N.J. Stat. § 36:1-4
The payment, certification or acceptance of any check or other negotiable instrument or any other transaction by any bank or trust company, banking institution or savings and loan association shall not be void or voidable or invalid because done or performed on a day designated in R.S. 36:1-1 as a public holiday, including Saturday between 12 o'clock noon and midnight, if such payment, certification, acceptance or other transaction would be valid if done or performed at a time or on a day which is not designated as a public holiday. Nothing herein contained shall be construed to compel any bank or trust company, banking institution or savings and loan association to keep open, or to perform any of the acts or transactions aforesaid, on any Saturday after 12 o'clock noon or on any day designated as a public holiday except at its own option.
N.J.S. § 36:1-4