A heightened emphasis by banking regulators and law enforcement officials on financial misconduct may be constraining global growth, some officials warn.

Legal expenses are among the burdens weighing on banks, policy makers say. "The roughly $275 billion in legal costs for global banks since 2008 translates into more than $5 trillion of reduced lending capacity to the real economy," Minouche Shafik, a deputy governor of the Bank of England, told a New York conference of regulators and bankers Thursday.