(a) A state trust company may not pledge or create a lien on any of its assets except to secure:
(1) the repayment of money borrowed;
(2) trust deposits as specifically authorized or required by:
(A) Section 184.301;
(B) Title 9, Property Code; or
(C) rules adopted under this chapter; or
(3) deposits made by:
(A) the United States;
(B) a state, county, or municipality; or
(C) an agency of the United States or a state, county, or municipality.
(b) An act, deed, conveyance, pledge, or contract in violation of this section is void.