{"filing":{"accession_number":"0000860413-26-000097","cik":"0000860413","ticker":"FIBK","company_name":"FIRST INTERSTATE BANCSYSTEM INC","form":"8-K","filing_date":"2026-10-22","report_date":"2026-10-22","primary_document":"fibk-20261022.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/860413/000086041326000097/fibk-20261022.htm"},"events":[{"id":37229,"run_id":34321,"accession_number":"0000860413-26-000097","anchor_item_number":"2.02","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.97,"summary":"First Interstate BancSystem issued a press release on October 22, 2026 disclosing third-quarter 2026 financial results, including net income of $62.2 million ($0.65 per diluted share) and net interest margin of 3.53%.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-10-22","form":"8-K","submitted_at":null,"items":[{"id":41876,"accession_number":"0000860413-26-000097","item_number":"2.02","item_title":"Results of Operations and Financial Condition.","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.98,"reasoning":"First Interstate BancSystem issued a press release on October 22, 2026 disclosing third-quarter 2026 financial results, including net income of $62.2 million ($0.65 per diluted share), net interest margin of 3.53%, and key balance sheet metrics. This is a standard quarterly earnings release furnished as Exhibit 99.1 under Item 2.02, which is the designated Item for disclosure of results of operations and financial condition.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-22T20:13:16.132908+00:00","company_name":"","ticker":null,"filing_date":""},{"id":41877,"accession_number":"0000860413-26-000097","item_number":"7.01","item_title":"Regulation FD Disclosure.","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.95,"reasoning":"The Item 7.01 disclosure references a corporate presentation posted on October 22, 2026, but the substantive content furnished as Exhibit 99.1 is a press release reporting third quarter 2026 financial results for First Interstate BancSystem, Inc., including net income of $62.2 million ($0.65 per diluted share), net interest margin of 3.53%, and other key financial metrics. This is a standard quarterly earnings release material to investors assessing the registrant's financial performance.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-22T20:13:16.132908+00:00","company_name":"","ticker":null,"filing_date":""}]},{"id":37230,"run_id":34321,"accession_number":"0000860413-26-000097","anchor_item_number":"8.01","event_type":"dividend_distribution","event_domain":"financial","is_material":true,"confidence":0.95,"summary":"The Board of Directors declared a dividend of $0.47 per share, payable November 13, 2026, to shareholders of record as of November 3, 2026.","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-10-22","form":"8-K","submitted_at":null,"items":[{"id":41878,"accession_number":"0000860413-26-000097","item_number":"8.01","item_title":"Other Events.","event_type":"dividend_distribution","event_domain":"financial","is_material":true,"confidence":0.95,"reasoning":"The Item 8.01 disclosure explicitly announces that the Board of Directors declared a dividend of $0.47 per share, payable November 13, 2026, to shareholders of record as of November 3, 2026. This is a routine but material capital allocation decision that affects shareholder returns and is customary for a bank of this size to disclose in an 8-K.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-22T20:13:16.132908+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":41876,"accession_number":"0000860413-26-000097","item_number":"2.02","item_title":"Results of Operations and Financial Condition.","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.98,"reasoning":"First Interstate BancSystem issued a press release on October 22, 2026 disclosing third-quarter 2026 financial results, including net income of $62.2 million ($0.65 per diluted share), net interest margin of 3.53%, and key balance sheet metrics. This is a standard quarterly earnings release furnished as Exhibit 99.1 under Item 2.02, which is the designated Item for disclosure of results of operations and financial condition.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-22T20:13:16.132908+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-10-22"},{"id":41877,"accession_number":"0000860413-26-000097","item_number":"7.01","item_title":"Regulation FD Disclosure.","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.95,"reasoning":"The Item 7.01 disclosure references a corporate presentation posted on October 22, 2026, but the substantive content furnished as Exhibit 99.1 is a press release reporting third quarter 2026 financial results for First Interstate BancSystem, Inc., including net income of $62.2 million ($0.65 per diluted share), net interest margin of 3.53%, and other key financial metrics. This is a standard quarterly earnings release material to investors assessing the registrant's financial performance.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-22T20:13:16.132908+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-10-22"},{"id":41878,"accession_number":"0000860413-26-000097","item_number":"8.01","item_title":"Other Events.","event_type":"dividend_distribution","event_domain":"financial","is_material":true,"confidence":0.95,"reasoning":"The Item 8.01 disclosure explicitly announces that the Board of Directors declared a dividend of $0.47 per share, payable November 13, 2026, to shareholders of record as of November 3, 2026. This is a routine but material capital allocation decision that affects shareholder returns and is customary for a bank of this size to disclose in an 8-K.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-22T20:13:16.132908+00:00","company_name":"FIRST INTERSTATE BANCSYSTEM INC","ticker":"FIBK","filing_date":"2026-10-22"}]}