Notwithstanding any other provision of law, any financial institution subject to the provisions of this title shall cooperate in any investigation of alleged adult abuse, neglect, or exploitation conducted by a local department of social services pursuant to Chapter 16 (§ 63.2-1600 et seq.) of Title 63.2 and shall make any financial records or information relevant to such investigation available to the local department and to any court-appointed guardian ad litem for the adult who is the subject of such adult protective services investigation upon request to the extent allowed under the Gramm-Leach-Bliley Act (15 U.S.C. § 6801 et seq.) and 12 U.S.C. § 3403. Absent gross negligence or willful misconduct, any financial institution and its staff shall be immune from civil or criminal liability for providing information or records to the local department of social services or to a court-appointed guardian ad litem pursuant to this section.