{"filing":{"accession_number":"0000860413-26-000048","cik":"0000860413","ticker":"FIBK","company_name":"FIRST INTERSTATE BANCSYSTEM INC","form":"8-K","filing_date":"2026-05-29","report_date":null,"primary_document":"fibk-20260527.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/860413/000086041326000048/fibk-20260527.htm"},"events":[{"id":2019,"run_id":1756,"accession_number":"0000860413-26-000048","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"Three directors—Patricia L. Moss, David L. Jahnke, and Stephen M. Lacy—retired and resigned from the Board effective immediately prior to the 2026 Annual Meeting upon reaching the mandatory retirement age of 72, reducing the Board from 14 to 11 directors.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-05-29","items":[{"id":2567,"accession_number":"0000860413-26-000048","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"Three directors—Patricia L. Moss, David L. Jahnke, and Stephen M. Lacy—retired and resigned from the Board effective immediately prior to the 2026 Annual Meeting upon reaching the mandatory retirement age of 72 under the Company's director retirement policy. The retirement of three board members, representing a reduction from 14 to 11 directors, is a material change in the composition of the Board and would affect a reasonable investor's assessment of the Company's governance structure.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-30T02:04:40.096186+00:00","company_name":"","ticker":null,"filing_date":""}]},{"id":2020,"run_id":1756,"accession_number":"0000860413-26-000048","anchor_item_number":"5.07","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"summary":"The 2026 Annual Meeting held on May 27, 2026 approved four proposals: election of Class II directors (Alice S. Cho, Dennis L. Johnson, and Daniel A. Rykhus), approval of a Charter Amendment, advisory approval of named executive officer compensation, and ratification of Ernst \u0026 Young LLP as independent auditor.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-05-29","items":[{"id":2569,"accession_number":"0000860413-26-000048","item_number":"5.07","item_title":"Submission of Matters to a Vote of Security Holders.","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"reasoning":"This Item 5.07 disclosure presents the final voting results from the 2026 Annual Meeting held on May 27, 2026, covering four proposals: election of Class II directors (Alice S. Cho, Dennis L. Johnson, and Daniel A. Rykhus), approval of a Charter Amendment, advisory approval of named executive officer compensation, and ratification of Ernst \u0026 Young LLP as independent auditor. The tabular presentation of vote counts (For, Against, Abstentions, Broker Non-Votes) for each proposal is the defining characteristic of shareholder vote results disclosure.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-30T02:04:40.096186+00:00","company_name":"","ticker":null,"filing_date":""}]},{"id":2021,"run_id":1756,"accession_number":"0000860413-26-000048","anchor_item_number":"5.03","event_type":"other_material","event_domain":"catchall","is_material":false,"confidence":0.85,"summary":"The Company amended its Certificate of Incorporation and Bylaws regarding voting standards for director elections, establishing plurality voting in contested elections and majority voting in uncontested elections.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-05-29","items":[{"id":2568,"accession_number":"0000860413-26-000048","item_number":"5.03","item_title":"Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.","event_type":"other_material","event_domain":"catchall","is_material":false,"confidence":0.85,"reasoning":"This disclosure describes a routine amendment to the Company's Certificate of Incorporation and Bylaws regarding voting standards for director elections (plurality voting in contested elections, majority voting in uncontested elections). While technically a governance change, this is a standard administrative matter approved by shareholders and does not affect the registrant's financial condition, operations, or investor risk profile in a material way.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-30T02:04:40.096186+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":2567,"accession_number":"0000860413-26-000048","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"Three directors—Patricia L. Moss, David L. Jahnke, and Stephen M. Lacy—retired and resigned from the Board effective immediately prior to the 2026 Annual Meeting upon reaching the mandatory retirement age of 72 under the Company's director retirement policy. The retirement of three board members, representing a reduction from 14 to 11 directors, is a material change in the composition of the Board and would affect a reasonable investor's assessment of the Company's governance structure.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-30T02:04:40.096186+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-05-29"},{"id":2568,"accession_number":"0000860413-26-000048","item_number":"5.03","item_title":"Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.","event_type":"other_material","event_domain":"catchall","is_material":false,"confidence":0.85,"reasoning":"This disclosure describes a routine amendment to the Company's Certificate of Incorporation and Bylaws regarding voting standards for director elections (plurality voting in contested elections, majority voting in uncontested elections). While technically a governance change, this is a standard administrative matter approved by shareholders and does not affect the registrant's financial condition, operations, or investor risk profile in a material way.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-30T02:04:40.096186+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-05-29"},{"id":2569,"accession_number":"0000860413-26-000048","item_number":"5.07","item_title":"Submission of Matters to a Vote of Security Holders.","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"reasoning":"This Item 5.07 disclosure presents the final voting results from the 2026 Annual Meeting held on May 27, 2026, covering four proposals: election of Class II directors (Alice S. Cho, Dennis L. Johnson, and Daniel A. Rykhus), approval of a Charter Amendment, advisory approval of named executive officer compensation, and ratification of Ernst \u0026 Young LLP as independent auditor. The tabular presentation of vote counts (For, Against, Abstentions, Broker Non-Votes) for each proposal is the defining characteristic of shareholder vote results disclosure.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-30T02:04:40.096186+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-05-29"}]}