Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 – Summary of Significant Accounting Policies Organization and Nature of Operations The Bank of Princeton (the “Bank”) was incorporated on March 5, 2007, under the laws of the State of New Jersey and is a New Jersey state-chartered banking institution. The Bank was granted its bank charter on April 17, 2007, commenced operations on April 23, 2007, and is a full-service bank providing personal and business lending and deposit services. As a state-chartered bank, the Bank is subject to regulation by the New Jersey Department of Banking and Insurance and the Federal Deposit Insurance Corporation (“FDIC”). The area served by the Bank, through its 35 branches, is generally an area within an approximate 50-mile radius of Princeton, NJ, including parts of Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Ocean, and Somerset Counties in New Jersey, and additional areas in portions of Philadelphia, Montgomery, and Bucks Counties in Pennsylvania. The Bank also has two retail branches and conducts loan origination activities in select areas of New York. The Bank offers traditional retail banking services, one-to-four-family residential mortgage loans, multi-family and commercial mortgage loans, construction loans, commercial business loans and consumer loans, including home equity loans and lines of credit. On January 10, 2023, Princeton Bancorp, Inc., a Pennsylvania corporation formed by the Bank (the “Company”), acquired all the outstanding stock of the Bank in a corporate reorganization. As a result, the Bank became the sole direct subsidiary of the Company, the Company became the holding company for the Bank and the stockholders of the Bank became stockholders of the Company. As of March 31, 2026, the Company and its subsidiaries had 242 total employees and 241 full-time equivalent employees. On August 23, 2024, the Company completed the acquisition of Cornerstone Financial Corporation (“CFC”), the holding company for Cornerstone Bank, a New Jersey chartered state bank headquartered in Mt. Laurel, New Jersey that primarily served the South Jersey market. On that date, CFC was merged into the Company, and Cornerstone Bank was merged with and into the Bank. Basis of Financial Statement Presentation The unaudited consolidated financial statements include the accounts of the Company, its wholly owned subsidiary, the Bank, and the Bank’s wholly owned subsidiaries: Bayard Lane, LLC, Bayard Properties, LLC, 112 Fifth Avenue, LLC, TBOP Delaware Investment Company and TBOP REIT, Inc. All significant inter-company accounts and transactions have been eliminated in consolidation. The unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission and the FDIC. Accordingly, they do not include all the information and disclosures required by GAAP for annual financial statements. In management’s opinion, the unaudited consolidated financial statements contain all adjustments, which include normal and recurring adjustments necessary for a fair presentation of the financial position and results of operations for the interim periods presented. The results of operations reported for interim periods are not necessarily indicative of the results of operations for the entire year or any subsequent interim period. These unaudited consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Because of uncertainties associated with estimating the amounts, timing and likelihood of possible outcomes, actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses and evaluation of the potential impairment of goodwill. Management believes that the allowance for credit losses is adequate as of March 31, 2026. While management uses current information to recognize losses on loans, future additions to the allowance for credit losses may be necessary based on changes in economic conditions in the market area or other factors. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for credit losses. Such agencies may require the Company to effect certain changes that result in additions to the allowance based on their judgments about information available to them at the time of their examinations. Note 1 – Summary of Significant Accounting Policies (continued) Segment Reporting The Company has determined that all of its banking divisions and subsidiaries meet the aggregation criteria of Accounting Standards Codification (ASC) 280, Segment Reporting, as its current operating model is structured whereby banking divisions and subsidiaries serve a similar customer base utilizing a company-wide offering of similar products and services managed through similar processes and platforms that are collectively reviewed by the Company’s Chief Executive Officer, who has been identified as the chief operating decision maker (“CODM”). The CODM regularly assesses performance of the aggregated single operating and reporting segment and decides how to allocate resources based on net income calculated on the same basis as is net income reported in the Company’s consolidated statements of income. The CODM is also regularly provided with expense information at a level consistent with that disclosed in the Company’s consolidated statements of income. Reclassifications Certain amounts in the prior year consolidated financial statements have been reclassified to conform to the current year’s presentation. Recent Accounting Pronouncements Not Yet Adopted ASU 2023-06, “Disclosure Improvements” amends disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The effective dates will depend, in part, on whether an entity is already subject to the SEC’s current disclosure requirements. This ASU is not expected to have a material impact on the Company’s consolidated financial statements. ASU 2025-08, “Financial Instruments—Credit Losses: Purchased Loans,” expands the gross‑up approach for the allowance for credit losses to certain purchased seasoned loans. The amendments are effective for fiscal years beginning after December 15, 2026, are applied prospectively, and early adoption is permitted. The Company is currently evaluating the impact and does not expect adoption to have a material impact on its consolidated financial statements.

The Bank of Princeton (the “Bank”) was incorporated on March 5, 2007, under the laws of the State of New Jersey and is a New Jersey state-chartered banking institution. The Bank was granted its bank charter on April 17, 2007, commenced operations on April 23, 2007, and is a full-service bank providing personal and business lending and deposit services. As a state-chartered bank, the Bank is subject to regulation by the New Jersey Department of Banking and Insurance and the Federal Deposit Insurance Corporation (“FDIC”). The area served by the Bank, through its 35 branches, is generally an area within an approximate 50-mile radius of Princeton, NJ, including parts of Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Ocean, and Somerset Counties in New Jersey, and additional areas in portions of Philadelphia, Montgomery, and Bucks Counties in Pennsylvania. The Bank also has two retail branches and conducts loan origination activities in select areas of New York.

The Bank offers traditional retail banking services, one-to-four-family residential mortgage loans, multi-family and commercial mortgage loans, construction loans, commercial business loans and consumer loans, including home equity loans and lines of credit.

On January 10, 2023, Princeton Bancorp, Inc., a Pennsylvania corporation formed by the Bank (the “Company”), acquired all the outstanding stock of the Bank in a corporate reorganization. As a result, the Bank became the sole direct subsidiary of the Company, the Company became the holding company for the Bank and the stockholders of the Bank became stockholders of the Company. As of March 31, 2026, the Company and its subsidiaries had 242 total employees and 241 full-time equivalent employees.

On August 23, 2024, the Company completed the acquisition of Cornerstone Financial Corporation (“CFC”), the holding company for Cornerstone Bank, a New Jersey chartered state bank headquartered in Mt. Laurel, New Jersey that primarily served the South Jersey market. On that date, CFC was merged into the Company, and Cornerstone Bank was merged with and into the Bank.

Basis of Financial Statement Presentation

The unaudited consolidated financial statements include the accounts of the Company, its wholly owned subsidiary, the Bank, and the Bank’s wholly owned subsidiaries: Bayard Lane, LLC, Bayard Properties, LLC, 112 Fifth Avenue, LLC, TBOP Delaware Investment Company and TBOP REIT, Inc. All significant inter-company accounts and transactions have been eliminated in consolidation.

The unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission and the FDIC. Accordingly, they do not include all the information and disclosures required by GAAP for annual financial statements. In management’s opinion, the unaudited consolidated financial statements contain all adjustments, which include normal and recurring adjustments necessary for a fair presentation of the financial position and results of operations for the interim periods presented. The results of operations reported for interim periods are not necessarily indicative of the results of operations for the entire year or any subsequent interim period. These unaudited consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Because of uncertainties associated with estimating the amounts, timing and likelihood of possible outcomes, actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses and evaluation of the potential impairment of goodwill.

Management believes that the allowance for credit losses is adequate as of March 31, 2026. While management uses current information to recognize losses on loans, future additions to the allowance for credit losses may be necessary based on changes in economic conditions in the market area or other factors.

In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for credit losses. Such agencies may require the Company to effect certain changes that result in additions to the allowance based on their judgments about information available to them at the time of their examinations.

Segment Reporting

The Company has determined that all of its banking divisions and subsidiaries meet the aggregation criteria of Accounting Standards Codification (ASC) 280, Segment Reporting, as its current operating model is structured whereby banking divisions and subsidiaries serve a similar customer base utilizing a company-wide offering of similar products and services managed through similar processes and platforms that are collectively reviewed by the Company’s Chief Executive Officer, who has been identified as the chief operating decision maker (“CODM”).

The CODM regularly assesses performance of the aggregated single operating and reporting segment and decides how to allocate resources based on net income calculated on the same basis as is net income reported in the Company’s consolidated statements of income. The CODM is also regularly provided with expense information at a level consistent with that disclosed in the Company’s consolidated statements of income.

Recent Accounting Pronouncements Not Yet Adopted

ASU 2023-06, “Disclosure Improvements” amends disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The effective dates will depend, in part, on whether an entity is already subject to the SEC’s current disclosure requirements. This ASU is not expected to have a material impact on the Company’s consolidated financial statements.

ASU 2025-08, “Financial Instruments—Credit Losses: Purchased Loans,” expands the gross‑up approach for the allowance for credit losses to certain purchased seasoned loans. The amendments are effective for fiscal years beginning after December 15, 2026, are applied prospectively, and early adoption is permitted. The Company is currently evaluating the impact and does not expect adoption to have a material impact on its consolidated financial statements.