this has hardly anything to do with bitcoin and its hype though!
the banks and financial institutions are interested in the technology and want to use it for their own benefit which usually translates into them creating their own altcoin which will most probably be closed source and surely centralized.

as for their investment, no bank is ever going to invest in cryptocurrenices. they may end up adopting bitcoin because it is a currency and they are working with currencies. but that would be about it and it may not happen for at least another 10 years.