When David Wegner went looking for a checking account in January, he was peppered with offers for low-end financial products, including a prepaid debit card with numerous fees, a short-term emergency loan with steep charges, money wire services and check-cashing options.

“I may as well have gone to a payday lender,” said Mr. Wegner, a 36-year-old nursing assistant in Minneapolis, who ended up choosing a local branch of U.S. Bank and avoided the payday lenders, pawnshops and check cashers lining his neighborhood.

Along with a checking account, he selected a $1,000 short-term loan to help pay for his cystic fibrosis medications. The loan cost him $100 in fees, and that will escalate if it goes unpaid.

An increasing number of the nation’s large banks — U.S. Bank, Regions Financial and Wells Fargo among them — are aggressively courting low-income customers like Mr. Wegner with alternative products that can carry high fees. They are rapidly expanding these offerings partly because the products were largely untouched by recent financial regulations, and also to recoup the billions in lost income from recent limits on debit and credit card fees.