12 CFR § 7.3000 - National bank and Federal savings association operating hours and closings.
(a) Operating hours. The board of directors of a national bank or Federal savings association, or an equivalent person or committee of a Federal branch or agency, should review its hours of operations for customers and, independently of any other bank, savings association, or Federal branch or agency, take appropriate action to establish a schedule of operating hours for customers.
(b) Emergency closings declared by the Comptroller. Pursuant to 12 U.S.C. 95(b)(1) and 1463(a)(1)(A), the Comptroller of the Currency (Comptroller), may declare any day a legal holiday if emergency conditions exist. That day is a legal holiday for national banks, Federal savings associations, and Federal branches or agencies in the affected geographic area (i.e., throughout the United States, in a State, or in part of a State), and national banks, Federal savings associations, and Federal branches and agencies may temporarily limit or suspend operations at their affected offices, unless the Comptroller by written order directs otherwise. Emergency conditions may be caused by acts of nature or of man and may include natural and other disasters, public health or safety emergencies, civil and municipal emergencies, and cyber threats or other unauthorized intrusions (e.g., severe flooding, a pandemic, terrorism, a cyber-attack on bank systems, or a power emergency declared by a local power company or government requesting that businesses in the affected area close). The Comptroller may issue a proclamation authorizing the emergency closing in anticipation of the emergency condition, at the time of the emergency condition, or soon thereafter. In the absence of a Comptroller declaration of a bank holiday, a national bank, Federal savings associations, or Federal branch or agency may choose to temporarily close offices in response to an emergency condition. The national bank, Federal savings associations, or Federal branch or agency should notify the OCC of such temporary closure as soon as feasible.
(c) Emergency and ceremonial closings declared by a State or State official. In the event a State or a legally authorized State official declares any day to be a legal holiday for emergency or ceremonial reasons in that State or part of the State, that same day is a legal holiday for national banks, Federal savings associations, and Federal branches or agencies or their offices in the affected geographic area. National banks, Federal savings associations, and Federal branches or agencies or their affected offices may close their affected offices or remain open on such a State-designated holiday, unless the Comptroller by written order directs otherwise.
(d) Liability. A national bank, Federal savings association, or Federal branch or agency should assure that all liabilities or other obligations under the applicable law due to its closing are satisfied.
(e) Definition. For the purpose of this subpart, the term “State” means any of the several States, the District of Columbia, the Commonwealth of Puerto Rico, the Northern Mariana Islands, Guam, the Virgin Islands, American Samoa, the Trust Territory of the Pacific Islands, or any other territory or possession of the United States.