{"filing":{"accession_number":"0000860413-26-000078","cik":"0000860413","ticker":"FIBK","company_name":"FIRST INTERSTATE BANCSYSTEM INC","form":"8-K","filing_date":"2026-07-16","report_date":null,"primary_document":"fibk-20260713.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/860413/000086041326000078/fibk-20260713.htm"},"events":[{"id":18404,"run_id":16543,"accession_number":"0000860413-26-000078","anchor_item_number":"5.02","event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"The disclosure centers on the Board's appointment of two new Class II directors, Matthew Ritter and Kevin Turner, on July 13, 2026, to fill vacancies created by a board size increase. Both appointees have substantial executive and board experience (Turner was former COO of Microsoft; Ritter has 25+ years in finance and real estate), and their appointments are material to investors as they expand board composition and governance. The related-party transaction disclosure and committee assignments are ancillary to the principal event of their appointment.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-07-16","form":"8-K","submitted_at":null,"items":[{"id":17205,"accession_number":"0000860413-26-000078","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_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"The disclosure centers on the Board's appointment of two new Class II directors, Matthew Ritter and Kevin Turner, on July 13, 2026, to fill vacancies created by a board size increase. Both appointees have substantial executive and board experience (Turner was former COO of Microsoft; Ritter has 25+ years in finance and real estate), and their appointments are material to investors as they expand board composition and governance. The related-party transaction disclosure and committee assignments are ancillary to the principal event of their appointment.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-16T20:08:58.108645+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":17205,"accession_number":"0000860413-26-000078","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_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"The disclosure centers on the Board's appointment of two new Class II directors, Matthew Ritter and Kevin Turner, on July 13, 2026, to fill vacancies created by a board size increase. Both appointees have substantial executive and board experience (Turner was former COO of Microsoft; Ritter has 25+ years in finance and real estate), and their appointments are material to investors as they expand board composition and governance. The related-party transaction disclosure and committee assignments are ancillary to the principal event of their appointment.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-16T20:08:58.108645+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-07-16"}]}