================================================================================



                           HUDSON RIVER BANCORP, INC.

                                       &

                              COHOES BANCORP, INC.

                           Updated Synopsis of Merger


                                  August 2000



================================================================================




     These investment  materials may contain forward- looking  statements within
the meaning of the Private Securities Litigation Reform Act of 1995 that involve
risk and  uncertainty.  It should be noted that a variety of factors could cause
the combined  company's actual results and experience to differ  materially from
the  anticipated  results or  expectations  expressed in the combined  company's
forward-looking statements.

     The risks and  uncertainties  that may affect the operations,  performance,
development,  growth  projections and results of the combined company's business
include,  but are not  limited  to, the  growth of the  economy,  interest  rate
movements, timely development by the combined company of technology enhancements
for its products and  operating  systems,  the impact of  competitive  products,
services and pricing,  customer based requirements,  Congressional  legislation,
acquisition cost savings and revenue  enhancements and similar matters.  Readers
of this  report are  cautioned  not to place undue  reliance on  forward-looking
statements  which are  subject  to  influence  by the  named  risk  factors  and
unanticipated future events. Actual results,  accordingly, may differ materially
from management expectations.

     Cohoes and Hudson River do not undertake,  and specifically  disclaim,  any
obligation to publicly release the results of any revisions which may be made to
any  forward-looking  statements  to reflect the  occurrence of  anticipated  or
unanticipated events or circumstances after the date of such statements.

     Hudson River has filed a Registration  Statement on Form S-4 concerning the
merger with the United States Securities and Exchange  Commission which includes
the joint merger proxy statement/prospectus  being provided to shareholders.  In
addition,   Hudson  River  and  Cohoes  each  intend  to  file  a  Solicitation/
Recommendation   statement  with  the  United  States  Securities  and  Exchange
Commission  in response to any Tender  Offer  Statements  to be filed by TrustCo
Bank Corp NY or  Ambanc  Holding  Co.,  Inc.  WE URGE  INVESTORS  TO READ  THESE
DOCUMENTS  BECAUSE THEY CONTAIN IMPORTANT  INFORMATION.  Investors are currently
able to obtain the Form S-4  Registration  Statement  and will be able to obtain
the Solicitation/  Recommendation  Statement of each company when filed, free of
charge at the SEC's website,  www.sec.gov. In addition, documents filed with the
SEC by Cohoes are  available  free of charge from the  Secretary of Cohoes at 75
Remsen Street, Cohoes, New York 12047, telephone (518) 233-6500. Documents filed
with the SEC by Hudson River are available  free of charge from the Secretary of
Hudson River at One Hudson City Centre,  Hudson, New York 12534, telephone (518)
828-4600.

     Cohoes  and  Hudson  River and their  respective  directors  and  executive
officers  may be deemed to be  participants  in the  solicitation  of proxies to
approve the Merger.  INFORMATION  ABOUT THE PARTICIPANTS MAY BE OBTAINED THROUGH
THE SEC'S  WEBSITE  FROM THE S-4  REGISTRATION  STATEMENT  FILED WITH THE UNITED
STATES SECURITIES AND EXCHANGE COMMISSION ON JUNE 26, 2000, as amended.



[GRAPHIC OMITTED:  Map of the counties in which  Hudson River Bancorp,  Inc. and
                   Cohoes Bancorp,  Inc. operate (Warren, Saratoga, Schenectady,
                   Albany,  Renssalaer, Greene,  Columbia and Dutchess)  showing
                   approximately  where in each county branch offices  of Cohoes
                   Savings Bank or Hudson River Bank & Trust Company exist.]




DESCRIPTION OF HUDSON RIVER (HRBT)
================================================================================

- -    Headquartered in Hudson, NY, the company provides full-service banking, as
     well as investment management, trust and commercial services through its
     subsidiary, Hudson River Bank & Trust Company. The company operates 18
     branch offices.

- -    A summary of Hudson River's balance sheet and earnings performance as of
     June 30, 2000 is as follows:

                                                    (in thousands)
                              Total Assets            $1,156,187
                              Loans, net                 822,501
                              Securities                 246,805
                              Deposits                   745,032
                              Total Equity               200,098
                              Equity to Assets             17.31%
                              LTM Earnings            $   10,108
                              LTM EPS                 $      .71
                              LTM ROE                       4.96%



DESCRIPTION OF COHOES BANCORP (COHB)
================================================================================

- -    Unitary holding company headquartered in Cohoes, NY. Its principal
     subsidiary, Cohoes Savings Bank, operates 21 banking locations throughout
     the NY upstate region.

- -    A summary of Cohoes' balance sheet and earnings performance as of June 30,
     2000 is as follows:

                                                   (in thousands)

                              Total Assets            $727,327
                              Loans, net               600,413
                              Securities                95,203
                              Deposits                 494,875
                              Total Equity             121,504
                              Equity to Assets           16.71%
                              LTM Earnings            $  6,077
                              LTM EPS                 $   0.76
                              LTM ROE                     4.77%



TRANSACTION DESCRIPTION - TERM SHEET
================================================================================

Exchange Ratio:     Fixed exchange ratio of 1.185 shares of HRBT for each COHB
                    share.

Value:              At deal  announcement, the   COHB shareholders  would  have
                    received  $11.04,  based on HRBT's closing  stock  price  of
                    $9.31 on 4/24/00. The aggregate offer would have been
                    approximately $87.3 million.  As of 7/31/00, COHB
                    shareholders would receive $14.22, based on HRBT's closing
                    price of $12.00 for an aggregate deal value of $113.1
                    million.

Ownership Profile:  HRBT 62% / COHB 38%



TRANSACTION DESCRIPTION - TERM SHEET
================================================================================

Management:         Chairman & CEO:  Robinson for first 36 mos.
                    President: Florio
                    On the third anniversary, CEO position shared between
                    Robinson and Florio, for a six month transition.  Then
                    Florio is sole CEO and Robinson continues as chairman.

Board of
Directors
Representation:     6 HRBT members / 6 COHB members

Accounting/
Stock Percentage:   Purchase Accounting; 100% Stock

Stock Purchase
Option:             Reciprocal standard 19.9% Agreements




TRANSACTION BENEFITS
================================================================================

     STRATEGIC:

          -    Creates a dominant franchise with assets of approximately $1.9
               billion and a $293 million market capitalization based on recent
               market prices

          -    Expands core market area and creates critical mass in upstate New
               York with a strong local presence

          -    Enhances ability to compete and widens product range through a
               broadened customer base with similar demographics

          -    Provides an additional platform for further growth




TRANSACTION BENEFITS
================================================================================

     FINANCIAL:

          -    Significantly accretive to earnings

          -    Strong capital position

          -    Purchase accounting provides flexibility to maintain stock
               repurchases

          -    Increases liquidity

          -    Identified cost savings of approximately $3.6 million.  After
               working together as a team, we fully expect cost saves to now
               exceed $5.5 million, a 53% increase from our original estimates.

          -    Revenue enhancements and/or deployment of excess capital/
               incremental cash will further enhance financial benefits




STRONG NY MARKET SHARE
================================================================================
Deposit Data & Market Share Information is as of June 30, 1999
Source: SNL Securities, L.P.

County      Institution      Total Deposits ($millions)  Market Share %
- ----------- ---------------  ---------------------       --------------

Albany         HRBT                $   38                    .62%
               COHB                   321                   5.32
                                   ------                  -----
               Pro Forma              359                   5.94

Columbia       HRBT                   457                  59.22

Dutchess       HRBT                    24                    .84

Greene         COHB                     1                    .17

Rensselaer     HRBT                    63                   4.08
               COHB                    57                   3.71
                                   ------                  -----
               Pro Forma              119                   7.79

Saratoga       COHB                    48                   2.87

Schenectady    HRBT                   176                   8.51
               COHB                    24                   1.18
                                   ------                  -----
               Pro Forma              200                   9.69

Warren         COHB                     7                    .71





STRONG BALANCE SHEET COMPOSITION
================================================================================

Estimated June 30, 2000 Pro Forma Balance Sheet  ($ in millions)

                                                                      Estimated
                                                  HRBT       COHB     Pro Forma
                                              ----------- ---------- -----------

Assets                                        $1,156        $727      $1,883
Net Loans                                        823         600       1,423
Investments                                      247          95         342
Deposits                                         745         495       1,240
Borrowings                                       182          96         278
Tangible Capital                                 189         122         311


STRONG BALANCE SHEET COMPOSITION
================================================================================

Estimated June 30, 2000 Pro Forma Balance Sheet  ($ in millions)

                                                                      Estimated
                                                  HRBT       COHB     Pro Forma
                                              ----------- ---------- -----------

App. Market Capitalization                    $  183      $  110      $  293

Nonperforming Loans                           $   13      $    4      $   17

Borrowings/Assets                              15.74%      13.20%      14.76%

Tangible Capital/Assets                        16.35%      16.70%      16.52%

LLR/Loans                                       2.43%       0.83%       1.78%

LLR/Nonperforming Loans                          158%        124%        146%




ATTRACTIVE EPS ACCRETION
================================================================================
($ in millions, except for per share data)

                                                                 Est. 2002
                                                               -------------
HRBT Estimated Net Income ($ .87)(1)                                $11.8
COHB Estimated Net Income ($1.00)(1)                                  6.9
                                                                    -----
     Total Estimated Net Income                                      18.7

After-Tax Cost Savings ($3.6 Pre-Tax)                                 2.3
After-Tax Earnings on Incremental Cash/ Capital                         0
Revenue Enhancements                                                    0
Purchase Accounting Adjustments (2)                                   2.0
                                                                    -----
     Pro Forma Net Income                                           $23.0
                                                                    =====

Estimated Pro Forma FD Shares                                        23.3
                                                                    -----
Pro Forma EPS                                                       $0.98
                                                                    =====

HRBT EPS Accretion                                                    13%

COHB EPS Accretion                                                    16%

(1)  Based on management expectations.
(2)  Includes amortization of negative goodwill generated in transaction plus
     any balance sheet mark to markets.




COST SAVING ANALYSIS
================================================================================

Non Interest Expense:
- --------------------------------
                                                    (In Thousands)

                                                  3/31          6/30
                                                 ------        ------

Salary & Benefits                                $1,669        $2,968

Occupancy Expense                                   104           304

ESOP Expense                                        616           616

Other Operating Expenses                          1,212         1,612
                                                 ------        ------

     Total                                       $3,601        $5,500


Estimated Pre-tax Merger and Restructuring Charges of $6mm

Note: Full phase-in expected in 2001.



REVENUE ENHANCEMENT OPPORTUNITIES
================================================================================

- -    Incremental earnings potential through ability to leverage excess capital

- -    Trust services

- -    Expansion of small business lending

- -    Cash management services

- -    Expanded legal lending limit



TIMING OF TRANSACTION
================================================================================

- -    Transition teams for both banks have been formed and are working on
     merger-related issues

- -    COHB & HRBT Shareholder votes both occur on August 17, 2000

- -    Transaction expected to close in early 4th Quarter, 2000

- -    Transaction must close by February 28, 2001






================================================================================




                        Proposal of TrustCo Bank Corp NY



================================================================================




                              PEER GROUP ANALYSIS:
                    TRST - A More Than Fully Valued Currency
================================================================================



                                                                    LTM                                    Dividend
                                         Assets  Tang Eq/ Loans/ ---------  Efficiency  Market  Net Int. ------------  Finc'l
Company                     State Ticker  ($M)    Assets  Assets ROAA ROAE     Ratio   Cap ($M) Margin   Payout Yield   Date
                            ----- ------ ------  -------- ------ ---------  ---------- -------- -------- ------------  ------
                                                                                
1 BSB Bancorp, Inc.          NY    BSBN  2,230.9   6.98    78.72 0.82 11.34     43.68     214.1  4.13     55.87   4.91  Mar-00
2 Harleysville National
     Corporation             PA    HNB   1,683.3   7.74    64.73 1.45 17.56     51.56     214.7  4.37     38.22   3.77  Mar-00
3 Main Street Bancorp, Inc.  PA    MBN   1,544.9   5.06    45.57 0.21  3.84     70.90      92.9  3.36    186.67   6.54  Jun-00
4 National Penn Bancshares,
     Inc.                    PA    NPBC  2,309.8   6.32    69.48 1.28 19.07     58.02     364.6  4.27     49.10   4.03  Jun-00
5 Oriental Financial
     Group, Inc.             PR    OFG   1,751.8   7.43    33.48 1.84 24.89     44.04     243.2  3.41     28.04   4.59  Mar-00
6 Sandy Springs Bancorp,
     Inc.                    MD    SASR  1,691.6   5.49    52.76 1.15 16.49     57.73     195.6  4.06     41.49   3.73  Jun-00
7 United National Bancorp    NJ    UNBJ  2,146.4   5.01    59.46 1.19 19.98     58.26     281.3  3.99     50.24   4.85  Jun-00
8 NBT Bancorp, Inc.          NY    NBTB  2,101.3   7.94    63.85 0.95 11.18     56.21     198.0  4.45     62.79   6.18  Jun-00
9 U.S.B. Holding Co., Inc.   NY    UBH   1,790.0   5.72    56.49 1.17 19.86     47.94     235.5  3.75     24.57   2.50  Jun-00

                             Average:    1,916.7   6.41    58.28 1.12 16.02     54.26     226.7  3.98     59.67   4.57
                             Median:     1,790.0   6.32    59.46 1.17 17.56     56.21     214.7  4.06     49.10   4.59

TrustCo Bank Corp of NY      NY    TRST  2,367.1   7.44    57.31 1.69 23.45     37.23     668.1  4.41     80.48   4.85  Jun-00



Peer group includes Mid Atlantic Banks with $1.5 billion - $2.5 billion in
assets and a tangible captial ratio between 5% and 8%

Pricing as of 7/28/00
Source: SNL Securities, L.P.



                              PEER GROUP ANALYSIS:
                    TRST - A More Than Fully Valued Currency
================================================================================



                                                     Price To           Average  Weekly         % owned by        YTD
                                         -------------------------------  Daily   Volume/   --------------------  Price   Finc'l
Company                     State Ticker  Book  TangBook Qtr EPS LTM EPS Volume  Shares Out Insiders Institution  Change   Date
                            ----- ------ -----  -------- ------- ------- ------- ---------- -------- -----------  ------  ------
                                                                                      
1 BSB Bancorp, Inc.          NY    BSBN  133.08 134.40     9.32   11.66   20,520   1.00      11.02      39.97       5.84   Mar-00
2 Harleysville National
     Corporation             PA    HNB   179.17 180.47     9.42    9.39    5,160   0.29       5.92      13.16      (8.65)  Mar-00
3 Main Street Bancorp, Inc.  PA    MBN   114.63 114.63      NM    29.58   19,060   0.91      10.52       5.93     (13.29)  Jun-00
4 National Penn Bancshares,
     Inc.                    PA    NPBC  232.73 241.49    12.89   12.81    6,320   0.18       9.50      12.31     (20.90)  Jun-00
5 Oriental Financial
     Group, Inc.             PR    OFG   173.02 173.02    10.33    8.88    8,940   0.35      26.02       6.87     (40.79)  Mar-00
6 Sandy Springs Bancorp,
     Inc.                    MD    SASR  184.97 223.31    11.61   10.87    4,800   0.25       5.34       5.48     (20.60)  Jun-00
7 United National Bancorp    NJ    UNBJ  221.77 235.71    11.78   11.70   10,300   0.34       6.60      21.14     (25.63)  Jun-00
8 NBT Bancorp, Inc.          NY    NBTB  121.55 121.95    15.72    9.99   40,000   1.08       7.59      18.28     (29.03)  Jun-00
9 U.S.B. Holding Co., Inc.   NY    UBH   207.33 208.7     12.18   12.39    2,240   0.07      35.16       3.70     (15.59)  Jun-00

                             Average:    174.25 181.52    11.66   13.03   13,038   0.50      13.07      14.09     (18.74)
                             Median:     179.17 180.47    11.70   11.66    8,940   0.34       9.50      12.31     (20.60)

TrustCo Bank Corp of NY      NY    TRST  375.00 375.00    16.45   17.12   36,640*  0.34      13.00      20.03      (6.60)  Jun-00



Peer group includes Mid Atlantic Banks with $1.5 billion - $2.5 billion in
assets and a tangible captial ratio between 5% and 8%

Pricing as of 7/28/00
Source: SNL Securities, L.P.


An average of 7,250 shares repurchased are estimated to be related to the
DRIP program



                              TrustCo Bank Corp NY
                      Total Shareholder Return Comparison
================================================================================



                                                                     Total Shareholder Return -
                                                  Price To           Holding Period Percentage*
                                   Assets   ------------------ ---------------------------------------
Company                     Ticker  ($M)    Qtr EPS* TangBook*    3 Year      5 Year       10 Year
                            ------ ------   -------- --------- ----------- ------------ --------------
                                                                   
TrustCo Bank Corp of NY     TRST    2,367.1   16.28    375.00     20.6          21.4           23.2

BSB Bancorp, Inc.           BSBN    2,230.9    8.35    134.40     (4.1)         12.5           20.7
Commerce Bancorp, Inc.      CBH     7,464.1   20.98    405.29     22.4          33.5           28.8
Harleysville National
     Corporation            HNBC    1,683.3   10.45    180.47      5.5          10.3           14.8
M&T Bank Corporation        MTN    21,746.1   12.87    291.42     11.1          22.5           23.4
National Penn Bancshares,
     Inc.                   NPBC    2,309.8   12.42    241.49      5.5          12.5           12.5
NBT Bancorp, Inc.           NBTB    2,101.3   16.18    121.95    (12.0)          5.7           10.2
North Fork Bancorporation,
     Inc.                   NFB    14,682.7    7.94    279.00      5.0          23.6           16.9
Sandy Springs Bancorp,
     Inc.                   SASR    1,691.6   12.18    223.31      5.8           9.5           31.2
Summit Bancorp              SUB    38,985.1    8.13    178.83     16.8           7.4           12.5
United National Bancorp     UNBJ    2,146.4   10.58    235.71      7.8          12.9           15.5

                        Average:    9,504.1   12.02    229.19      6.4          15.0           18.7
                        Median:     2,270.3   11.38    229.51      5.7          12.5           16.2



Note: Analysis assumes all dividends are reinvested in security

Pricing as of 7/28/00
Analysis review date:  Month ending June 30, 2000


Sources: Bloomberg and SNL Securities, L.P.



Analyst View TRST Stock as Fully-Valued
================================================================================

                                             Last     2000     2001    EPS
Firm Name                  Recommendation Confirmed EPS Est. EPS Est. Growth
- -------------------------- -------------- --------- -------- -------- ------
First Albany Corp.         Neutral         02/07/00  0.76      N/A     10.0%
Corinthian Partners        Market Perform  02/09/00  0.78     0.85     10.3%
Sandler O'Neill & Partners Market Perform  07/03/00  0.78     0.85      N/A

                                           Average: $0.77    $0.85     10.2%
                                            Median: $0.78    $0.85     10.2%
                                              High: $0.78    $0.85     10.3%
                                               Low: $0.76    $0.85     10.0%




                     Lack of Acquisition Expertise Presents
                          High Level of Execution Risk
================================================================================

      Acquisition      Asset Size (000)  Share Buyback
      ---------------  ----------------  ---------------------------------
1991  Home and City
         Savings Bank       $864.8       as needed for retail DRIP program

1992  none                               as needed for retail DRIP program

1993  none                               as needed for retail DRIP program

1994  none                               as needed for retail DRIP program

1995  none                               as needed for retail DRIP program

1996  none                               as needed for retail DRIP program

1997  none                               as needed for retail DRIP program

1998  none                               as needed for retail DRIP program

1999  none                               as needed for retail DRIP program

2000  Landmark Financial
          Corp              $ 26.4       as needed for retail DRIP program



                       Valuation at Extremely High Levels
================================================================================

- -    On a GAAP Earnings basis, TRST trades at a 7 multiple premium to a peer
     group of regional banks with assets between $1.5 billion and $3.0 billion

- -    TRST is also fully valued on a cash earnings basis, trading at a 6-7
     multiple premium to regional peer group

- -    On a tangible book value basis, TRST (nearly 4 times book) trades at a
     2 multiple premium to regional peers (2 times book)

- -    The dividend discount valuation suggests that TRST is overvalued given its
     premium valuation and earnings growth prospects



                            Why the TRST Stock Price
                             will be Under Pressure
================================================================================

- -    Deal initially dilutive to TRST EPS

- -    56% cost savings (of 12/31/99 non-interest expense) announced in
     Registration Statement carries substantial integration risk

- -    Cost savings implies substantial branch closings.  Resulting reduced
     customer service will create customer retention issues and disruption to
     core franchise

- -    TrustCo assumes no customer/revenue runoff in pro forma projections




                           Why COHB/HRBT Makes Sense
================================================================================

1.   Accretive to EPS

2.   Merger rationale predicated on growth

3.   Minimal disruption to customers and core franchise

4.   Moderate dividend payout ratio with substantial potential for dividend
     growth

5.   Excess captial provides for tremendous growth opportunities and share
     repurchases

6.   Minimal integration risk/branch overlap

7.   "Friendly" merger with similar cultures/philosophies

8.   Definitive Agreements in place and all strategic/cultural issues in place

9.   Creates $2 billion franchise and a "double dip" opportunity





                     Why TrustCo Offer Does Not Make Sense
================================================================================

1.   Initially dilutive to TRST EPS by 6%

2.   Substantial book value dilution to both COHB and HRBT shareholders

3.   Predicated on cost savings

4.   Substantial disruption to customers/core franchise

5.   High dividend payout with low potential for growth

6.   Growth constrained by lack of capital

7.   High integration risk/revenue runoff

8.   "Hostile" merger with culture clash

9.   11 conditions and terms specified as a condition for merger

10.  Fully valued TRST currency trading at takeout value makes "double dip"
     opportunity unlikely



                    Why the TRST tender will never occur and
                          how shareholders could lose
================================================================================

- -    Tender of enough shares of COHB/HRBT stock so that, after completion of the
     offer, TRST owns at least a majority of the shares of COHB stock (on a
     fully diluted basis)

- -    Stockholders of COHB/HRBT not having approved the merger of COHB/HRBT

- -    Requires valid termination of the proposed COHB/HRBT merger agreement

- -    Requires valid termination of the HRBT/COHB option agreement

- -    Requires execution of a definitive merger agreement between TRST and
     COHB or HRBT

- -    Receipt of all required regulatory approvals

- -    Effectiveness of registration statement filed by TRST

- -    TRST being satisfied that the provisions of Section 203 of the
     Delaware General Corporation Law do not apply to TRST offer and the
     proposed TRST/COHB or TRST/HRBT merger

- -    Approval by TRST stockholders of the issuance of TRST stock for either
     offer

- -    Receipt of an opinion that the tender offer and subsequent merger
     constitute a tax-free reorganization

- -    Absence of any prospective material adverse change in the sole judgment
     of TRST



Why Ambanc Offer Does Not Make Sense
================================================================================

- -    Lack of public filing makes deal or pro forma data difficult to ascertain

- -    AHCI offer ($16.50 in cash) represents deal value of $129.3 million

- -    As of March 31, 2000 AHCI had assets of $721 million and tangible equity
     of $68.1 million

- -    AHCI "core franchise" (thrift only) estimated at approximately $500
     million

- -    Pro forma AHCI/COHB franchise estimated to have a tangible capital ratio
     of approximately 4% post merger, which presents significant hurdles to
     regulatory approvals.  Further, it appears AHCI is assuming HRBT walks
     away from its option for no compensation.

- -    4.0% post-merger tangible capital ratio would constrain growth
     opportunities for AHCI

- -    AHCI 1998 purchase of AFSALA Bancorp is largest acquisition implemented by
     AHCI

- -    COHB/HRBT management estimates that AHCI would have to raise proceeds via
     sale of availble for sale securities at a substantial loss

- -    AHCI over the past several years has been seeking to be acquired.  COHB had
     preliminary discussion but passed after the completion of due diligence.
     COHB's last offer in June 2000 was rejected by AHCI.