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Document And Entity Information - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Feb. 24, 2025 | Jun. 30, 2024
Cover [Abstract] |  |  |
Entity Registrant Name | PROSPERITY BANCSHARES, INC. |  |
Entity Central Index Key | 0001068851 |  |
Trading Symbol | PB |  |
Current Fiscal Year End Date | --12-31 |  |
Entity Filer Category | Large Accelerated Filer |  |
Entity Small Business | false |  |
Entity Emerging Growth Company | false |  |
ICFR Auditor Attestation Flag | true |  |
Document Financial Statement Error Correction [Flag] | false |  |
Entity Shell Company | false |  |
Document Type | 10-K |  |
Document Period End Date | Dec. 31, 2024 |  |
Document Fiscal Year Focus | 2024 |  |
Document Fiscal Period Focus | FY |  |
Amendment Flag | false |  |
Entity Well-known Seasoned Issuer | Yes |  |
Entity Current Reporting Status | Yes |  |
Entity Voluntary Filers | No |  |
Entity Common Stock, Shares Outstanding (in shares) |  | 95,262,717 |
Entity Public Float |  |  | $ 5,580
Entity File Number | 001-35388 |  |
Entity Tax Identification Number | 74-2331986 |  |
Entity Address, Address Line One | Prosperity Bank Plaza |  |
Entity Address, Address Line Two | 4295 San Felipe |  |
Entity Address, City or Town | Houston |  |
Entity Address, State or Province | TX |  |
Entity Address, Postal Zip Code | 77027 |  |
City Area Code | 281 |  |
Local Phone Number | 269-7199 |  |
Entity Interactive Data Current | Yes |  |
Title of 12(b) Security | Common stock, par value $1.00 per share |  |
Security Exchange Name | NYSE |  |
Entity Incorporation, State or Country Code | TX |  |
Document Annual Report | true |  |
Document Transition Report | false |  |
Auditor Name | Deloitte and Touche LLP |  |
Auditor Location | Houston, Texas |  |
Auditor Firm ID | 34 |  |
Documents Incorporated by Reference | Documents Incorporated by Reference: Portions of the Company’s Proxy Statement relating to the 2025 Annual Meeting of Shareholders, which will be filed within 120 days after December 31, 2024, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K. |  |
Auditor Opinion [Text Block] | Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Prosperity Bancshares, Inc. and subsidiaries (the "Company") as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, changes in shareholders' equity, and cash flows, for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America. We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2025 expressed an unqualified opinion on the Company's internal control over financial reporting. Basis for Opinion These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion. Critical Audit Matter The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates. Allowance for Credit Losses on Loans - Refer to Note 5 to the financial statements Critical Audit Matter Description The allowance for credit losses (“ACL”) on loans is a valuation allowance of expected credit losses on loans held for investment. All losses are charged to the allowance when the loss actually occurs or when a determination is made that such a loss is expected and reasonably estimable. Recoveries are credited to the allowance at the time of recovery. The Company’s allowance for credit losses on loans consists of two elements: (1) specific valuation allowances based on expected losses on impaired loans and purchased credit-deteriorated loans (“PCD Loans”); and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions and other qualitative risk factors both internal and external to the Company. In making its evaluation, management considers factors such as historical lifetime loan loss experience, the amount of nonperforming assets and related collateral, the volume, growth and composition of the portfolio, current economic conditions and reasonable and supportable forecasted economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the portfolio through its internal loan review process and other relevant factors. We identified the allowance for credit losses on loans as a critical audit matter because of the significant amount of judgment required by management when determining the economic factors, reasonable and supportable forecast, and management adjustments utilized in establishing the allowance. This required a high degree of auditor judgment and an increased extent of effort, including the need to involve our credit specialists. How the Critical Audit Matter Was Addressed in the Audit Our audit procedures related to the allowance for credit losses on loans included the following, among others: • We tested the effectiveness of controls over the (i) written policy in place for the calculation of the allowance, (ii) data input to the allowance calculation and (iii) management’s review of the adequacy of the allowance calculation, including the assumptions used in the calculation. • With the assistance of our credit specialists, we evaluated: • the methodology surrounding the reasonableness of economic factors and assumptions used in the general allowance calculation; • the reasonableness of the logic, statistical validity, and computations of the allowance for credit losses calculation. • We evaluated the appropriateness and relevance of the qualitative factors and related quantitative measures by comparing to external sources. • We tested the accuracy and evaluated the relevance of the historical loss data. • We tested the accuracy of the historical net charge offs. • We tested the arithmetic accuracy of the allowance calculation. |  |

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