Note 1 - Basis of Presentation	9 Months Ended
Sep. 30, 2025
Notes to Financial Statements
Basis of Accounting [Text Block]	Note 1 — Basis of Presentation The unaudited interim consolidated financial statements include the accounts of Waterstone Financial, Inc. (the “Company”) and the Company’s subsidiaries. WaterStone Bank SSB (the "Bank") is a community bank that has served the banking needs of its customers since 1921. WaterStone Bank owns Wauwatosa Investments, Inc, an investment subsidiary, and has an active mortgage banking segment, Waterstone Mortgage Corporation. WaterStone Bank conducts its community banking business from 14 banking offices located in Milwaukee, Washington and Waukesha Counties, Wisconsin. WaterStone Bank's principal lending activity is originating one- to four-family, multi-family residential real estate, and commercial real estate loans for retention in its portfolio. WaterStone Bank also offers home equity loans and lines of credit, construction and land loans, commercial business loans, and consumer loans. WaterStone Bank funds its loan production primarily with retail deposits and Federal Home Loan Bank advances. The Company's deposit offerings include: certificates of deposit, money market savings accounts, transaction deposit accounts, non-interest bearing demand accounts and individual retirement accounts. Wauwatosa Investments, Inc. operates in Nevada and owns and manages the majority of the consolidated investment portfolio. The investment securities portfolio is comprised principally of mortgage-backed securities, government-sponsored enterprise bonds and municipal obligations. WaterStone Bank's mortgage banking operations are conducted through its wholly-owned subsidiary, Waterstone Mortgage Corporation. Waterstone Mortgage Corporation originates single-family residential real estate loans for sale into the secondary market. Waterstone Mortgage Corporation utilizes lines of credit provided by WaterStone Bank as a primary source of funds, and also utilizes a line of credit with another financial institution as needed. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information, Rule 10-01 of Regulation S-X and the instructions to Form 10-Q. The financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring accruals) necessary to present fairly the financial position, results of operations, changes in shareholders’ equity, and cash flows of the Company for the periods presented. The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with the Company’s December 31, 2024 Annual Report on Form 10-K. Operating results for the three and nine months ended September 30, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025 or for any other period. The preparation of the unaudited consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates and assumptions include the allowance for credit losses, income taxes, and fair value measurements. Actual results could differ from those estimates. Subsequent Events The Company has evaluated subsequent events for potential recognition and/or disclosure through the date the unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q were issued. There were no significant subsequent events for the three and nine months ended September 30, 2025 through the issuance date of these unaudited consolidated financial statements that warranted adjustment to or disclosure in the unaudited consolidated financial statements. Impact of Recent Accounting Pronouncements The Company adopted ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” This update enhances the transparency and decision usefulness of income tax disclosures by providing better information regarding exposure to potential changes in jurisdictional tax legislation and related forecasting and cash flow opportunities. This update is effective for fiscal years beginning after December 15, 2024. Adoption of ASU No. 2023-09 did not have a material impact on the Company's consolidated financial statements.

Note 1 - Basis of Presentation

9 Months Ended

Sep. 30, 2025

Note 1 — Basis of Presentation

The unaudited interim consolidated financial statements include the accounts of Waterstone Financial, Inc. (the “Company”) and the Company’s subsidiaries.

WaterStone Bank SSB (the "Bank") is a community bank that has served the banking needs of its customers since 1921. WaterStone Bank owns Wauwatosa Investments, Inc, an investment subsidiary, and has an active mortgage banking segment, Waterstone Mortgage Corporation.

WaterStone Bank conducts its community banking business from 14 banking offices located in Milwaukee, Washington and Waukesha Counties, Wisconsin. WaterStone Bank's principal lending activity is originating one- to four-family, multi-family residential real estate, and commercial real estate loans for retention in its portfolio. WaterStone Bank also offers home equity loans and lines of credit, construction and land loans, commercial business loans, and consumer loans. WaterStone Bank funds its loan production primarily with retail deposits and Federal Home Loan Bank advances. The Company's deposit offerings include: certificates of deposit, money market savings accounts, transaction deposit accounts, non-interest bearing demand accounts and individual retirement accounts.

Wauwatosa Investments, Inc. operates in Nevada and owns and manages the majority of the consolidated investment portfolio. The investment securities portfolio is comprised principally of mortgage-backed securities, government-sponsored enterprise bonds and municipal obligations.

WaterStone Bank's mortgage banking operations are conducted through its wholly-owned subsidiary, Waterstone Mortgage Corporation. Waterstone Mortgage Corporation originates single-family residential real estate loans for sale into the secondary market. Waterstone Mortgage Corporation utilizes lines of credit provided by WaterStone Bank as a primary source of funds, and also utilizes a line of credit with another financial institution as needed.

The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information, Rule 10-01 of Regulation S-X and the instructions to Form 10-Q. The financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring accruals) necessary to present fairly the financial position, results of operations, changes in shareholders’ equity, and cash flows of the Company for the periods presented.

The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with the Company’s December 31, 2024 Annual Report on Form 10-K. Operating results for the three and nine months ended September 30, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025 or for any other period.

The preparation of the unaudited consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates and assumptions include the allowance for credit losses, income taxes, and fair value measurements. Actual results could differ from those estimates.

Subsequent Events

The Company has evaluated subsequent events for potential recognition and/or disclosure through the date the unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q were issued. There were no significant subsequent events for the three and nine months ended September 30, 2025 through the issuance date of these unaudited consolidated financial statements that warranted adjustment to or disclosure in the unaudited consolidated financial statements.

Impact of Recent Accounting Pronouncements

The Company adopted ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” This update enhances the transparency and decision usefulness of income tax disclosures by providing better information regarding exposure to potential changes in jurisdictional tax legislation and related forecasting and cash flow opportunities. This update is effective for fiscal years beginning after December 15, 2024. Adoption of ASU No. 2023-09 did not have a material impact on the Company's consolidated financial statements.