It appears a branch visit is required to open an account. Branches are located in Phoenix and Scottsdale, Arizona.
Bank USA is part of the bank holding company FBOP Corporation which has several other banks in California, Texas and Illinois. These banks often offer similar rates. I've checked several of them, and many also have competitive 12-month CD rates, but Bank USA has the highest. A list of these other banks are available in this post. These banks also continue to offer a bonus for opening a checking account (see post).
Bank USA's ratings for safety and soundness are weak: 2 stars (problematic) at BauerFinancial and 1 star (lowest) at Bankrate.com. Both ratings are based on 3/31/09 financial data. The bank has been a FDIC member since 1984 (FDIC Certificate # 32218).
Other Competitive Certificate of Deposit Rates