{"filing":{"accession_number":"0000842517-26-000138","cik":"0000842517","ticker":"ISBA","company_name":"ISABELLA BANK CORP","form":"8-K","filing_date":"2026-06-12","report_date":null,"primary_document":"isba-20260612.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/842517/000084251726000138/isba-20260612.htm"},"events":[{"id":5186,"run_id":4541,"accession_number":"0000842517-26-000138","anchor_item_number":"7.01","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"summary":"Isabella Bank Corporation entered into an Agreement and Plan of Merger with Grand River Commerce, Inc. on June 11, 2026, with a joint press release issued on June 12, 2026. This constitutes entry into a material acquisition/merger transaction, which is a core M\u0026A activity event requiring disclosure under Item 1.01 or related provisions. The disclosure of the executed Merger Agreement and supplemental investor presentation clearly signals a material change of control or acquisition event.","company_name":"ISABELLA BANK CORP","ticker":"ISBA","filing_date":"2026-06-12","form":"8-K","submitted_at":null,"items":[{"id":6499,"accession_number":"0000842517-26-000138","item_number":"7.01","item_title":"Regulation FD Disclosure","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"Isabella Bank Corporation entered into an Agreement and Plan of Merger with Grand River Commerce, Inc. on June 11, 2026, with a joint press release issued on June 12, 2026. This constitutes entry into a material acquisition/merger transaction, which is a core M\u0026A activity event requiring disclosure under Item 1.01 or related provisions. The disclosure of the executed Merger Agreement and supplemental investor presentation clearly signals a material change of control or acquisition event.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-12T13:18:07.014317+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":6499,"accession_number":"0000842517-26-000138","item_number":"7.01","item_title":"Regulation FD Disclosure","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"Isabella Bank Corporation entered into an Agreement and Plan of Merger with Grand River Commerce, Inc. on June 11, 2026, with a joint press release issued on June 12, 2026. This constitutes entry into a material acquisition/merger transaction, which is a core M\u0026A activity event requiring disclosure under Item 1.01 or related provisions. The disclosure of the executed Merger Agreement and supplemental investor presentation clearly signals a material change of control or acquisition event.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-12T13:18:07.014317+00:00","company_name":"ISABELLA BANK CORP","ticker":"ISBA","filing_date":"2026-06-12"}]}