Prosperity Bancshares Leverages Aggressive M&A to Boost Margins Amid Record Charge‑Offs

David Zalman, senior chairman and CEO, opened the call by underscoring the “impactful” nature of the quarter. The bank closed the American Bank Holding Corporation deal on Jan. 1 and the Southwest Bancshares acquisition on Feb. 1, and secured regulatory clearance for the pending Stellar Bancorp merger, slated for July 1.

“We are doing the right thing,” Zalman said, pointing to the bank’s recent accolades—Forbes’ America’s Best Banks for the 14th straight year and a top‑15 finish in S&P Global’s public‑bank ranking.

The balance sheet swelled dramatically. Loans rose 15.1% to $25.2 billion, driven largely by the two completed deals, while deposits jumped 16.4% to $32.6 billion. Excluding merger‑related loan additions, organic loan growth actually slipped 1.2% YoY, a modest decline that Zalman framed as “expected runoff” after a wave of acquisitions.

Core deposits, the bank’s low‑cost engine, grew 1.2% on a standalone basis, keeping the cost of funds at 1.45% and the cost of deposits at 1.32%—both modestly better than a year ago.

Profitability metrics reflected the mixed picture. Net income fell 11% to $116 million, and diluted EPS dropped to $1.16 from $1.37 a year earlier. However, after stripping the $42.5 million merger expense, adjusted net income rose to $149.9 million, translating to $1.50 per share—a 9.5% improvement over the prior year’s adjusted figure.

“We are excited about the margin expansion,” CFO Asylbek Osmonov said, noting that net‑interest income before credit‑loss provisions climbed $55.8 million to $321.2 million, and the net‑interest margin (NIM) on a tax‑equivalent basis rose 37 basis points to 3.51% versus 3.14% a year ago. The gain stemmed from “repricing of earning assets” and the higher‑yield loan mix added by the American and Southwest banks.

Non‑interest income also edged higher to $46.5 million, but non‑interest expense ballooned to $217.3 million—up $78.6 million—mainly because of the $42.5 million merger‑related outlay and integration costs.

The resulting efficiency ratio jumped to 59.2% from 45.7% a year earlier; excluding merger costs the ratio would have been 47.6%, a figure closer to the bank’s historical mid‑40s target. Osmonov indicated that “mid‑40s” efficiency is achievable once the integration synergies from American, Southwest and Stellar materialize, projecting Q2 non‑interest expense of $176‑$180 million.

Asset quality remained solid despite the record charge‑off. Non‑performing assets fell to $122 million (33 bps of average interest‑earning assets) from $151 million a quarter earlier, and the allowance for credit losses rose to $421 million, reflecting $90 million of merger‑related reserves.

The $41 million net charge‑off—primarily two large, syndicated credits from the Dallas office—was described as “unique in nature” and not indicative of a broader trend. “Both loans were shared national credits… we do not expect a repeat,” said Tim Timanus, chief lending officer. The bank’s overall allowance as a percentage of total loans improved to 1.61% from 1.67% a year ago.

Management used the Q&A to signal confidence in future margin trajectory. When asked about NIM guidance, Osmonov said the bank expects a “flat to slightly higher” margin in Q2, noting that the $4 million of loan income from non‑accrual loans in Q1 was a one‑off.

Incorporating Stellar, the combined entity is projected to finish 2026 with an average NIM of about 3.60% and exit the year near 3.70%. The CFO added that the newly acquired bond portfolio—about $1.4 billion at yields between 4.50% and 4.85%—should continue to enhance net interest income.

Competition in Texas, the bank’s core market, was a recurring theme. Analyst Manan Gosalia pressed on the “cooling labor market” and “out‑of‑state banks” offering higher deposit rates. Zalman replied that Texas still offers “steady growth” and that the bank prefers to win business on relationship value rather than “underpricing” to the point of margin erosion.

He also disclosed a plan to set aside $750 million‑$1 billion of commitment capacity to compete for large construction deals, acknowledging that “we have missed out on some deals” but will protect profitability by avoiding “dry relationships.”

Capital strength and shareholder returns were highlighted as well. The bank repurchased roughly 837,000 shares at $68.15, spending $57 million in Q1, and signaled continued buy‑backs “when the price is an opportunity.” The Basel III end‑game is expected to add about 50 bps to capital ratios, according to Osmonov, providing further headroom for dividends and repurchases.

Looking ahead, integration timelines dominate the agenda: operational rollout for American Bank is slated for September, Southwest for November, and Stellar’s full systems integration by March 2027. Zalman emphasized that “the focus is on bringing these three deals together” before pursuing additional acquisitions, a stance echoed by analysts who probed the risk of loan runoff from Stellar. Kevin Hanigan cautioned that “run‑off is typical after acquisitions” and that the bank expects low‑to‑mid‑single‑digit organic loan growth once the dust settles.

The market reacted modestly. PB shares traded at $68.83, down 0.94% on the day and 1.36% for the week, still 10.8% below the 52‑week high. The modest price dip reflects investor caution over the charge‑off and integration costs, even as the upside from margin expansion and scale‑driven cost efficiencies remains compelling.

Overall, Prosperity Bancshares used Q1 2026 to cement a $54 billion platform, lift earnings per share after merger adjustments, and set a clear path to higher net‑interest margins. The next six months will test whether the bank can translate its expanded footprint into sustainable loan growth while keeping credit losses in check.