Bonus offer is valid between October 5, 2026 – December 31, 2026. Offer is subject to change or termination at any time without notice. Minimum opening deposit of $25-$100 required, dependent on account type.

¹Consumer Checking Account Bonus Offer: Earn a $400 bonus or gift when you open a new consumer checking account, and complete all required account activities within 90 calendar days of account opening (“qualifying period”):

• Open a new eligible consumer checking account, subject to approval;
• Make at least one qualifying debit card transaction; and
• Receive a qualifying direct deposit.

To receive the bonus or gift, the account must be open for at least 90 calendar days and have a balance greater than zero at the end of the qualifying period. Bonus or gift will be provided within 30 days after the end of the 90-day qualifying period, if requirements are met.

Qualifying Transactions: Debit card purchases must be point-of-sale transactions (ATM transactions do not qualify). Direct deposits must be qualifying electronic deposits; person-to-person transfers may not qualify. See full account terms for additional details.

Bonus or Gift Options: Eligible client may choose one (1) of the following bonus options when they open their new checking account: Dyson Supersonic® hair dryer Prussian Blue/Rich Copper (retail value $399.99), Vitamix® VX1 Blender (retail value $379.95), or a Blackstone® E-Series 22" Electric Griddle (retail value $349.95), or a $400 credit to the new account. Gift selections are available only for accounts opened in person. Accounts opened online will automatically default to the $400 credit.

Additional Terms: Offer available only to new consumer checking account clients. New client must be primary owner on the account. Not available to current consumer checking clients, anyone who has had a consumer checking account with CSB within the past 12 months, or anyone who has previously received a consumer checking account bonus from CSB. If under age 18, a parent or legal guardian is required as a joint owner. Offer cannot be combined with other offers. Offer is available only to Iowa residents.

Consumer Checking Annual Percentage Yield (APY) will range from 0.00% - 4.00% depending on the account type that is opened. APY range is accurate as of September 1, 2026. Plus Checking and Select Checking require a minimum balance of $500 to earn interest. Additional account requirements will apply to the Edge Checking account to obtain the premium APY. Rate may change after the account is opened. Monthly service charges may apply to some consumer checking products. Fees could reduce earnings. Visit www.bankcsb.com for more information on our consumer checking products.

²Refer-a-Friend offer details Refer a new client to open a checking account, subject to approval. Once the new client has met all requirements of the new checking account bonus offer and its qualifying terms, the current client will receive a $50 credit into their CSB checking account within 30 calendar days after the end of the 90-day bonus offer qualifying period, provided both the current client and referred accounts remain open at the time of payout. Bonus will be applied as a credit to the referring client’s account. New clients may not combine this with any other promotion. Existing clients can earn unlimited Refer-A-Friend bonuses. Promotion ends December 31, 2026 and is subject to change without notice.

Dyson Supersonic® is a registered trademark of Dyson Technology Limited. Vitamix® is a registered trademark of Vita‑Mix Management Corporation. Blackstone® is a registered trademark of Blackstone Products, Inc. These companies are not affiliated with or sponsoring this promotion.