plaintiff elect to pledge an interest-bearing time deposit, we must next determine whether that portion of section 6 prohibiting escrow waiver fees is preempted by federal law.
The supremacy clause of the United States Constitution states that "the Laws of the United States shall be the supreme Law of the Land; any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.” U.S. Const., art. VI, cl. 2. Congress’ purpose " 'is the ultimate touchstone’ of pre-emption analysis.” Cipollone v. Liggett Group, Inc., 505 U.S. 504, 516, 120 L. Ed. 2d 407, 422, 112 S. Ct. 2608, 2617 (1992), quoting Malone v. White Motor Corp., 435 U.S. 497, 504, 55 L. Ed. 2d 443, 450, 98 S. Ct. 1185, 1190 (1978). "Congress’ intent to preempt State law may be manifested 'by express provision, by implication, or by a conflict between federal and state law.’ ” Busch v. Graphic Color Corp., 169 Ill. 2d 325, 335 (1996), quoting New York State Conference of Blue Cross & Blue Shield Plans v. Travelers Insurance Co., 514 U.S. 645, 654, 131 L. Ed. 2d 695, 704, 115 S. Ct. 1671, 1676 (1995).
When reading the Escrow Act to include a prohibition against escrow waiver fees, defendant claims that the federal Depository Institutions Deregulation and Monetary Control Act of 1980 (DIDMCA) (12 U.S.C. § 1735f — 7a (1994)) preempts the Escrow Act. DIDMCA states in relevant part: "The provisions of the constitution or the laws of any State expressly limiting the rate or amount of interest, discount points, finance charges, or other charges which may be charged, taken, received, or reserved shall not apply to any loan, mortgage, credit sale, or advance” made after March 31, 1980, and secured by a first lien on residential real property. 12 U.S.C. § 1735f — 7a(1) (1994).
We must initially determine whether the Escrow Act’s prohibition of an escrow waiver fee falls under the