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General Banking Assistance:
877-747-3139 • 8:00am - 4:30pm MST
24-Hour ExpressLine Phone Banking:
Online/Mobile Banking Assistance:
844-277-8860 • 6:30am - 5:00pm MST
Report Lost or Stolen Debit Card: 877-747-3139
Fraud Alert Verification: 855-961-1602
*Please specify Security First Bank - South Dakota when reporting
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Click the chat icon in the lower right corner of this page to start a chat. Chat Availability: 8:00am – 5:00pm MST.