{"filing":{"accession_number":"0000860413-26-000075","cik":"0000860413","ticker":"FIBK","company_name":"FIRST INTERSTATE BANCSYSTEM INC","form":"8-K","filing_date":"2026-07-09","report_date":null,"primary_document":"fibk-20260709.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/860413/000086041326000075/fibk-20260709.htm"},"events":[{"id":16817,"run_id":15044,"accession_number":"0000860413-26-000075","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"Kirk D. Jensen, Executive Vice President and General Counsel/Corporate Secretary, was terminated involuntarily and without cause effective July 9, 2026. This is a departure of a named executive officer from a senior legal and governance role. The filing explicitly states the termination was involuntary and references the employment agreement, confirming this is a material executive departure requiring disclosure under Item 5.02.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-07-09","form":"8-K","submitted_at":null,"items":[{"id":15026,"accession_number":"0000860413-26-000075","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":"Kirk D. Jensen, Executive Vice President and General Counsel/Corporate Secretary, was terminated involuntarily and without cause effective July 9, 2026. This is a departure of a named executive officer from a senior legal and governance role. The filing explicitly states the termination was involuntary and references the employment agreement, confirming this is a material executive departure requiring disclosure under Item 5.02.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-10T10:34:42.866698+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":15026,"accession_number":"0000860413-26-000075","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":"Kirk D. Jensen, Executive Vice President and General Counsel/Corporate Secretary, was terminated involuntarily and without cause effective July 9, 2026. This is a departure of a named executive officer from a senior legal and governance role. The filing explicitly states the termination was involuntary and references the employment agreement, confirming this is a material executive departure requiring disclosure under Item 5.02.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-10T10:34:42.866698+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-07-09"}]}