{"filing":{"accession_number":"0000357173-26-000028","cik":"0000357173","ticker":"OSBC","company_name":"OLD SECOND BANCORP INC","form":"8-K","filing_date":"2026-06-09","report_date":null,"primary_document":"osbc-20260605x8k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/357173/000035717326000028/osbc-20260605x8k.htm"},"events":[{"id":4324,"run_id":3777,"accession_number":"0000357173-26-000028","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"Dennis Klaeser, a Board member and member of multiple committees (Executive, Audit, Compensation, Risk, and Capital), resigned effective immediately on June 5, 2026. The disclosure centers on his departure from the Board and Bank Board after 5 years of service. While the company states the resignation is not due to disagreement, the loss of a director with significant committee responsibilities is material to investors assessing board composition and governance.","company_name":"OLD SECOND BANCORP INC","ticker":"OSBC","filing_date":"2026-06-09","items":[{"id":5446,"accession_number":"0000357173-26-000028","item_number":"5.02","item_title":null,"event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"Dennis Klaeser, a Board member and member of multiple committees (Executive, Audit, Compensation, Risk, and Capital), resigned effective immediately on June 5, 2026. The disclosure centers on his departure from the Board and Bank Board after 5 years of service. While the company states the resignation is not due to disagreement, the loss of a director with significant committee responsibilities is material to investors assessing board composition and governance.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T15:01:06.137374+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":5446,"accession_number":"0000357173-26-000028","item_number":"5.02","item_title":null,"event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"Dennis Klaeser, a Board member and member of multiple committees (Executive, Audit, Compensation, Risk, and Capital), resigned effective immediately on June 5, 2026. The disclosure centers on his departure from the Board and Bank Board after 5 years of service. While the company states the resignation is not due to disagreement, the loss of a director with significant committee responsibilities is material to investors assessing board composition and governance.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T15:01:06.137374+00:00","company_name":"OLD SECOND BANCORP INC","ticker":"OSBC","filing_date":"2026-06-09"}]}