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Acquisitions | 9 Months Ended
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Sep. 30, 2025
Business Combination [Abstract] |
Acquisitions | 12. ACQUISITIONS Recent Acquisition Acquisition of Lone Star State Bancshares, Inc. — Effective April 1, 2024, the Company completed the merger of Lone Star into Bancshares and the subsequent merger of its wholly owned subsidiary, Lone Star Bank into the Bank (collectively, the “Lone Star Merger”). Lone Star Bank operated five full-service banking offices in the West Texas area, including its main office in Lubbock, and one banking center in each of Brownfield, Midland, Odessa and Big Spring, Texas. As of March 31, 2024, Lone Star, on a consolidated basis, reported total assets of $1.38 billion, total loans of $1.08 billion and total deposits of $1.24 billion. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included. Pursuant to the terms of the definitive agreement, Bancshares issued 2,376,182 shares of its common stock plus approximately $64.1 million in cash for all outstanding shares of Lone Star. This resulted in goodwill of $106.7 million as of September 30, 2025, which reflected all final subsequent fair value adjustments. Goodwill represents the excess of the total purchase price paid over the fair value of the assets acquired, net of the fair value of liabilities assumed. Additionally, the Company recognized $17.7 million of core deposit intangibles related to the Lone Star Merger. In October 2024, the Company completed the operational conversion of Lone Star Bank. Pending Acquisition Agreement to Acquire American Bank Holding Corporation — On July 18, 2025, Bancshares and American Bank Holding Corporation (“American”) jointly announced the signing of a definitive merger agreement (the “Prosperity/American Merger Agreement”) whereby American, a Texas corporation and bank holding company of American Bank, N.A. (“American Bank”), will merge with and into Bancshares and American Bank will merge with and into the Bank (collectively, the “American Merger”). American Bank operates eighteen banking offices and two loan production offices in South and Central Texas including its main office in Corpus Christi, and banking offices in San Antonio, Austin, Victoria and the greater Corpus Christi area including Port Aransas and Rockport and a loan production office in Houston, Texas. As of June 30, 2025, American, on a consolidated basis, reported total assets of $2.55 billion, total loans of $1.80 billion and total deposits of $2.29 billion. Pursuant to the terms of the Prosperity/American Merger Agreement, Bancshares will issue 4,439,981 shares of its common stock for all outsta nding shares of American common stock, subject to certain potential adjustments. Based on Bancshares’ closing price of $72.40 on July 16, 2025, the total consideration was valued at approximately $321.5 million. Bancshares has received all necessary regulatory approvals fo r the acquisition of American, and the shareholders of American approved the transaction on November 3, 2025. The transaction is expected to be completed on January 1, 2026, subject to the satisfaction or waiver of the remaining customary closing conditions set forth in the Prosperity/American Merger Agreement.

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