Document and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Mar. 25, 2026 |
Jun. 30, 2025 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Entity Central Index Key | 0002058758 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Amendment Flag | false | ||
| Entity File Number | 001-42775 | ||
| Entity Registrant Name | Avidia Bancorp, Inc. | ||
| Entity Incorporation, State or Country Code | MD | ||
| Entity Tax Identification Number | 33-4239888 | ||
| Entity Address, Address Line One | 42 Main Street | ||
| Entity Address, City or Town | Hudson | ||
| Entity Address, State or Province | MA | ||
| Entity Address, Postal Zip Code | 01749 | ||
| City Area Code | 800 | ||
| Local Phone Number | 508-2265 | ||
| Title of 12(b) Security | Common stock, $0.01 par value | ||
| Trading Symbol | AVBC | ||
| Security Exchange Name | NYSE | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | true | ||
| Entity Ex Transition Period | false | ||
| ICFR Auditor Attestation Flag | false | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 0 | ||
| Entity Common Stock, Shares Outstanding | 20,076,250 | ||
| Auditor Firm ID | 7293 | ||
| Auditor Name | BDMP Assurance, LLP | ||
| Auditor Location | Portland, Maine | ||
| Auditor Opinion [Text Block] | Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheet of Avidia Bancorp, Inc. and Subsidiaries (the Company) as of December 31, 2025, and the related consolidated statements of operations, comprehensive income, changes in shareholders’ equity, and cash flows for the year then ended, and the related notes (collectively referred to as the consolidated financial statements). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2025, and the consolidated results of their operations and their cash flows for the year then ended, in conformity with U.S. generally accepted accounting principles.
We have also audited, in accordance with U.S. generally accepted auditing standards, the Company’s internal control over financial reporting as of December 31, 2025, based on criteria established in the Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) and our report dated March 27, 2026, expressed an unmodified opinion. The consolidated financial statements of the Company as of December 31, 2024 were audited by other auditors whose report dated March 14, 2025, expressed an unqualified opinion on those statements. |