Mercantile Bank Q3 2026 Margin Widens as Costs Weigh on EPS

Mercantile Bank Corporation (NASDAQ: MBWM) reported higher third-quarter revenue and a wider net interest margin, but investments in employees and technology, nonrecurring costs and the timing of acquisition-related savings weighed on near-term profitability.

Revenue for the third quarter of 2026 increased more than 17% from a year earlier, while net income was approximately $24 million. Diluted earnings per share declined to $1.39 from $1.46 in the third quarter of 2025. Return on average assets was 1.4%, compared with 1.5% a year earlier, and return on average equity fell to 12.6% from 14.7%.

The Michigan-based bank, which had $7.2 billion in total assets, said 2026 remains a year of investment in people and technology. Those expenditures, together with one-time items and the timing of cost savings from its acquisition of Eastern Michigan Financial Corporation, partially offset revenue growth. The acquisition closed on Dec. 31, 2025.

Margin expands as funding costs decline

Mercantile’s fully tax-equivalent net interest margin rose to 3.73% from 3.49% in the year-earlier quarter and 3.59% in the second quarter of 2026. Net interest income increased to $61 million from $52 million a year earlier.

The bank attributed the margin performance to lower-cost deposits obtained through the Eastern Michigan acquisition, the repricing of fixed-rate assets and changes in its deposit mix. Its cost of funds declined to 1.79% from 2.25% a year earlier, while the yield on earning assets was 5.52%, compared with 5.74%.

As of Sept. 30, Mercantile had $58 million of fixed-rate commercial real estate loans scheduled to reprice during the remainder of 2026 at an average rate of 4.92%, along with $16 million of agency bonds carrying an average rate of 1.53%. Additional repricing opportunities in 2027 include $191.5 million of fixed-rate commercial real estate loans and $100 million of agency bonds.

Management’s interest-rate simulation indicated that net interest income would decline under lower-rate scenarios and increase if rates moved higher. A gradual 100-basis-point decrease was projected to reduce net interest income by 2.9%, while a 100-basis-point increase was projected to lift it by 2.7%.

Deposits outpace loan growth

Total deposits increased 17% from the end of the third quarter of 2025, reflecting both the Eastern Michigan transaction and organic growth. Deposits rose 6% during the third quarter, partly because of seasonal increases in public funds, while low- and no-cost deposits grew 8%.

The stronger deposit base reduced the quarter-end loan-to-deposit ratio to 88.3% from 95.9% a year earlier. Business and public-fund accounts represented 68% of deposits excluding brokered deposits at Sept. 30, while brokered deposits accounted for 0.4% of total deposits.

Commercial loans grew at a 2% annualized rate during the quarter and were 9% above the year-earlier level. The company said quarter-end balances were affected by late-quarter repayments and timing, while lending commitments increased to $589 million from $386 million a year earlier.

Total loans were $4.95 billion, including $4.07 billion of commercial loans. Commercial and industrial lending represented 30% of the total portfolio, while owner-occupied commercial real estate accounted for 15%. Together, those categories made up 55% of commercial loans. Non-owner-occupied commercial real estate represented 24% of total loans.

Credit metrics remain contained

Nonperforming assets were 0.14% of total assets at the end of the quarter, up from 0.09% at June 30 but below 0.16% a year earlier. Nonperforming loans increased to $9.7 million from $5.8 million in the second quarter and represented 0.20% of total loans.

Mercantile recorded net loan recoveries of $300,000, equal to 0.02% of average loans on an annualized basis, and a $700,000 provision for credit losses. The allowance for credit losses stood at $56.4 million, or 1.14% of loans. Past-due loans totaled $1.4 million, equivalent to three basis points of the portfolio.

The bank’s $1.16 billion non-owner-occupied commercial real estate portfolio included $375.4 million of industrial properties, $260.7 million of retail properties and $250.3 million of offices. All office exposure in that category was located in Michigan, and medical properties accounted for 33% of the office balance.

Technology and staffing lift expenses

Noninterest income benefited from higher activity across several fee categories. Compared with the third quarter of 2025, account service charges rose 33%, credit and debit card income increased 23%, mortgage banking income advanced 10%, and interest-rate swap income more than doubled. The bank linked higher treasury-management and card revenue to new commercial clients, marketing and increased usage.

Expenses increased as Mercantile recruited employees in Southeast Michigan, accrued higher performance and retention bonuses, expanded training and continued work on its core banking conversion and other technology updates. Salaries and benefits rose 27% year over year, data-processing costs increased 22%, and furniture and equipment expenses grew 20%. The efficiency ratio was 59.5%, compared with 55.7% a year earlier.

Capital levels remained above regulatory well-capitalized thresholds at both banking subsidiaries. The consolidated common equity Tier 1 ratio was 11.4%, compared with 11.3% a year earlier, while the total risk-based capital ratio was 14.6%, down from 14.9%. Tangible book value per share increased to $37.81 from $37.41.

Fourth-quarter expectations

For the fourth quarter, management expects annualized loan growth of 5% to 7%, a net interest margin of 3.75% to 3.85%, fee income of $10 million to $11 million and overhead costs of $42 million to $43 million. The overhead estimate excludes anticipated nonrecurring core-conversion costs. The company also expects a 17% federal tax rate, reflecting planned purchases of transferable energy tax credits, and assumes no changes in prime or Secured Overnight Financing Rate benchmarks.

Execution risks include integrating Mercantile and Eastern Michigan, realizing expected transaction savings, and completing the core and digital banking conversion without delays, cost overruns or disruption. The presentation also identified interest-rate changes, commercial real estate values, credit conditions, deposit behavior, cybersecurity threats and regulatory changes as factors that could cause actual results to differ from current expectations. The investment portfolio carried $78 million of pretax unrealized losses at Sept. 30, equal to 7% of its securities book value.