A top Federal Reserve regulator on Tuesday cited Wells Fargo & Co's accounts scandal as evidence that incentives to drive performance remain a problem on Wall Street, saying that banks have "a long way to go" in reforming internal culture.

William Dudley, president of the Federal Reserve Bank of New York.

William Dudley, president of the New York Fed branch that acts as the U.S. central bank's eyes and ears on Wall Street, has complained about rotten bank culture for years. In a speech to bankers and regulators in London, he said the Wells case showed that "compensation, once again, seems to be at the center of a scandal."