First Interstate BancSystem Q1 2026: Margin Uplift, Deposits Drift, and a Bold Buyback Beat

Executive snapshot

First Interstate BancSystem produced a Q1 2026 earnings snapshot that feels less like a sprint and more like a measured jog uphill—net income of $60.2 million, or $0.61 per diluted share, versus $108.8 million and $1.08 in the prior quarter (Q4 2025). Year over year, the EPS line softens a bit from the $0.49 posted in Q1 2025, but the quarter-to-quarter delta highlights a bank that’s extracting more from its balance sheet even as the revenue card doesn’t magically multiply.

The press release emphasizes a 3.41% net interest margin in Q1 2026, a 5-basis-point improvement from Q4 2025 and a 22-basis-point improvement from Q1 2025. In a world where margin management can be the difference between “earnings engine” and “marginal engine,” that lift is material, even if it doesn’t fully paper over the sequential earnings decline.

Key operating highlights

• Net interest margin up to 3.41% in Q1 2026 (up 5 bps QoQ; up 22 bps YoY).
• Other borrowed funds were zero as of March 31, 2026, versus a material balance a year earlier, illustrating a tighter liquidity posture as deposits drift lower.
• Net charge-offs declined to $2.4 million, an annualized 0.06% of average loans, vs. $22.1 million in the prior quarter and down meaningfully from early-2025 levels.
• Non-performing assets rose to $162.5 million as of March 31, 2026, reflecting ongoing asset-quality scrutiny as the bank manages a lower loan balance base.
• Deposits totaled $21,883.0 million as of March 31, 2026, down from year-end 2025 levels, underscoring ongoing funding dynamics in a competitive deposit landscape.
• Share repurchases resumed with 2.39 million shares bought for about $84.0 million in Q1 2026; cumulative repurchases through December 31, 2025 amounted to ~3.65 million shares for ~$117.6 million. The board authorized an additional $150.0 million in January 2026, increasing total authorization to $300.0 million.
• Common equity tier 1 capital ratio at 14.30%, reflecting capital discipline even as share repurchases press on.

Dividend and capital actions

The board declared a quarterly dividend of $0.47 per common share, payable May 21, 2026, to stockholders of record as of May 11, 2026. At an average closing price of $35.76 in the first quarter, this implies a roughly 5.3% annualized yield—a reminder that banks can blend margin work with managed shareholder returns in a single quarter.

Leadership commentary and what it could portend

CEO James A. Reuter frames the quarter as a sign of underlying momentum: “We are pleased to see continued improvement in our net interest margin and continue to execute on our previously announced share repurchase authorization.” The rhetoric is calm, the tone remains confident, and the math lines up with a strategy you could call “lend with discipline, fund with deposits, reward with reps.”

From a portfolio-management perspective, the NIM lift matters. In a rate environment that can morph from press conference to pressures on margins, a 3.41% NIM suggests the bank is extracting value from asset yields while managing the cost of funding. The zero balance in other borrowed funds hints at a more conservative liquidity stance, which is sensible but not glamorous in quarters where liquidity needs can bite if deposits erode further.

What this might portend for the sector

For peers, a few signals emerge: margin resilience remains possible even as traditional deposit bases shift. Banks with a deliberate buyback cadence and a clear capital plan could maintain upside in their equity bases, particularly when CET1 ratios sit in the high teens or low teens and stock-based compensation and reserve releases aren’t masking the core earnings story.

Asset quality remains a watchpoint. The drop in net charge-offs is encouraging, but non-performing assets show that deterioration or remediation cycles can surface in pockets, especially when deposits compress and loan portfolios re-price. The trend in non-interest income, fee ecosystems, and expense discipline will also influence whether Q2 and Q3 earnings surprise the market—or merely align with cautious guidance.

Notes on the earnings vocabulary and what to watch

This article uses familiar earnings terms—ticker FIBK, EPS, earnings surprise, EPS consensus, revenue forecast, and related metrics—to benchmark against peer banks. In this filing, EPS is reported as $0.61 for Q1 2026; the company does not publish a formal EPS consensus in the release, so there is no explicit earnings surprise relative to a published street expectation. There is also no forward-looking revenue forecast disclosed in the press release, meaning investors will rely on internal model dynamics and subsequent quarterly commentary for near-term guidance.

As with any quarterly report, the real signal isn’t a single beat or miss but the trajectory of margin expansion, asset-quality normalization, capital flexibility (CET1 at 14.3%), and the cadence of capital returns. Those pieces, together, help explain why FIBK’s stock might trade with a premium to peers that can’t demonstrate the same margin resilience or capital discipline.

Bottom line

First Interstate’s Q1 2026 results illustrate a bank managing the tricky balance of improving net interest margin, stabilizing credit costs, and returning capital while deposits drift and liquidity posture tightens. The combination—modest top-line buoyancy from NIM, a lean credit profile, and an assertive buyback/dividend program—sets up a narrative where the stock is less about a one-quarter narrative and more about the trajectory for the rest of the year. Sector peers will likely watch this playbook: squeeze margin discipline from yields, preserve capital, and keep the buyback engine warm for when the revenue forecast and deposit environment align with stronger growth expectations.