A real crypto bank is missing or it doesn't really matter as our wallets is the one that serves our bank accounts.
My idea is that a bank or an establishment that totally focuses with banking service but the currency will be in cryptocurrencies, mainly with bitcoin and few altcoins.
Bank for cryptocurrency will ruin the basic principle of being your own bank without the need to trust any 3rd party. However it might serve good purpose due to some people being used to ordinary banking which means that they are used to ask somebody for every trouble they have. They don't want to think for themselves. But banking with crypto should be secure, very secure. There are some banks trying to be made such as crypterium and bankera but we have yet to see what they can do.