First Interstate Bank Custer Main Branch ← View details 648 Mount Rushmore Road, Custer, SD 57730 +1 605-673-2215 firstinterstatebank.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 09:00 am — 04:00 pm Tuesday: 09:00 am — 04:00 pm Wednesday: 09:00 am — 04:00 pm Thursday: 09:00 am — 04:00 pm Friday: 09:00 am — 04:00 pm Your comments * — Required information