First Interstate BancSystem operates a $26 billion regional banking franchise across twelve western and midwestern states, generating revenue through traditional spread lending and fee-based services including wealth management, payment processing, and treasury services. The company has spent the past eighteen months reshaping its footprint through deliberate branch divestitures, selling Arizona and Kansas operations in late 2025 followed by eleven Nebraska branches in mid-2026, which produced a combined $82 million in pre-tax gains but also reduced the earning asset base.
Net interest margin expanded twenty-eight basis points to 3.30 percent in 2025 as funding costs declined faster than asset yields, yet the most recent quarter shows that dynamic reversing: net interest income fell 2.4 percent year-over-year in Q2 2026 as loan balances contracted fifteen percent from their peak and deposit costs stabilized. Credit quality remains benign with criticized assets improving and the allowance for credit losses declining to $182 million, but the provision could normalize from its current low level. The stock trades at 11.5 times trailing earnings and 13 times forward estimates, a discount to regional peers that reflects the market's skepticism about sustainable earnings power once the one-time gains are absorbed. The investment case hinges on whether margin stabilization and expense discipline can offset the revenue headwinds from a shrinking balance sheet, and whether the freed capital gets deployed into share repurchases or higher-yielding assets.