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Capital Stock
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Capital Stock
The Company’s common stock is traded on the NASDAQ stock market under the symbol “FIBK.”
As of September 30, 2025, the Company is authorized to issue an aggregate of 150,100,000 shares of capital stock, of which 150,000,000 shares are designated as common stock, and 100,000 are designated as preferred stock. Our common stock is uncertificated and has one vote per share.
The Company had 103,967,257 shares and 104,585,964 shares of common stock outstanding as of September 30, 2025 and December 31, 2024, respectively, and no shares of preferred stock outstanding as of September 30, 2025 and December 31, 2024.
During the nine months ended September 30, 2025, the Company issued 39,058 restricted stock units to directors for their annual service on the Company's board of directors. The aggregate value of the restricted stock units issued to directors of $1.1 million is amortized into stock-based compensation expense in the accompanying consolidated statements of changes in stockholders’ equity over a one-year service-based period.
On August 28, 2025, the board of directors of the Company adopted a new stock repurchase program, pursuant to which the Company has been authorized to repurchase up to $150.0 million of its issued and outstanding shares of common stock on or prior to March 31, 2027, which is the expiration date of the program. Any repurchased shares will be returned to authorized but unissued shares of common stock, as permitted under applicable Delaware law.
During the three and nine months ended September 30, 2025, 842,903 shares of common stock were repurchased under the new stock repurchase program at a total cost of $27.5 million or at a weighted average price of $32.58 per share. As of September 30, 2025, following these repurchases, approximately $122.5 million remained available for future purchases under the program. The additional stock repurchases during the three and nine months ended September 30, 2025 and 2024, were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants in the Company’s equity compensation plans.