U.S. Bank is expanding its “PowerBank” customer service program to Colorado.

The initiatives was launched last year in St. Louis and Portland, Ore.

The Minneapolis-based bank said it had hired about 100 new Colorado employees as part of the initiative, and is expected to hire about 150 more by the end of the year, mostly in the Denver area. The new employees will be primarily tellers and small business specialists based in branch offices.

In addition to adding staff, U.S. Bank will extend branch hours, refurbish branch offices and increase advertising. There also will be a team dedicated to identifying and resolving service issues.

U.S. Bank, which for years held the second-biggest market share in Denver – behind Wells Fargo – dropped to third place in 2007, edged out by Lakewood-based FirstBank.