[4] FirstBank was founded by George and Everett Williams in Lakewood, Colorado, in 1963 as the First Westland National Bank.

[5][14] In 1985, the bank opened its first location outside Colorado in Palm Desert, California.

In June 2016, the organization completed an addition to its facilities that expanded it to a 227,000-square-foot campus that could accommodate up to 1,400 employees.

[17] In February 2020, FirstBank opened its Multicultural Banking Center in Lakewood to provide banking services in languages such as Spanish, Chinese, Mandarin Chinese, Korean, Vietnamese and Cantonese.

FirstBank received the 2016 Corporate Citizenship award from Governor John Hickenlooper.