The share of mortgage lending to minority borrowers fell to at least a 14-year low as U.S. regulators struggle to ease credit to blacks and Hispanics shut out of the housing recovery.

These borrowers, whose share of the purchase mortgage market has been shrinking since the collapse of subprime lending, continued to lose ground to white borrowers through 2013, according to federal data released this week. Blacks and Hispanics were a smaller portion of borrowers last year than they were in 2000, before the housing bubble.