I seriously doubt that you will find the type of matrix that you are looking for. The Trust area is a unique beast unto itself and the types of risks that the area may be exposed to will vary greatly on a number of factors.
For instance:
What types of products/services does your trust area offer? Personal, Irrevocable, ILITs, Agencies, Custodials, IRAs, ERISA Qualified Plans, Non-Qualifieds, etc.
What is your level of service? Does the bank assume the role of trustee with fully investment authority and responsibility?
Are you operating in an in-house or an out-sourced type of environment?
What is the experience level of the trust staff?
What is the level of oversight of the asset management area? Do you have regular internal audits of the area or do they tend to just skim over the trust area? Does executive management really understand the trust area and the inherent risks in the area?
I could keep going, but suggest that you might want to sit down and identify what you believe the risk areas are then interview management in that area to see if you share the same perceptions. Discuss where your perceptions differ than together put together a plan.
You might want to visit the Fiduciary and Investment Risk Managmenet Associations site at
http://www.thefirma.org. This organization is devoted to the compliance and audit side of the fiduciary world. Also since you are in Missouri, you might want to see if there is anything available through the Missouri Banker's Association. I believe that they along with Kansas have an annual MOKAN Trust Conference annually.