Basis of Presentation	9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1. BASIS OF PRESENTATION The consolidated financial statements include the accounts of Prosperity Bancshares, Inc.® (“Bancshares”) and its wholly-owned subsidiary, Prosperity Bank® (the “Bank,” and together with Bancshares, the “Company”). All intercompany transactions and balances have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for financial information and with the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis; and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. Operating results for the nine-month period ended September 30, 2025, are not necessarily indicative of the results that may be expected for the year ending December 31, 2025, or any other period. The Company’s banking operations are considered by management to be aggregated in one reportable operating segment in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 280. The Chief Executive Officer is designated as the Company’s chief operating decision maker (“CODM”), who evaluates banking operations and decides how to allocate resources based on consolidated net income that is also reported on the Company’s consolidated statement of income. Consolidated net income is used to monitor the Company’s revenue streams, significant expenses and to compare budget to actual results in assessing performance of the Company’s banking operations. Interest expense, provision for credit losses and salaries and employee benefits are considered significant segment expenses and are listed on the accompanying consolidated statements of income. As the Company’s operations consist of one reportable operating segment, the segment assets are reflected on the accompanying consolidated balance sheets as “total assets.”

Basis of Presentation

9 Months Ended

Sep. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. BASIS OF PRESENTATION

The consolidated financial statements include the accounts of Prosperity Bancshares, Inc.® (“Bancshares”) and its wholly-owned subsidiary, Prosperity Bank® (the “Bank,” and together with Bancshares, the “Company”). All intercompany transactions and balances have been eliminated.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for financial information and with the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis; and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. Operating results for the nine-month period ended September 30, 2025, are not necessarily indicative of the results that may be expected for the year ending December 31, 2025, or any other period.

The Company’s banking operations are considered by management to be aggregated in one reportable operating segment in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 280. The Chief Executive Officer is designated as the Company’s chief operating decision maker (“CODM”), who evaluates banking operations and decides how to allocate resources based on consolidated net income that is also reported on the Company’s consolidated statement of income. Consolidated net income is used to monitor the Company’s revenue streams, significant expenses and to compare budget to actual results in assessing performance of the Company’s banking operations. Interest expense, provision for credit losses and salaries and employee benefits are considered significant segment expenses and are listed on the accompanying consolidated statements of income. As the Company’s operations consist of one reportable operating segment, the segment assets are reflected on the accompanying consolidated balance sheets as “total assets.”