12 C.F.R. § 1271.21
(b) Subpoena. In the event a Bank receives a subpoena for confidential regulatory information issued by a Federal, state or local government department, agency, court or bureau, the Bank shall give timely written notice of such subpoena to the financial regulatory agency from which the confidential regulatory information was obtained, unless such notice is prohibited by applicable law. Except as limited in this subpart, the Bank may disclose confidential regulatory information pursuant to the subpoena, after giving timely written notice, when:
(d) Disclosure to FHFA.