Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]
Organization	Organization EWSB Bancorp, Inc. (the “Company”), a Maryland corporation and registered bank holding company, was formed to serve as the holding company for East Wisconsin Savings Bank (the “Bank”), upon conversion of Wisconsin Mutual Bancorp, MHC to the stock form of organization, which was completed on September 20, 2024. In connection with the conversion, the Company sold 752,538 shares of common stock, par value $0.01, including 52,678 shares sold to the Bank’s Employee Stock Ownership Plan, at $10.00 per share in its subscription offering for gross proceeds (before deducting offering expenses) of approximately $7.5 million. Shares of the Company’s common stock began trading on September 24, 2024 on the OTCQB Market under the trading symbol “EWSB”. The Bank provides a variety of financial services to individual and corporate customers. The Bank operates as a full-service financial institution with a primary market area including, but not limited to, east central Wisconsin. The Company is subject to the regulations of certain federal and state agencies and undergoes periodic examinations by those regulatory authorities.
Principles of Consolidation	Principles of Consolidation The financial statements include the accounts of EWSB Bancorp, Inc. and its subsidiary, East Wisconsin Savings Bank. All significant intercompany balances and transactions have been eliminated.
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Financial Statements were prepared in accordance with GAAP and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited financial statements and related notes of EWSB Bancorp, Inc’s Consolidated Financial Statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. The Company has not changed its significant accounting and reporting policies from those disclosed in the audited financial statements for the year ended December 31, 2024.
Use of Estimates in Preparation of Financial Statements	Use of Estimates in Preparation of Financial Statements The preparation of the accompanying financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. The determination of the allowance for credit losses and valuation allowance on deferred tax assets are particularly subject to change in the near term. Actual results may differ from these estimates. The results of operations for the three months ended March 31, 2025, are not necessarily indicative of results that may be expected for any other interim period or the entire fiscal year ending December 31, 2025.

Principles of Consolidation

The financial statements include the accounts of EWSB Bancorp, Inc. and its subsidiary, East Wisconsin Savings Bank. All significant intercompany balances and transactions have been eliminated.

Use of Estimates in Preparation of Financial Statements

Use of Estimates in Preparation of Financial Statements

The preparation of the accompanying financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. The determination of the allowance for credit losses and valuation allowance on deferred tax assets are particularly subject to change in the near term. Actual results may differ from these estimates. The results of operations for the three months ended March 31, 2025, are not necessarily indicative of results that may be expected for any other interim period or the entire fiscal year ending December 31, 2025.