Yeah. Until now, such concept hasn't become a reality for Bitcoin or any other digital currency. However, when it does it will truly become revolutionary as it will allow anyone to safely deposit and withdraw Bitcoin and other altcoins, as well as bring the advantages of interest rates on savings accounts, and more.
Recently, there has been an ICO launched for Polybius bank which aims to become sort of like a bank for blockchain currencies. If it serves its purpose well as a bank for cryptocurrencies, then we should look no further as this will bring us all the goodness from traditional banking.
But until it launches officially, we could enjoy other ways to make our Bitcoin grow with savings rates. Bsave, Magnr, and other services offer you interest rates annually by allowing you to save your Bitcoin within them. Lending is also another option, but it is too risky. Just sharing my thoughts.