Organization and Nature of Operations	12 Months Ended
Dec. 31, 2025
Basis of Presentation [Abstract]
Organization and Nature of Operations	Note–1 - Organization and Nature of Operations Organizational Structure Lake Shore Bancorp, Inc. (the “Company” or "Lake Shore Bancorp") is the parent holding company for Lake Shore Bank (the "Bank"). Lake Shore Bancorp, Inc., a federal corporation ("Lake Shore Federal Bancorp) and the former parent mutual holding company, Lake Shore, MHC (the “MHC”) were formed on April 3, 2006 to serve as the savings and loan holding companies for Lake Shore Savings Bank, upon Lake Shore Savings Bank’s initial conversion and reorganization from a New York State chartered mutual savings and loan association to the federal mutual holding company form of organization. On July 18, 2025, Lake Shore Bancorp, Inc., a new corporation incorporated under the laws of the State of Maryland, became the bank holding company of Lake Shore Bank upon the completion of a "second-step" conversion (the "Conversion"). Pursuant to the Conversion, Lake Shore Savings Bank, a federally chartered savings bank, the wholly-owned subsidiary of Lake Shore Federal Bancorp, reorganized from the two-tier mutual holding company structure to the fully-public stock holding company structure. In addition, Lake Shore Savings Bank converted its charter from a federal savings bank to a New York commercial bank renamed Lake Shore Bank. The Conversion was consummated through the merger of Lake Shore, MHC with and into Lake Shore Federal Bancorp, followed by the merger of Lake Shore Federal Bancorp with and into Lake Shore Bancorp. In the subscription offering, Lake Shore Bancorp raised gross proceeds of $49.5 million by selling 4,950,460 shares of its common stock (approximately the midpoint of the offering range) at $10.00 per share to depositors of the Bank. The Company used $4.0 million of the proceeds to fund an addition to its Employee Stock Ownership Plan ("ESOP") loan for the acquisition of an additional 396,036 shares at $10.00 per share. Expenses incurred related to the offering were $2.3 million and have been recorded against offering proceeds. As part of the Conversion transaction, outstanding shares of Lake Shore Federal Bancorp common stock owned by the public stockholders of Lake Shore Federal Bancorp (stockholders other than Lake Shore, MHC) as of July 18, 2025 were converted into shares of Lake Shore Bancorp's common stock based on an exchange ratio of 1.3549 shares of Lake Shore Bancorp's common stock for each share of Lake Shore Federal Bancorp common stock so that Lake Shore Federal Bancorp's existing public stockholders would own approximately the same percentage of Lake Shore Bancorp's common stock as they owned of Lake Shore Federal Bancorp's common stock immediately prior to the Conversion. A total of 7,825,501 shares of common stock were outstanding following the completion of the stock offering. In connection with the Conversion, the Company established a liquidation account for the benefit of eligible and supplemental eligible account holders as defined in the Plan of Conversion and Reorganization of the MHC in an amount equal to the net worth of the Company as of the date of the latest consolidated balance sheet appearing in the final prospectus distributed in connection with the Conversion. The liquidation account will be maintained for the benefit of eligible account holders and supplemental eligible account holders who maintain their accounts at the Bank after the Conversion. The liquidation account will be reduced annually to the extent that such account holders have reduced their qualifying deposits as of each fiscal year end. Subsequent increases will not restore an account holder's interest in the liquidation account. In the event of a complete liquidation of the Company or the Bank, each such account holder will be entitled to receive balances for accounts then held. Share and per share amounts related to periods prior to the date of Conversion (July 18, 2025) have been adjusted to give retroactive recognition to the exchange ratio applied in the Conversion (1.3549). Charter Lake Shore Bancorp, Inc. is regulated by the Federal Reserve Board and Lake Shore Bank, the wholly-owned subsidiary of Lake Shore Bancorp, Inc., is a New York State chartered commercial bank and regulated by New York Department of Financial Services ("NYSDFS") and the Federal Deposit Insurance Corporation (the “FDIC”). Nature of Business The Company’s primary business is the ownership and operation of its subsidiary, the Bank. The Bank is engaged primarily in the business of retail banking through ten branch offices located in Erie and Chautauqua Counties of New York State. Its primary deposit products are checking, savings and term certificate accounts and its primary lending products are commercial real estate loans and residential mortgages.

Organization and Nature of Operations

12 Months Ended

Dec. 31, 2025

Note–1 - Organization and Nature of Operations

Organizational Structure

Lake Shore Bancorp, Inc. (the “Company” or "Lake Shore Bancorp") is the parent holding company for Lake Shore Bank (the "Bank"). Lake Shore Bancorp, Inc., a federal corporation ("Lake Shore Federal Bancorp) and the former parent mutual holding company, Lake Shore, MHC (the “MHC”) were formed on April 3, 2006 to serve as the savings and loan holding companies for Lake Shore Savings Bank, upon Lake Shore Savings Bank’s initial conversion and reorganization from a New York State chartered mutual savings and loan association to the federal mutual holding company form of organization.

On July 18, 2025, Lake Shore Bancorp, Inc., a new corporation incorporated under the laws of the State of Maryland, became the bank holding company of Lake Shore Bank upon the completion of a "second-step" conversion (the "Conversion"). Pursuant to the Conversion, Lake Shore Savings Bank, a federally chartered savings bank, the wholly-owned subsidiary of Lake Shore Federal Bancorp, reorganized from the two-tier mutual holding company structure to the fully-public stock holding company structure. In addition, Lake Shore Savings Bank converted its charter from a federal savings bank to a New York commercial bank renamed Lake Shore Bank. The Conversion was consummated through the merger of Lake Shore, MHC with and into Lake Shore Federal Bancorp, followed by the merger of Lake Shore Federal Bancorp with and into Lake Shore Bancorp. In the subscription offering, Lake Shore Bancorp raised gross proceeds of $49.5 million by selling 4,950,460 shares of its common stock (approximately the midpoint of the offering range) at $10.00 per share to depositors of the Bank. The Company used $4.0 million of the proceeds to fund an addition to its Employee Stock Ownership Plan ("ESOP") loan for the acquisition of an additional 396,036 shares at $10.00 per share. Expenses incurred related to the offering were $2.3 million and have been recorded against offering proceeds.

As part of the Conversion transaction, outstanding shares of Lake Shore Federal Bancorp common stock owned by the public stockholders of Lake Shore Federal Bancorp (stockholders other than Lake Shore, MHC) as of July 18, 2025 were converted into shares of Lake Shore Bancorp's common stock based on an exchange ratio of 1.3549 shares of Lake Shore Bancorp's common stock for each share of Lake Shore Federal Bancorp common stock so that Lake Shore Federal Bancorp's existing public stockholders would own approximately the same percentage of Lake Shore Bancorp's common stock as they owned of Lake Shore Federal Bancorp's common stock immediately prior to the Conversion. A total of 7,825,501 shares of common stock were outstanding following the completion of the stock offering.

In connection with the Conversion, the Company established a liquidation account for the benefit of eligible and supplemental eligible account holders as defined in the Plan of Conversion and Reorganization of the MHC in an amount equal to the net worth of the Company as of the date of the latest consolidated balance sheet appearing in the final prospectus distributed in connection with the Conversion. The liquidation account will be maintained for the benefit of eligible account holders and supplemental eligible account holders who maintain their accounts at the Bank after the Conversion. The liquidation account will be reduced annually to the extent that such account holders have reduced their qualifying deposits as of each fiscal year end. Subsequent increases will not restore an account holder's interest in the liquidation account. In the event of a complete liquidation of the Company or the Bank, each such account holder will be entitled to receive balances for accounts then held.

Share and per share amounts related to periods prior to the date of Conversion (July 18, 2025) have been adjusted to give retroactive recognition to the exchange ratio applied in the Conversion (1.3549).

Charter

Lake Shore Bancorp, Inc. is regulated by the Federal Reserve Board and Lake Shore Bank, the wholly-owned subsidiary of Lake Shore Bancorp, Inc., is a New York State chartered commercial bank and regulated by New York Department of Financial Services ("NYSDFS") and the Federal Deposit Insurance Corporation (the “FDIC”).

Nature of Business

The Company’s primary business is the ownership and operation of its subsidiary, the Bank. The Bank is engaged primarily in the business of retail banking through ten branch offices located in Erie and Chautauqua Counties of New York State. Its primary deposit products are checking, savings and term certificate accounts and its primary lending products are commercial real estate loans and residential mortgages.