I don't think there is anything such as a bitcoin savings account. What you are asking is for a bitcoin bank which does not exist as of now. And it doesn't make much of a sense to have a bitcoin bank as that would lead to centralization and  bitcoin aims to decentralize money.

Taking abut banks, there is a project known as Polybius which aims to be a crypto funded bank. The ICO is still going on. And is about to hit their target. Check  ico.polybius.io