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Personal & Business Banking

CUSTOMER SERVICE CENTER

24 Hour INFO Line
  Access account info          (800) 235-4636

Banking Inquiries
  Toll Free                         (800) 235-4636  

BUSINESS HOURS
Monday - Saturday          8:00AM - 7:00PM CST

Email                                 Contact Us

Lost/Stolen ATM or Debit Card
  During business hours       (800) 235-4636
  After business hours          (800) 236-2442

Verification of Deposit Fax    (855) 332-0491

Report an error or
Unauthorized transaction      (844) 849-4078

MAILING ADDRESS

4000 West Brown Deer Road
Brown Deer, WI 53209

Bank Routing/Transit Numbers

The following routing numbers are to be used for establishing Direct Deposit and ACH payments only.

Wisconsin          275071288
Illinois              071974408
Minnesota          091071598

 

Frequently Asked Questions

If you can't find what you're looking for here or have any general questions, check out our Frequently Asked Questions page.

CLICK HERE FOR FAQ'S

Important News Regarding Email Communications

Because the security of your private information is important to us, BestBank has implemented a secure email policy for our outgoing emails.

If our response to your emailed question contains private information, such as balance or account number, you will receive a ZixMail Secure email message. This secure email message will contain a link to view the message containing our response to you. To access the message, follow the three easy steps below:

  1. Click on the link provided in the notification email
  2. Create a password
  3. Click “Submit”

To learn more about ZixMail, ZixMessage Center and other ZixCorp offerings, please click here.

Incoming emails (emails you send us) are not secure. To protect your information, please do not include confidential information such as account numbers, Social Security numbers or passwords when contacting us via email.

You are leaving Guaranty Bank

By clicking Continue, you will be taken to a website that is not affiliated with Guaranty Bank. Please be advised that you will no longer be subject to, or under the protection of, the privacy and security policies of Guaranty Bank's website. We encourage you to read and evaluate the privacy and security policies of the site you are entering, which may be different than those of Guaranty Bank.

Continue to External Site

Account Signup

Would you like to open a savings account as well?

If you would like to apply for both a Savings and Checking account please click on the Checking Account "Apply Now" button first and you will be presented with a option to add a Savings Account.

Cancel

You are leaving Guaranty Bank

By clicking Continue, you will be taken to a website that is not affiliated with Guaranty Bank. Please be advised that you will no longer be subject to, or under the protection of, the privacy and security policies of Guaranty Bank's website. We encourage you to read and evaluate the privacy and security policies of the site you are entering, which may be different than those of Guaranty Bank.