(a) A trust company may not pledge or create a lien on any of the assets belonging to the trust company except to secure

1. (1) the repayment of money borrowed;
2. (2) trust deposits as specifically authorized or required by AS 06.26.370 or by regulations adopted under this chapter; or
3. (3) deposits made by the United States government, the state, or a municipality, or an agency of those governmental bodies.