Pontiac Bancorp, Inc., the holding company of Bank of Pontiac, has agreed to acquire Ottawa Bancorp, Inc., the holding company of OSB Community Bank, for cash consideration of $45.5 million, or approximately $19.78 per share, subject to adjustments under the merger agreement. The transaction is expected to close in the first quarter of 2027, pending Ottawa Bancorp shareholder approval, regulatory approvals and other customary closing conditions. OSB would be merged into Bank of Pontiac, with the surviving bank operating under the Bank of Pontiac name. Based on June 30, 2026 financial information, the combined institution is expected to have approximately $1.5 billion in assets and 18 banking offices, including OSB's three full-service locations and one loan production office in LaSalle and Grundy Counties.