Hi Shiny Dark Apples,
Welcome to the community! Here is an excerpt from our Easy Deposit FAQ page, which will hopefully shed some light on the hold you are experiencing:
All USAA Easy Deposit items are subject to a hold and may not be available for immediate withdrawal. Items transmitted using this service are not subject to the funds availability requirements of Federal Reserve Board Regulation CC. Funds deposited using this service will be available after USAA receives payment for the funds submitted. USAA may make such funds available sooner based on such factors as credit worthiness, the length and extent of your relationship with us, transactions and experience information, and such other factors as USAA, in its sole discretion, deems relevant. Refer to the USAA Depository Agreement (PDF)for further information.
Thank you for posting!