President, Strategic Operations

10

Jack H. Webb Executive Vice President, Strategic Support

11 11

12 12

2014 Financial Highlights

13

Record Performance in 2014

$75.1 Million Record Net Income

14

$54.8

$69.9

$75.8

$35.0

$45.0

$55.0

$65.0

$75.0

$85.0

2012 2013 2014

Core Net Income In Millions

15

Record Performance in 2014

Core Earnings Per Share

Second Highest Ever

$1.71

16

$1.63

$1.65

$1.71

$1.56

$1.60

$1.64

$1.68

$1.72

2012 2013 2014

Core Earnings Per Share

17

Record Performance in 2014

• Net Interest Income $251.9 Million

• Core Noninterest Income $105.9 Million

18

Record Performance in 2014

• Total Assets $7.8 Billion

• Loans at $5.6 Billion

• Deposits at $6.3 Billion

19

Sale of Ownership Interest

Springstone • Niche consumer lending line of business • Providing financing options for K–12 private

education and elective medical procedures • Formed in 2006 • Located in Boston • NBT invested in 2007 with a

20% ownership interest

20

Sale of Ownership Interest

Springstone • Sold 20% ownership interest in April 2014

• $25 million total gain on initial investment of $3 million

• Leveraged gain to restructure long-term borrowings

21

$3.79

$4.44

$4.02

$4.25

$3.50

$3.70

$3.90

$4.10

$4.30

$4.50

2011 2012 2013 2014

Loan balances shown without acquired portfolios

Performance Drivers: Organic Loan Growth In Billions

22

2014 Diversified Loan Portfolio

44% Commercial

Lending

36% Consumer Lending

20% Residential Mortgages

23

Record Performance in 2014

U.S. Small Business Administration

Top Large Community Lender

4th Straight Year

24

$4.44$4.25$4.02$3.79

$0.26

$1.15$1.15

$2.50

$3.50

$4.50

$5.50

$6.50

2011 2012 2013 2014

Acquired Loans

Originated Loans

Performance Drivers: Organic Loan Growth In Billions

25

$1,400$1,297

$1,103$963

$3

$37

$187$270

$700

$900

$1,100

$1,300

$1,500

$1,700

2011 2012 2013 2014

Acquired DDA

DDA Balance

Excluding acquisitions, growth in 2012, 2013 and 2014 was 14.6%, 17.6% and 8.0%, respectively.

% Growth 18.0% 30.2% 12.5% (as compared to previous year)

Performance Drivers: DDA Deposit Growth Average Balances In Millions

26

Performance Drivers: Efficiency Ratio

Source: SNL Peer Analytics

63.9%

61.3%

60.8%

56.0%

60.0%

64.0%

68.0%

2012 2013 2014 NBT Consolidated

27 27

Strong, Sustained Financial Performance

28

Peer Group Listing

Company Ticker Location

Berkshire Hills Bancorp Inc. BHLB Pittsfield, MA

Brookline Bancorp Inc. BRKL Boston, MA

Community Bank System Inc. CBU De Witt, NY

Flagstar Bancorp Inc. FBC Troy, MI

First Commonwealth Financial FCF Indiana, PA

Flushing Financial Corp. FFIC Lake Success, NY

First Midwest Bancorp Inc. FMBI Itasca, IL

F.N.B. Corp. FNB Hermitage, PA

Independent Bank Corp. INDB Rockland, MA

MB Financial Inc. MBFI Chicago, IL

NBT Bancorp Inc. NBTB Norwich, NY

Company Ticker Location

National Penn Bancshares Inc. NPBC Boyertown, PA

Northwest Bancshares, Inc. NWBI Warren, PA

Old National Bancorp ONB Evansville, IN

Provident Financial Services PFS Jersey City, NJ

Park National Corp. PRK Newark, OH

PrivateBancorp Inc. PVTB Chicago, IL

S&T Bancorp Inc. STBA Indiana, PA

Tompkins Financial Corporation TMP Ithaca, NY

TrustCo Bank Corp NY TRST Glenville, NY

UMB Financial Corp. UMBF Kansas City, MO

29

Components of Profitability

• Core Return on Average Assets

• Core Return on Average Tangible Equity

• Net Interest Margin

• Efficiency Ratio

• Nonperforming Assets to Total Assets

30

Relative Average Ranking Year Ended December 31, 2014

Ratios

Relative Peer Ranking

Core Return on Average Tangible Equity 3 Core Return on Average Assets 9 Net Interest Margin 5 Efficiency Ratio 10 Nonperforming Assets to Total Assets 8 NBTB Average Ranking 7.0

31

Peer Group Relative Average Ranking Year Ended December 31, 2014

CBUNBTB TM

PNPB

C

FNB

PVTB

STBA

MBFIIN

DBONB

BRKLPFS PRK

BHLBTR

STFM

BIFF

ICUMBFNW

BIFC

FFB

C

3.0

7.0 7.4 7.6 9.0 9.2 9.6

11.4

8.2

2

4

6

8

10

12

14

16

18

20

8.2 8.2

10.2 10.6 12.2 12.2

13.0 13.4 14.6

17.0 17.8

20.6

32

Peer Group Relative Average Ranking Five-Year Average (2010 to 2014)

CBUNBTBSTB

A

FNB

BRKLTM

PIN

DBNPB

C

PRKONB

BHLB PFSTR

STFF

ICUMBFMBFIPVT

BNW

BIFM

BIFC

FFB

C

2.8

6.2 6.6 7.6

9.4 9.8 10.2 11.6

8.8

2

4

6

8

10

12

14

16

18

20

7.8 8.0

11.0 11.2 12.0 12.6

13.6 14.4 14.6 15.2

16.6

20.8

33 33

NBT Bancorp Stock

34

• Traded on NASDAQ Global Select Market

• Ticker Symbol: NBTB

• Institutional Ownership: 44%

• Average Daily Volume: 100,000

NBT Bancorp Stock

35

-12%

-10%

-8%

-6%

-4%

-2%

0%

2%

4%

6%

NASDAQ Financial Index NBTB

Relative Performance One Year | For the Period from 12/31/2013 to 12/31/2014

1 Year % Increase: NASDAQ 5.05% NBTB 5.07%

36

Relative Performance Five Years | For the Period from 12/31/2009 to 12/31/2014

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

NASDAQ Financial Index NBTB

5 Year % Increase: NASDAQ 79.54% NBTB 55.31%

37

Relative Performance Ten Years | For the Period from 12/31/2004 to 12/31/2014

-30%

-15%

0%

15%

30%

45%

NASDAQ Financial Index NBTB

10 Year % Increase: NASDAQ 42.55% NBTB 45.83%

38

Annualized Total Shareholder Return One Year | For the Period From 12/31/2013 to 12/31/2014

21.1

1%

15.6

0%

12.1

8%

11.3

5%

9.71

%

9.22

%

9.00

%

7.99

%

-10.

13%

-19.

83%-4

.58%

-3.2

9%

-3.2

0%

-0.8

4%

-0.5

9%

-0.0

6%

0.70

%

0.91

%4.29

%

5.07

%

5.10

%

-25%

-20%

-15%

-10%

-5%

0%

5%

10%

15%

20%

25%

STBA

PVTB

INDB

TMP

FNB

PRK

BRKLFC

FTR

STNBTBMBFIFF

ICBHLB ONBFM

BICBUPF

SNPB

CNW

BIUMBF

FBC

39

Annualized Total Shareholder Return Five Years | For the Period From 12/31/2009 to 12/31/2014

15.4

2%

15.2

3%

14.6

9%

10.3

2%

9.61

%

8.44

%

9.20

%

30.3

8%

19.7

9%

12.3

3%

11.7

5%18.6

9%

17.5

0%

18.9

0%

16.6

2%

15.7

1%

-23.

48%

4.00

%

6.67

%

7.61

%

7.92

%

-25%

-20%

-15%

-10%

-5%

0%

5%

10%

15%

20%

25%

30%

35%

PVTB FNB

CBUIN

DBFC

FFF

ICNPBC

PFSSTB

APRKTM

PMBFIFM

BIUMBFNBTBBHLBNW

BITR

STONB

BRKLFB

C

40

Annualized Total Shareholder Return Ten Years | For the Period From 12/31/2004 to 12/31/2014

-38.

37%

9.00

%

7.01

%

0.89

%

0.80

%5.72

%

5.14

%

6.63

%

3.84

%

2.59

%

1.12

%

0.94

%

3.61

%

-1.1

3%

-0.7

2%

-0.1

2%

-1.3

7%

-1.4

6%

-1.5

1%

-3.6

1%

-5.4

7%

-40%

-35%

-30%

-25%

-20%

-15%

-10%

-5%

0%

5%

10%

15%

UMBFCBUTM

PNW

BIIN

DBNBTBFF

ICPFS FN

BSTB

APRK

PVTBBRKLBHLBMBFIONBFC

FTR

STNPBCFM

BIFB

C

41

Peer Group Dividend Yield As of December 31, 2014

Median is 3.04% Source: SNL Financial

1.70

%

1.87

%

2.96

%

2.70

%

2.42

%

2.24

%

0.00

%

0.12

%

1.65

%

4.18

%

4.25

%

2.96

%

3.04

%

3.04

%

3.15

%

3.20

%

3.32

%

3.39

%

3.60

%

3.62

%4.15

%

0.00%

1.00%

2.00%

3.00%

4.00%

5.00%

PRKNPBCNW

BITR

STFN

BBRKL

PFSNBTB CBU

FCF

TMP

ONBFF

ICBHLBSTB

AIN

DBFM

BIMBFI

UMBFPVTB FB

C

42

Dividend Yield: NBT vs. Peer Median

2.00%2.25%2.50%2.75%3.00%3.25%3.50%3.75%4.00%4.25%4.50%4.75%5.00%

2010 2011 2012 2013 2014 NBTB Peer Median

43

Dividend Payout Ratio

48% 46% 52%

44% 52%

48% 47% 49% 55%

50%

0%

20%

40%

60%

80%

100%

NBTB

44 44

External Validation

45

Analyst Reports

NBTB is a very profitable and high performing company. ’’

’’

46

Analyst Reports

We remain positive on NBT’s fundamentals and believe the company should continue to post solid profitability and credit quality metrics. ’’

’’

47

Analyst Reports

We view NBT Bancorp Inc. as a well-run institution with strong credit metrics… ’’

’’

48 48

Business Initiatives

49 49

NBT in New England

50

NBT in New England

51

Portland, Maine

NBT in New England

Rutland, Vermont

52

NBT in New England

• Presence in 4 states • 16 locations • 94 employees • Over $700 million

in loans

53 53

Digital Banking

54

Digital Banking

• Deposit Automation at ATMs • Mobile Banking Enhancements • Digital Branches

55

Self Service Transactions

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

1Q14 2Q14 3Q14 4Q14 1Q15

56 56

Compliance

57

Compliance

Recent Local Enforcement Actions

58

Compliance

• Dodd-Frank, CFPB and consumer activism • Expanded investment in compliance • Unfair, Deceptive or Abusive Acts

and Practices (UDAAP)

• Consumer impact • Over 1,800 compliance experts • Compliance as a competitive advantage

59 59

First Quarter 2015 Highlights

60

First Quarter 2015 Highlights

• Net Income of $18.2 Million

• Stable Net Interest Margin at 3.60%

• Net Charge-offs to Average Loans 0.34%

• 5% Dividend Increase

61 61