{"filing":{"accession_number":"0000357173-26-000042","cik":"0000357173","ticker":"OSBC","company_name":"OLD SECOND BANCORP INC","form":"8-K","filing_date":"2026-07-22","report_date":null,"primary_document":"osbc-20260722x8k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/357173/000035717326000042/osbc-20260722x8k.htm"},"events":[{"id":19469,"run_id":17525,"accession_number":"0000357173-26-000042","anchor_item_number":"2.02","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.98,"summary":"Old Second Bancorp issued a press release on July 22, 2026 announcing its second quarter 2026 financial results, including net income of $28.2 million ($0.54 per diluted share), net interest margin of 5.23%, and other key financial metrics. The disclosure is a standard quarterly earnings announcement with detailed results of operations, credit quality metrics, and capital information, attached as Exhibit 99.1 to the 8-K Item 2.02 filing.","company_name":"OLD SECOND BANCORP INC","ticker":"OSBC","filing_date":"2026-07-22","form":"8-K","submitted_at":null,"items":[{"id":18565,"accession_number":"0000357173-26-000042","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":"Old Second Bancorp issued a press release on July 22, 2026 announcing its second quarter 2026 financial results, including net income of $28.2 million ($0.54 per diluted share), net interest margin of 5.23%, and other key financial metrics. The disclosure is a standard quarterly earnings announcement with detailed results of operations, credit quality metrics, and capital information, attached as Exhibit 99.1 to the 8-K Item 2.02 filing.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-22T20:06:54.670330+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":18565,"accession_number":"0000357173-26-000042","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":"Old Second Bancorp issued a press release on July 22, 2026 announcing its second quarter 2026 financial results, including net income of $28.2 million ($0.54 per diluted share), net interest margin of 5.23%, and other key financial metrics. The disclosure is a standard quarterly earnings announcement with detailed results of operations, credit quality metrics, and capital information, attached as Exhibit 99.1 to the 8-K Item 2.02 filing.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-22T20:06:54.670330+00:00","company_name":"OLD SECOND BANCORP INC","ticker":"OSBC","filing_date":"2026-07-22"}]}