| 2026-09-16 | 8-K | 10.1 | Employment Agreement |
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| 2026-08-03 | 10-Q | 10.2 | Amended and Restated Deferred Compensation Plan of the Company |
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| 2026-05-13 | 8-K | 10.1 | Transition and Separation Agreement. |
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| 2026-02-26 | 10-K | 10.24 | Employment Agreement, dated April 22, 2025, between Nathan R. Jones, the Company and the Bank |
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| 2026-02-26 | 10-K | 10.17 | Company Director Compensation Summary |
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| 2026-02-26 | 10-K | 10.16 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (2026 Core Return on Average Tangible Common Equity) |
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| 2026-02-26 | 10-K | 10.15 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (2026 Total Shareholder Return) |
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| 2026-02-26 | 10-K | 10.14 | Form of 2023 Equity and Incentive Plan Restricted Stock Unit Grant Agreement (2026) |
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| 2025-11-18 | 8-K | 10.2 | Employment Agreement |
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| 2025-11-18 | 8-K | 10.1 | Agreement. |
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| 2025-08-06 | 10-Q | 10.2 | Form of 2023 Equity and Incentive Plan Restricted Stock Unit Grant Agreement (2025 Non-Employee Directors). |
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| 2025-06-02 | 8-K | 10.1 | Employment Agreement by and between David P. Della Camera, First Interstate BancSystem, Inc. and First Interstate Bank, effective June 1, 2025. |
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| 2025-02-28 | 10-K | 10.14 | Company Director Compensation Summary |
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| 2025-02-28 | 10-K | 10.12 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (2025 Core Return on Average Tangible Common Equity) |
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| 2025-02-28 | 10-K | 10.2 | Deferred Compensation Plan of the Company |
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| 2025-02-25 | 8-K | 10.1 | Transition Agreement |
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| 2024-11-04 | 10-Q | 10.2 | First Amendment to the Transition and Separation Agreement and General Release by and between Kevin P. Riley, First Interstate BancSystem, Inc. and First Interstate Bank, effective October 8, 2024 |
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| 2024-10-09 | 8-K | 10.1 | Employment Agreement by and among James Reuter, First Interstate BancSystem Inc. and First Interstate Bank, dated as of October 9, 2024. |
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| 2024-08-02 | 10-Q | 10.3 | Transition and Separation Agreement by and between Kevin P. Riley, First Interstate BancSystem, Inc. and First Interstate Bank, effective July 8, 2024 |
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| 2024-02-29 | 10-K | 10.23 | Executive Employment Agreement, dated January 23, 2023, between the Company and Kris Robbins |
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| 2024-02-29 | 10-K | 10.18 | Company Director Compensation Summary |
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| 2024-02-29 | 10-K | 10.17 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (Total Shareholder Return) with Executive Deferral Election |
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| 2024-02-29 | 10-K | 10.16 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (Core Return on Average Equity) with Executive Deferral Election |
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| 2024-02-29 | 10-K | 10.15 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (Total Shareholder Return) |
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| 2024-02-29 | 10-K | 10.14 | Form of 2023 Equity and Incentive Plan Performance Restricted Stock Unit Grant Agreement (Core Return on Average Equity) |
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| 2024-02-29 | 10-K | 10.13 | Form of 2023 Equity and Incentive Plan Restricted Stock Unit Grant Agreement with Executive Deferral Election |
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| 2024-02-29 | 10-K | 10.12 | Form of 2023 Equity and Incentive Plan Restricted Stock Unit Grant Agreement (2024) |
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| 2023-12-14 | 8-K | 10.1 | Repurchase Agreement. |
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| 2023-12-01 | 8-K | 10.1 | Employment Agreement by and between Lori Meyer, First Interstate BancSystem, Inc. and First Interstate Bank, effective November 30, 2023. |
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| 2023-08-28 | 8-K | 10.1 | Employee Agreement by and between Lorrie Asker, First Interstate BancSystem, Inc. and First Interstate Bank, effective August 24, 2023. |
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| 2023-05-25 | 8-K | 10.3 | EX-10.3 - FORM OF PRSU GRANT AGREEMENT |
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| 2023-05-25 | 8-K | 10.2 | EX-10.2 - FORM OF RSU GRANT AGREEMENT |
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| 2023-02-24 | 10-K | 10.9 | Company Director Compensation Summary |
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| 2022-08-05 | 10-Q | 10.2 | Executive Change In Control Separation Agreement, dated May 30, 2022, between the Company and Gary Lorenz |
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| 2022-08-05 | 10-Q | 10.1 | Executive Change In Control Separation Agreement, dated May 30, 2022, between the Company and Kristina Robbins |
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| 2022-02-25 | 10-K | 10.19 | Executive Employment Agreement, dated December 14, 2021, between the Company and Russell A. Lee |
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| 2022-02-25 | 10-K | 10.18 | Executive Employment Agreement, dated February 1, 2022, between the Company and Karlyn M. Knieriem |
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| 2022-02-25 | 10-K | 10.17 | Executive Employment Agreement, dated February 1, 2022, between the Company and Scott E. Erkonen |
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| 2022-02-25 | 10-K | 10.16 | Executive Employment Agreement, dated December 14, 2021, between the Company and Philip G. Gaglia |
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| 2022-02-25 | 10-K | 10.15 | Executive Employment Agreement, dated December 14, 2021, between the Company and Jodi Delahunt Hubbell |
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| 2022-02-25 | 10-K | 10.14 | Executive Employment Agreement, dated December 14, 2021, between the Company and Kirk D. Jensen |
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| 2022-02-25 | 10-K | 10.13 | Executive Employment Agreement, dated December 14, 2021, between the Company and Marcy D. Mutch |
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| 2022-02-25 | 10-K | 10.11 | Company Director Compensation Summary |
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| 2021-11-04 | 10-Q | 10.10 | Amendment 2021-1 to the First Interstate BancSystem, Inc. Deferred Compensation Plan. |
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| 2021-11-04 | 10-Q | 10.7 | Employment Agreement between the Company, First Interstate Bank, and Phil Gaglia dated August 19, 2021 |
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| 2021-11-04 | 10-Q | 10.6 | Employment Agreement between the Company, First Interstate Bank, and Kirk Jensen dated August 19, 2021 |
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| 2021-11-04 | 10-Q | 10.5 | Employment Agreement between the Company, First Interstate Bank, and Kade Peterson dated August 19, 2021 |
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| 2021-09-20 | 8-K | 10.3 | Letter Agreement, dated as of September 15, 2021, between First Interstate BancSystem, Inc. and the shareholders listed therein. |
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| 2021-09-20 | 8-K | 10.2 | Stockholders’ Agreement, dated as of September 15, 2021, by and between the individuals and entities listed therein and First Interstate BancSystem, Inc. |
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| 2021-09-20 | 8-K | 10.1 | Support Agreement, dated as of September 15, 2021, by and among each of the shareholders of First Interstate BancSystem, Inc. listed therein. |
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| 2021-08-20 | 8-K | 10.4 | EX-10.4 RLEE EMP AGMT |
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| 2021-08-20 | 8-K | 10.3 | EX-10.3 JDELAHUNTHUBBELL EMP AGMT |
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| 2021-08-20 | 8-K | 10.2 | EX-10.2 MMUTCH EMP AGMT |
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| 2021-08-20 | 8-K | 10.1 | EX-10.1 KRILEY EMP AGMT |
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| 2021-05-07 | 10-Q | 10.3 | First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan Performance Time Vested Restricted Stock Grant Agreement. |
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| 2021-05-07 | 10-Q | 10.2 | First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan Performance Restricted Stock Grant Agreement. |
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| 2021-05-07 | 10-Q | 10.1 | First Amendment to the First Interstate BancSystem, Inc. Deferred Compensation Plan. |
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| 2021-03-01 | 10-K | 10.11 | EX-10.11 - DIRECTOR COMPENSATION |
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| 2020-02-27 | 10-K | 10.11 | First Interstate BancSystem, Inc. Director Compensation |
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| 2020-02-27 | 10-K | 10.9 | First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan Performance Restricted Stock Grant Agreement |
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| 2019-02-27 | 10-K | 10.16 | PGAGLIA EMPLOYMENT AGREEMENT |
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| 2019-02-27 | 10-K | 10.15 | JDELAHUNTHUBBELL EMPLOYMENT AGREEMENT |
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| 2019-02-27 | 10-K | 10.14 | RNEWMAN EMPLOYMENT AGREEMENT |
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| 2019-02-27 | 10-K | 10.11 | DIRECTOR COMPENSATION |
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| 2019-02-27 | 10-K | 10.10 | FORM OF 2015 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK AWARD AGREEMENT (TIME) |
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| 2019-02-27 | 10-K | 10.9 | FORM OF 2015 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK AGREEMENT (PERFORMANCE) |
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| 2019-02-27 | 10-K | 10.8 | 2015 EQUITY AND INCENTIVE PLAN AMENDMENT 1 |
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| 2018-04-05 | 8-K | 10.2 | Employment Agreement by and between Marcy D. Mutch, First Interstate BancSystem, Inc. and First Interstate Bank, effective April 3, 2018. |
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| 2018-04-05 | 8-K | 10.1 | Employment Agreement by and between Kevin P. Riley, First Interstate BancSystem, Inc. and First Interstate Bank, effective April 3, 2018. |
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| 2018-02-28 | 10-K | 10.10 | DIRECTOR COMPENSATION |
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| 2018-02-28 | 10-K | 10.9 | FORM OF 2015 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK AWARD AGREEMENT (TIME) |
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| 2018-02-28 | 10-K | 10.8 | FORM OF 2015 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK AGREEMENT (PERFORMANCE) |
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| 2018-02-28 | 10-K | 10.7 | 2015 EQUITY AND INCENTIVE PLAN |
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| 2018-02-28 | 10-K | 10.1 | 401 JV LEASE AGREEMENT AND ADDENDUMS |
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| 2016-05-06 | 10-Q | 10.3 | DEFERRED COMPENSATION PLAN |
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| 2015-11-09 | 10-Q | 10.12 | EMPLOYMENT AGREEMENT |
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| 2014-02-28 | 10-K | 10.9 | FORM OF PERFORMANCE ROE EQUITY COMPENSATION AWARDS |
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| 2014-02-28 | 10-K | 10.8 | FORM OF PERFORMANCE ROA EQUITY COMPENSATION AWARDS |
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| 2013-07-31 | 10-Q | 10.11 | 4TH AMENDMENT TO 2006 EQUITY COMPENSATION PLAN |
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| 2013-05-01 | 10-Q | 10.10 | 3RD AMENDMENT TO 2006 EQUITY COMPENSATION PLAN |
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| 2013-02-13 | 8-K | 10.1 | FORM OF FIRST INTERSTATE BANCSYSTEM, INC. |
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| 2010-11-04 | 10-Q | 10.9 | Second Amendment to the First Interstate BancSystem, Inc. 2006 Equity Compensation Plan |
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| 2010-11-04 | 10-Q | 10.6 | Second Amendment to 2001 Stock Option Plan |
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| 2010-03-22 | 8-K | 10.1 | Amendment to the First Interstate BancSystem, Inc. 2006 Equity Compensation Plan, dated March 19, 2010. |
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| 2010-01-07 | 8-K | 10.2 | THIRD AMENDMENT TO |
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| 2009-11-25 | 8-K | 10.19 | Second Amendment to Credit Agreement dated as of November 19, 2009, among First Interstate BancSystem, Inc., as Borrower; the Various Lenders identified therein; and Wells Fargo Bank, National Association, as Administrative Agent. |
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| 2009-05-11 | 10-Q | 10.15 | First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Performance) for Lyle R. Knight |
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| 2009-03-23 | 10-K | 10.17 | Relocation Services Agreement between First Interstate BancSystem, Inc. and NRI Relocation, Inc. dated April 25, 2008 for the benefit of Julie Castle, and related Memorandum Agreement between First Interstate BancSystem, Inc. and Julie Castle dated May 23, 2008 |
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| 2009-03-23 | 10-K | 10.16 | First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement for Lyle R. Knight |
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| 2009-03-23 | 10-K | 10.15 | First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Performance) for Lyle R. Knight |
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| 2009-03-23 | 10-K | 10.14 | Form of First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Performance) for Certain Executive Officers |
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| 2009-03-23 | 10-K | 10.13 | Form of First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Time) for Certain Executive Officers |
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