Your bank doesn’t depend only on cryptography. It would be still a lot of effort to simply make transfer from a bank account. Quantum computer will not magically give an answer for a password of a hash you don’t have. TLS is moving to post quantum as we speak.

For crypto currency you have all the data you need to break whole system ready in your hands as you will be able to produce private key from public keys of wallets. Cryptocurrency depends only on cryptography.