Mo. Rev. Stat. § 362.560: Trust guaranty fund.

The directors of any state or national bank or trust company qualified to act as fiduciary in this state may from time to time set apart, as a trust guaranty fund, such portion of the profits as they may consider expedient. The fund shall be invested in such securities only as are legal for the investment of trust funds. The accounts of this fund shall be kept in the trust department.