Maryland Code, Courts and Judicial Proceedings § 5-507

(a)(1) An official of a municipal corporation, while acting in a discretionary capacity, without malice, and within the scope of the official's employment or authority shall be immune as an official or individual from any civil liability for the performance of the action.

(2) An official of a municipal corporation is not immune from liability for negligence or any other tort arising from the operation of a motor vehicle except as to any claim for damages in excess of the limits of any applicable policy of motor vehicle liability insurance.

(b)(1) Subject to paragraph (2) of this subsection, a municipal corporation shall provide a defense for an official of the municipal corporation for any act arising within the scope of the official's employment or authority.

(2) A municipal corporation shall only provide a defense for an official of the municipal corporation for negligence or any other tort arising from the operation of a motor vehicle as to any claim for damages in excess of the limits of any applicable policy of motor vehicle liability insurance.