If a customer needs to report a lost or stolen debit card associated with 1st Source Bank, they should act promptly to safeguard their account. It is generally recommended to visit 1st Source Bank's official website, where they provide specific guidelines on reporting lost or stolen cards. This typically includes instructions for blocking the card to prevent unauthorized transactions and how to request a replacement card. Customers can often find a dedicated customer service number listed on the website, which can be helpful for immediate assistance. It is essential to report the loss as soon as possible to minimize potential financial impact and ensure account security. Additionally, 1st Source Bank may offer tips on what to do next, such as monitoring account activity and changing online banking passwords.