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1st Advantage Bank is a locally owned, full service community bank located in St. Peters, Missouri and has been servicing the metropolitan St. Louis area since 2005. While you might feel like you're just a number to the big bank around the corner, with us, you'll feel like a neighbor. The reason is simple: as a community bank, every customer is important to us. You are the bedrock of our future success. 1st Advantage Bank is Your “Big Bank” Alternative!