{"filing":{"accession_number":"0001140361-26-037240","cik":"0000790359","ticker":"NBTB","company_name":"NBT BANCORP INC","form":"8-K","filing_date":"2026-09-21","report_date":"2026-09-21","primary_document":"ef20082455_8k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/790359/000114036126037240/ef20082455_8k.htm"},"events":[{"id":33993,"run_id":31294,"accession_number":"0001140361-26-037240","anchor_item_number":"5.02","event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"The filing discloses the appointment of Kimberly A. Boynton to the Board of Directors of NBT Bancorp Inc., effective October 1, 2026, following the Board's decision to increase its size to thirteen directors. The disclosure focuses on her appointment to fill a newly created vacancy and her qualifications, including her background as former President and CEO of Crouse Health and extensive board governance experience. This is a material governance event affecting the composition of the registrant's board of directors.","company_name":"NBT BANCORP INC","ticker":"NBTB","filing_date":"2026-09-21","form":"8-K","submitted_at":null,"items":[{"id":37602,"accession_number":"0001140361-26-037240","item_number":"5.02","item_title":null,"event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"The filing discloses the appointment of Kimberly A. Boynton to the Board of Directors of NBT Bancorp Inc., effective October 1, 2026, following the Board's decision to increase its size to thirteen directors. The disclosure focuses on her appointment to fill a newly created vacancy and her qualifications, including her background as former President and CEO of Crouse Health and extensive board governance experience. This is a material governance event affecting the composition of the registrant's board of directors.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-09-21T20:18:12.138480+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":37602,"accession_number":"0001140361-26-037240","item_number":"5.02","item_title":null,"event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"The filing discloses the appointment of Kimberly A. Boynton to the Board of Directors of NBT Bancorp Inc., effective October 1, 2026, following the Board's decision to increase its size to thirteen directors. The disclosure focuses on her appointment to fill a newly created vacancy and her qualifications, including her background as former President and CEO of Crouse Health and extensive board governance experience. This is a material governance event affecting the composition of the registrant's board of directors.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-09-21T20:18:12.138480+00:00","company_name":"NBT BANCORP INC","ticker":"NBTB","filing_date":"2026-09-21"}]}