How do I buy Bitcoins with blockchain bank?

Could you please elaborate on the process of purchasing Bitcoins through a blockchain bank? I'm curious about the steps involved and any specific requirements I may need to fulfill. Is it a direct transaction, or do I need to go through a third-party service? Also, what are the typical fees associated with such a purchase? Additionally, are there any security measures I should be aware of to ensure a SAFE and secure transaction? Thank you for your assistance in clarifying this process.