Hopefully this wil change since they just invested millions into Coinbase.

http://www.pymnts.com/news/2015/nyse-usaa-and-bbva-make-75m-coinbase-investment/

BBVA Compass, and NYSE also, some pretty big financial companies, so hopefully threir investment departments will make a call down to their compliance and customer account teams letting them know were on the same side.

EDIT:  I did a transfer from USAA to Coinbase as a test 6 days ago, and it worked all good no blocks.  Maybe they want you to use Coinbase lol