Basis of Presentation	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of Presentation	NOTE 2. BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 8-03 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. The interim consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, Avidia Bank, and its subsidiaries, Hudson Security Corporation, Eli Whitney Securities Corporation and 42 Main Street Corporation. The Bank is a state-chartered savings bank that provides depository and loan products to individual and corporate customers primarily in the central Massachusetts region. Hudson Security Corporation and Eli Whitney Securities Corporation engage in the investment of securities. 42 Main Street Corporation was established to hold, manage, and sell the Bank’s foreclosed real estate property. All significant intercompany balances and transactions have been eliminated in consolidation. Management has evaluated subsequent events through the date these consolidated financial statements were issued. On July 24, 2026, the Company's Board declared a cash dividend of $0.06 per common share, payable on or about August 27, 2026, to stockholders of record as of August 18, 2026. This dividend has been recorded in the Company's consolidated financial statements as of the declaration date. On August 4, 2026, the Company announced that the Board of Directors has authorized a stock buyback plan, under which the Company may repurchase up to $30 million in value of its common stock. Repurchases may be made from time to time on the open market, in privately negotiated transactions, and through the use of trading plans intended to qualify under Rule 10b5-1 under the Exchange Act. The extent to which the Company repurchases shares and the size and timing of these repurchases will depend on a variety of factors, including pricing, market conditions, and the Company's capital position. The stock buyback plan is scheduled to expire on July 31, 2027 and may be modified, suspended, or discontinued without prior notice at any time. There were no other subsequent events that require recognition and/or disclosure in the consolidated financial statements. In the opinion of management, the accompanying interim consolidated financial statements of the Company include all normal and recurring adjustments necessary for a fair presentation. Such adjustments are the only adjustments included in such financial statements. The results for any interim period are not necessarily indicative of results for the full year. These unaudited consolidated financial statements and notes hereto should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2025 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission. The significant accounting policies used in preparation of the Company's consolidated financial statements are disclosed in its 2025 audited consolidated financial statements, contained in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission. Use of Estimates In preparing consolidated financial statements in conformity with U.S. GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses and the realizability of deferred tax assets. Reclassification Certain items in prior consolidated financial statements have been reclassified to conform to the current presentation. Tax Credit Investments The Company invests in qualified affordable housing projects through limited liability entities to obtain tax benefits and to contribute to its local community. The Company has elected to account for these investments using the proportional amortization method whereby the amortization of the investment in the limited liability entity is in proportion to the tax credits utilized each year and amortization is recognized in the consolidated statements of operations as a component of income tax expense (benefit). These investments are reported in other assets in the consolidated balance sheets in the amounts of $791 thousand and $911 thousand at June 30, 2026 and December 31, 2025, respectively. Segment Information The Company's reportable segment is determined by the Chief Financial Officer, who is the designated chief operating decision maker, based upon information provided about the Company's products and services offered, primarily banking operations. The segment is also distinguished by the level of information provided by the chief operating decision maker, who uses such information to review performance of various components of the business, which are then aggregated if operating performance, products/services, and customers are similar. The chief operating decision maker will evaluate the financial performance of the Company's business components such as by evaluating revenue streams, significant expenses, and budget to actual results in assessing the Company's segment and in the determination of allocating resources. The chief operating decision maker uses revenue streams to evaluate product pricing and significant expenses to assess performance and evaluate return on assets. The chief operating decision maker uses consolidated net income to benchmark the Company against its competitors. The benchmarking analysis coupled with monitoring of budget to actual results are used in assessing performance and in establishing compensation. Loans, investments, and deposit product service fees provide the revenues in the banking operation. Interest expense, credit loss expense, and salaries and employee benefits, as reported on the consolidated statements of operations, provide the significant expenses in the banking operation. All operations are domestic. Accounting policies for segments are the same as those described herein. Segment performance is evaluated using consolidated net income. The measure of segment assets is reported on the consolidated balance sheets as total consolidated assets. Noncash items, such as depreciation and amortization, as well as expenditures for premises and equipment, are reported on the consolidated statements of cash flows. Employee Stock Ownership Plan ("ESOP") ESOP shares are shown as a reduction of stockholders' equity and are presented in the consolidated balance sheets and the consolidated statements of changes in stockholders’ equity as unallocated ESOP common stock. Compensation expense for the Company’s ESOP is recorded at an amount equal to the shares committed to be allocated by the ESOP multiplied by the average fair market value of the shares during the period. The Company recognizes compensation expense ratably over the period based upon the Company’s estimate of the number of shares committed to be allocated by the ESOP. When the shares are released, unallocated ESOP common stock is reduced by the cost of the ESOP shares released and the difference between the average fair market value and the cost of the shares committed to be allocated by the ESOP is recorded as an adjustment to additional paid-in capital. The loan receivable from the ESOP is not reported as an asset nor is the Company’s guarantee to fund the ESOP reported as a liability on the Company’s consolidated balance sheet. The employees of the Bank are the participants in the ESOP. Dividends paid on unallocated shares are used to repay the loan to the Company.

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 8-03 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations.

The interim consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, Avidia Bank, and its subsidiaries, Hudson Security Corporation, Eli Whitney Securities Corporation and 42 Main Street Corporation. The Bank is a state-chartered savings bank that provides depository and loan products to individual and corporate customers primarily in the central Massachusetts region. Hudson Security Corporation and Eli Whitney Securities Corporation engage in the investment of securities. 42 Main Street Corporation was established to hold, manage, and sell

the Bank’s foreclosed real estate property. All significant intercompany balances and transactions have been eliminated in consolidation.

Management has evaluated subsequent events through the date these consolidated financial statements were issued. On July 24, 2026, the Company's Board declared a cash dividend of $0.06 per common share, payable on or about August 27, 2026, to stockholders of record as of August 18, 2026. This dividend has been recorded in the Company's consolidated financial statements as of the declaration date. On August 4, 2026, the Company announced that the Board of Directors has authorized a stock buyback plan, under which the Company may repurchase up to $30 million in value of its common stock. Repurchases may be made from time to time on the open market, in privately negotiated transactions, and through the use of trading plans intended to qualify under Rule 10b5-1 under the Exchange Act. The extent to which the Company repurchases shares and the size and timing of these repurchases will depend on a variety of factors, including pricing, market conditions, and the Company's capital position. The stock buyback plan is scheduled to expire on July 31, 2027 and may be modified, suspended, or discontinued without prior notice at any time. There were no other subsequent events that require recognition and/or disclosure in the consolidated financial statements.

In the opinion of management, the accompanying interim consolidated financial statements of the Company include all normal and recurring adjustments necessary for a fair presentation. Such adjustments are the only adjustments included in such financial statements. The results for any interim period are not necessarily indicative of results for the full year. These unaudited consolidated financial statements and notes hereto should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2025 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission.

The significant accounting policies used in preparation of the Company's consolidated financial statements are disclosed in its 2025 audited consolidated financial statements, contained in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission.

Use of Estimates

In preparing consolidated financial statements in conformity with U.S. GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses and the realizability of deferred tax assets.

Tax Credit Investments

The Company invests in qualified affordable housing projects through limited liability entities to obtain tax benefits and to contribute to its local community. The Company has elected to account for these investments using the proportional amortization method whereby the amortization of the investment in the limited liability entity is in proportion to the tax credits utilized each year and amortization is recognized in the consolidated statements of operations as a component of income tax expense (benefit). These investments are reported in other assets in the consolidated balance sheets in the amounts of $791 thousand and $911 thousand at June 30, 2026 and December 31, 2025, respectively.

Segment Information

The Company's reportable segment is determined by the Chief Financial Officer, who is the designated chief operating decision maker, based upon information provided about the Company's products and services offered, primarily banking operations. The segment is also distinguished by the level of information provided by the chief operating decision maker, who uses such information to review performance of various components of the business, which are then aggregated if operating performance, products/services, and customers are similar. The chief operating decision maker will evaluate the

financial performance of the Company's business components such as by evaluating revenue streams, significant expenses, and budget to actual results in assessing the Company's segment and in the determination of allocating resources. The chief operating decision maker uses revenue streams to evaluate product pricing and significant expenses to assess performance and evaluate return on assets. The chief operating decision maker uses consolidated net income to benchmark the Company against its competitors. The benchmarking analysis coupled with monitoring of budget to actual results are used in assessing performance and in establishing compensation. Loans, investments, and deposit product service fees provide the revenues in the banking operation. Interest expense, credit loss expense, and salaries and employee benefits, as reported on the consolidated statements of operations, provide the significant expenses in the banking operation. All operations are domestic.

Accounting policies for segments are the same as those described herein. Segment performance is evaluated using consolidated net income. The measure of segment assets is reported on the consolidated balance sheets as total consolidated assets. Noncash items, such as depreciation and amortization, as well as expenditures for premises and equipment, are reported on the consolidated statements of cash flows.

Employee Stock Ownership Plan ("ESOP")

ESOP shares are shown as a reduction of stockholders' equity and are presented in the consolidated balance sheets and the consolidated statements of changes in stockholders’ equity as unallocated ESOP common stock. Compensation expense for the Company’s ESOP is recorded at an amount equal to the shares committed to be allocated by the ESOP multiplied by the average fair market value of the shares during the period. The Company recognizes compensation expense ratably over the period based upon the Company’s estimate of the number of shares committed to be allocated by the ESOP. When the shares are released, unallocated ESOP common stock is reduced by the cost of the ESOP shares released and the difference between the average fair market value and the cost of the shares committed to be allocated by the ESOP is recorded as an adjustment to additional paid-in capital. The loan receivable from the ESOP is not reported as an asset nor is the Company’s guarantee to fund the ESOP reported as a liability on the Company’s consolidated balance sheet. The employees of the Bank are the participants in the ESOP. Dividends paid on unallocated shares are used to repay the loan to the Company.