First Security Bank & Trust Co. ← View details 308 Main Street, Thornton, IA 50479 +1 641-998-2312 1stsecuritybank.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 08:30 am — 03:00 pm Tuesday: 08:30 am — 03:00 pm Wednesday: 08:30 am — 03:00 pm Thursday: 08:30 am — 03:00 pm Friday: 08:30 am — 05:00 pm Saturday: 08:00 am — 11:00 am Your comments * — Required information