Basis of Presentation	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Overview The Company is a bank holding company (within the meaning of the Bank Holding Company Act of 1956, as amended) and the parent of Beacon Bank & Trust, a Massachusetts-chartered trust company. The Bank is a member of the Federal Reserve System. The Company's primary business is to provide commercial, business and retail banking services to its corporate, municipal and retail customers through the Bank and its non-bank subsidiaries. The Company is also the parent of Clarendon Private. Clarendon Private is a registered investment advisor with the SEC. Through Clarendon Private and the Trust and Investments Division of the Bank, the Company offers a wide range of wealth management services to individuals, families, endowments and foundations to help these clients meet their long-term financial goals. Beacon Bank & Trust operates 144 full-service banking offices in New England and New York with three additional lending offices. The Bank's activities include acceptance of commercial, municipal and retail deposits, origination of mortgage loans on commercial and residential real estate located principally in New England and New York, origination of commercial loans and leases, investment in debt and equity securities, and the offering of cash management and wealth, trust and investment advisory services. The Company also provides specialty equipment financing through its subsidiary Eastern Funding and provides small business lending through its subsidiary 44 Business Capital, both of which operate as national business lines. The Company and the Bank are supervised, examined and regulated by the FRB. As a Massachusetts-chartered trust company, the Bank is subject to supervision, examination and regulation by the Massachusetts Division of Banks. Clarendon Private is also subject to regulation by the SEC. The FDIC offers insurance coverage on all deposits up to $250,000 per depositor. As FDIC-insured depository institutions, the Bank is also subject to supervision, examination and regulation by the FDIC. Completion of Merger of Equals On September 1, 2025, the Company completed its merger of equals with Brookline Bancorp, Inc. (“Legacy Brookline”), pursuant to the Agreement and Plan of Merger, dated as of December 16, 2024, by and among the Company, Commerce Acquisition Sub, Inc. and Legacy Brookline (the “Merger Agreement”). On September 1, 2025, Commerce Acquisition Sub, Inc. merged with and into Legacy Brookline (the “Merger”), immediately followed by the merger of Legacy Brookline with and into the Company (the “Holdco Merger”), with the Company as the resulting corporation. The Company also changed its name from Berkshire Hills Bancorp, Inc. to Beacon Financial Corporation and changed the New York Stock Exchange ticker symbol for its common stock from “BHLB” to “BBT.” Immediately following the Holdco Merger, Berkshire Bank, a wholly owned subsidiary of the Company, Bank Rhode Island, a wholly owned subsidiary of Legacy Brookline, and PCSB Bank, a wholly owned subsidiary of Legacy Brookline, each merged with and into Brookline Bank, a wholly owned subsidiary of Legacy Brookline, with Brookline Bank as the surviving bank (the “Bank Mergers” and, together with the Merger and the Holdco Merger, the “Transaction”). In connection with the Bank Mergers, Brookline Bank changed its name to Beacon Bank & Trust. The Transaction was treated as a business combination under ASC 805 and was accounted for as a reverse merger using the acquisition method of accounting. Therefore, Legacy Brookline was deemed the acquirer for financial reporting purposes even though Legacy Berkshire was the legal acquirer. As such, the historical financial statements of Legacy Brookline became the historical financial statements of the combined company. Basis of Financial Statement Presentation The unaudited consolidated financial statements of the Company presented herein have been prepared pursuant to the rules of the SEC for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by GAAP. In the opinion of management, all adjustments (consisting of normal recurring adjustments) and disclosures considered necessary for the fair presentation of the accompanying consolidated financial statements have been included. Interim results are not necessarily reflective of the results of the entire year. The accompanying unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the fiscal year ended December 31, 2025. The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and balances are eliminated in consolidation. In preparing these consolidated financial statements, management is required to make significant estimates and assumptions that affect the reported amounts of assets, liabilities, income, expenses and disclosure of contingent assets and liabilities. Actual results could differ from those estimates based upon changing conditions, including economic conditions and future events. Material estimates that are particularly susceptible to significant changes in the near-term include the determination of the ACL and the determination of fair market values of assets and liabilities. The judgments used by management in applying these critical accounting policies may be affected by a further and prolonged deterioration in the economic environment, which may result in changes to future financial results. For example, subsequent evaluations of the loan and lease portfolio, in light of the factors then prevailing, may result in significant changes in the allowance for loan and lease losses in future periods, and the inability to collect outstanding principal may result in increased loan and lease losses. Reclassification Certain previously reported amounts have been reclassified to conform to the current year's presentation. Segment Reporting An operating segment is defined as a component of a business for which separate financial information is available that is evaluated regularly by the CODM in deciding how to allocate resources and evaluate performance. The Company is a bank holding company operating through a single business segment, which derives interest income on loan and lease products the Company offers to customers. Substantially all of the Company’s total revenues, pre-tax income, and assets is driven by the banking business. The President and Chief Executive Officer of the Company acts as the Company’s CODM. The CODM regularly reviews comprehensive financial information with the reported measures focused on net interest income and net income. This financial information reviewed is consistent with the information presented within the Company’s financial statements. The CODM uses the reported measures of net interest income and net income to assess performance by comparing to and monitoring against budget and prior year results. This information is used to manage resources to drive business and net earnings growth, including investment in key strategic priorities, as well as determine the Company's ability to return capital to shareholders.

The Company is a bank holding company (within the meaning of the Bank Holding Company Act of 1956, as amended) and the parent of Beacon Bank & Trust, a Massachusetts-chartered trust company. The Bank is a member of the Federal Reserve System. The Company's primary business is to provide commercial, business and retail banking services to its corporate, municipal and retail customers through the Bank and its non-bank subsidiaries. The Company is also the parent of Clarendon Private. Clarendon Private is a registered investment advisor with the SEC. Through Clarendon Private and the Trust and Investments Division of the Bank, the Company offers a wide range of wealth management services to individuals, families, endowments and foundations to help these clients meet their long-term financial goals.

Beacon Bank & Trust operates 144 full-service banking offices in New England and New York with three additional lending offices. The Bank's activities include acceptance of commercial, municipal and retail deposits, origination of mortgage loans on commercial and residential real estate located principally in New England and New York, origination of commercial loans and leases, investment in debt and equity securities, and the offering of cash management and wealth, trust and investment advisory services. The Company also provides specialty equipment financing through its subsidiary Eastern Funding and provides small business lending through its subsidiary 44 Business Capital, both of which operate as national business lines.

The Company and the Bank are supervised, examined and regulated by the FRB. As a Massachusetts-chartered trust company, the Bank is subject to supervision, examination and regulation by the Massachusetts Division of Banks. Clarendon Private is also subject to regulation by the SEC.

The FDIC offers insurance coverage on all deposits up to $250,000 per depositor. As FDIC-insured depository institutions, the Bank is also subject to supervision, examination and regulation by the FDIC.

On September 1, 2025, the Company completed its merger of equals with Brookline Bancorp, Inc. (“Legacy Brookline”), pursuant to the Agreement and Plan of Merger, dated as of December 16, 2024, by and among the Company, Commerce Acquisition Sub, Inc. and Legacy Brookline (the “Merger Agreement”). On September 1, 2025, Commerce Acquisition Sub, Inc. merged with and into Legacy Brookline (the “Merger”), immediately followed by the merger of Legacy Brookline with and into the Company (the “Holdco Merger”), with the Company as the resulting corporation. The Company also changed its name from Berkshire Hills Bancorp, Inc. to Beacon Financial Corporation and changed the New York Stock Exchange ticker symbol for its common stock from “BHLB” to “BBT.”

Immediately following the Holdco Merger, Berkshire Bank, a wholly owned subsidiary of the Company, Bank Rhode Island, a wholly owned subsidiary of Legacy Brookline, and PCSB Bank, a wholly owned subsidiary of Legacy Brookline, each merged with and into Brookline Bank, a wholly owned subsidiary of Legacy Brookline, with Brookline Bank as the surviving bank (the “Bank Mergers” and, together with the Merger and the Holdco Merger, the “Transaction”). In connection with the Bank Mergers, Brookline Bank changed its name to Beacon Bank & Trust.

The Transaction was treated as a business combination under ASC 805 and was accounted for as a reverse merger using the acquisition method of accounting. Therefore, Legacy Brookline was deemed the acquirer for financial reporting purposes even though Legacy Berkshire was the legal acquirer. As such, the historical financial statements of Legacy Brookline became the historical financial statements of the combined company.

The unaudited consolidated financial statements of the Company presented herein have been prepared pursuant to the rules of the SEC for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by GAAP. In the opinion of management, all adjustments (consisting of normal recurring adjustments) and disclosures considered necessary for the fair presentation of the accompanying consolidated financial statements have been included. Interim results are not necessarily reflective of the results of the entire year. The accompanying unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and balances are eliminated in consolidation.

In preparing these consolidated financial statements, management is required to make significant estimates and assumptions that affect the reported amounts of assets, liabilities, income, expenses and disclosure of contingent assets and liabilities. Actual results could differ from those estimates based upon changing conditions, including economic conditions and future events. Material estimates that are particularly susceptible to significant changes in the near-term include the determination of the ACL and the determination of fair market values of assets and liabilities.

The judgments used by management in applying these critical accounting policies may be affected by a further and prolonged deterioration in the economic environment, which may result in changes to future financial results. For example, subsequent evaluations of the loan and lease portfolio, in light of the factors then prevailing, may result in significant changes in the allowance for loan and lease losses in future periods, and the inability to collect outstanding principal may result in increased loan and lease losses.

An operating segment is defined as a component of a business for which separate financial information is available that is evaluated regularly by the CODM in deciding how to allocate resources and evaluate performance.

The Company is a bank holding company operating through a single business segment, which derives interest income on loan and lease products the Company offers to customers. Substantially all of the Company’s total revenues, pre-tax income, and assets is driven by the banking business.

The President and Chief Executive Officer of the Company acts as the Company’s CODM. The CODM regularly reviews comprehensive financial information with the reported measures focused on net interest income and net income. This financial information reviewed is consistent with the information presented within the Company’s financial statements.