Congratulations Katie Williams - one of this year's winners for 20 Under 40 in the Flathead Valley, and always at the top of our list. First Interstate Bank Built for you. firstinterstate.com Member FDIC. Equal Housing Lender. Congratulations Katie Williams - one of this year's winners for 20 Under 40 in the Flathead Valley , and always at the top of our list . First Interstate Bank Built for you . firstinterstate.com Member FDIC . Equal Housing Lender .