How to validate authenticity of app downloaded from App Store?

How can I be sure that an app I download from the App Store is indeed from the vendor it is supposed to be? Anyone with a developer account can potentially pretend to be for example "a bank" and sell a fake app through the App Store.

The only way I can think of is that you go to the website of your bank, verify the SSL certificate and from there follow a direct HTTP link to the App Store.

Any other way of making sure the app is authentic?