Online Banking

SFCU System Update January 19, 2026

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Sentinel Federal Credit Union will be undergoing a system update on Monday, January 19, 2026. During this time, there will be intermittent unavailability for self-services such as:

  • Online and audio banking for most of Monday, January 19, 2026
  • Debit cards will have limited availability for use for all of Monday, January 19, 2026
  • Shared Branching will be unavailable for the entire day of Monday, January 19, 2026

We anticipate the system update to be complete by Tuesday, January 20, 2026. If you experience any interruptions as of Tuesday, January 20, please reach out to us at 888-923-1400 or at service@sentinelfcu.org.

We thank you for your patience during this system update, and for your continued membership!

Please note: January 19th is Martin Luther King Jr. Day a federal holiday. All SFCU branches will be closed.

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What Our Members Say About Us

Joe M

Member

“We have several credit unions that got lost in the mix during a move–our bad. However, out of all of those credit unions, SFCU went OUT OF THEIR WAY to ensure we knew our account was dormant and helped us through the process of getting the account back on track. They also refunded every fee taken for dormant status. After losing more money than I’d like to admit from other institutions, I cannot tell you how much I appreciate the customer service of Sentinel FCU.”

Chris P

Member

“If you’re in the Rapid City area and you’re looking to drop the elbow off the top rope, Macho Man style, then look to Sentinel Federal Credit Union! Their customer service is off the hook and when you call you never get a robot or an automated answering machine! I don’t think I’ll trust another big bank with my money for as long as I live! By the way, I don’t even live in South Dakota!”

Joshua K.

Member

“Been a loyal member for years! Keep your account positive and make your payments. If life happens keep them updated, as they have ways of working with you. I am glad they are a part of my financial family.”

Bret R

Member

“I have been using Sentinel for almost 30 years, and my family has been just as long! I purposely make the extra drive to the Radar Hill Branch with Nate working there! Not only has he always been on the ball of my personal account, but my business account! He has resolved issues with other banks in a timely manner when he didn’t have to! Every time I go on he always has a smiling face and is easy to work with.”