FIBK’s Third Quarter 2026: Net Interest Margin Improves, Deposits Dip, and Capital Management Gets Squarer

Overview

First Interstate BancSystem, Inc. (NASDAQ: FIBK) reported third-quarter 2026 results showing net income of $62.2 million and diluted earnings per share of $0.65. Those figures compare with $83.9 million and $0.87 in the second quarter of 2026, and $71.4 million and $0.69 in the third quarter of 2025. The sequential quarter included a $19.5 million gain related to the sale of eleven Nebraska branches, a notable item that helps explain some of the delta versus the prior quarter.

Key Financial Highlights

The company’s net interest margin rose to 3.53% in Q3 2026, marking an 8-basis-point increase from Q2 2026 and a 19-basis-point improvement versus Q3 2025. In an environment where margin pressure is a common narrative, this uptick is worth watching as a potential signal of better net interest income leverage as loan balances drift lower and deposit mix stabilizes.

Asset quality remained generally favorable, with non-performing assets at $155.0 million as of September 30, 2026, down from $165.0 million at June 30, 2026 and well off the $185.6 million recorded on September 30, 2025. Criticized loans edged higher to $939.5 million as of September 30, 2026 from $937.4 million at June 30, 2026, but remained below the $1.164 billion level from a year earlier.

Net charge-offs rose to $9.9 million for the quarter, up from $9.7 million in Q2 2026, and up from $2.3 million in Q3 2025. This translates to an annualized 0.28% of average loans as of September 30, 2026 (0.27% at June 30, 2026; 0.06% as of September 30, 2025).

Deposit dynamics were modestly negative on a sequential basis, with total deposits of $21,388.5 million as of September 30, 2026, down from $21,441.3 million at June 30, 2026. The quarterly fluctuation occurred across interest-bearing deposits, with offsetting trends in non-interest-bearing deposits. On the year, deposits declined by about $1.216 billion versus September 30, 2025, largely reflecting the impact of branch sales completed in late 2025 and during 2026.

Capital Management and Corporate Actions

During the third quarter, the Company repurchased approximately 2.04 million shares for $76.3 million. In total, First Interstate has repurchased about 10.02 million shares for roughly $346.6 million since the authorization was adopted in August 2025. As of September 30, 2026, approximately $103.4 million remained available under the $450 million program.

The Common Equity Tier 1 capital ratio declined 18 basis points in the quarter to 14.36% from 14.54% in the prior quarter, primarily driven by share repurchases, with a partial offset from lower risk-weighted assets driven by lower loan balances in the period.

Leadership Moves and Dividend Declared

In organizational news, Jeff Lee was appointed Executive Vice President and Chief Operations Officer, effective September 14, 2026. On October 21, 2026, the board declared a dividend of $0.47 per share, payable November 13, 2026, to stockholders of record as of November 3, 2026. At the reported average closing price of $37.82 during the third quarter of 2026, the dividend implies a yield near 5.0% on a trailing basis.

CEO James A. Reuter commented on the quarter, noting meaningful improvement in net interest margin and a rise in non-interest bearing deposits, while underscoring ongoing efforts to strengthen the franchise’s earnings power. The tone aligns with a management emphasis on capital deployment, efficiency, and relationship growth as levers for future profitability.

Analyst Read: What This Could Signal for FIBK and Peers

The EPS print at $0.65 sits below the Q2 result and well below the $0.87 peak from the prior quarter, a reminder that quarterly EPS can swing on one-time items and deposit dynamics. Importantly, there is no explicit EPS consensus or revenue forecast in the filings, which means market expectations are likely to be inferred from the quarter’s core operating trends rather than a formal forward-looking guidance page. In that sense, the report nudges investors to read into margin trajectories and credit quality as a better proxy for the next few quarters than a traditional earnings beat or miss narrative.

Higher net interest margin supports a constructive read on NIM expansion for this cohort of regional banks, particularly those with exposure to mid-teens to mid-20s loan balances and a strategic focus on cost efficiency. The deposit decline, driven by branch dispositions, is a shared risk—funding base volatility can compress earnings if loan growth slows or if rate environments shift again. Yet, the partial offset from lower risk-weighted assets suggests disciplined balance sheet management, which could be a characteristic among sector peers with similar strategic exits or portfolio simplifications.

Capital discipline remains evident through the sizable buyback activity and the maintained dividend. The CET1 erosion from share repurchases is a classic dilemma: you give up a bit of regulatory cushion to buy stock now, hoping the equity remains supported by earnings power and risk-weighted asset reductions. For sector peers, the lesson may be: if you can responsibly shrink the balance sheet or streamline exposures while preserving capital and returning cash to shareholders, you preserve optionality in a slower-growth environment.

Bottom Line and Takeaways

• Q3 2026 EPS of $0.65, with a margin that hints at better beginning-to-middle innings for net interest income.
• Credit quality remains manageable, though net charge-offs ticked up modestly; non-performing assets track lower versus a year ago.
• Deposit volatility persists, a common theme among banks that completed or plan branch divestitures; the funding base will be watched closely by investors and regulators.
• Capital discipline continues through share repurchases and a steady dividend, even as CET1 dips modestly due to those buybacks.
• For FIBK and peers, margin resilience and disciplined capital management may become the real differentiators as rate cycles evolve and strategic actions shape the balance sheets.