a bank holding company described under subparagraph (A) that is not subject to enhanced supervision and prudential standards, the Council shall perform an additional review under subparagraph (A) of such company if— (i) the Council finds that the nature, scope, size, scale, concentration, interconnectedness, or mix of the activities of the bank holding company have significantly changed and the company should be reviewed again to determine if it may pose a threat to the financial stability of the United States