Question About Marital/separate Property And Previous Custodial Account That I Took Ownership Of After Getting Married.

Ok, I have no doubt that this will vary by state, so right now I'm looking for general information that will help me in my own personal research.
General situation:
My parents created a custodial investment account for me (i.e. college fund) when I was a child. I have since taken full control of that custodial account and have gotten married.
Questions:
Is that account treated as marital property or as separate pre-marital property?
Are there any situations that might change the status of the account?
If it does become marital property, is the entire account considered marital property or only the change in balance? How is that calculated in terms of withdrawals and deposits?
Thanks all. I'll do my best to come back and make updates to any clarifying questions that get asked.
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