Yes, but it does not mean that bank cannot accept bitcoin. They do not have to necessarily control some asset, to have a stock of it and lend it to other people.
If banks in every countries would apply possible bank bitcoin loans, that would be a great opportunity for every kind of investors and people willing to start they own, small business.

However im afraid that is not possible. Banks are way too afraid of bitcoin to implement it in a such way, because there is basically no way to control the bitcoin, except using the market.
It requires a big amount of money which bank has, but still the market capitalization is really high which may be a roadblock for such a manipulaton.

In my opinion, there is no chance to see any kind of bank accepting bitcoin.