Have you tried your local CPA society? There are usually CPE offerings on the topic.
Cannon Financial offers the gold standard in trust training and our local CPAs have all been there. (And so have your trust officers! My trust officer still shoots me a training flyer every now and then.) There are also seminars and newsletters through The Firma.
You should also search the Institute of Internal Auditors. Don’t know what they’ve had recently, but it’s worth looking into.
The big question for me was always - - how complex are the department’s activities?