Certificates of Deposit & Individual Retirement Accounts Montezuma State Bank continue to offer other savings options including Certificates of Deposit and IRAs. CDs and IRAs are a safe and secure way of growing your investment and retirement funds. Montezuma State Bank has a variety of terms and options available to coincide with your investment plans and savings needs. Contact a Montezuma State Bank representative at 641-623-5766 to obtain our current rates, deposit requirements, and account disclosures.