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Customer Care Center

Available 7 AM - 7 PM (MT) Monday-Friday and 7 AM - 3 PM (MT) Saturday
Call: 888.827.5564
Email us

CheckIt – Automated Phone Banking

Call: 800.552.2432

Credit Card & Debit Card Travel Notification

Traveling out of state or overseas? Purchases not typical with your spending patterns may trigger fraud alerts for your protection. Call us in advance of any atypical travel or unusual purchase plans.

Call: 888.827.5564

Report a Lost or Stolen Debit Card

Call: 800.472.3272

Mortgage Servicing

Request for Information or Notice of Errors must be sent to:
Guardian Mortgage, a division of Sunflower Bank, N.A.
Customer Service
P.O. Box 833890
Richardson, TX 75083-3890

(800) 331.4799

Provide Feedback

Whether a compliment, complaint or suggestion – we’d love to hear from you. Please take a moment to help us enhance our service levels, elevate our product offerings or give us a pat on the back if you love your bank.
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Website Accessibility

At First National 1870, we are committed to providing a website that is accessible to all of our site visitors. If you have any difficulty accessing any of the information on, or have any suggestions for accessibility improvements we could make, please call 888.827.5564 or email

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