There are no banks who accept bitcoin, but with the majority of banks you can withdraw money to an exchange and buy bitcoin.
I use kraken and when i want to buy bitcoins i just iniatiate a SEPA transfer and voila i can buy bitcoin.
So you mean that there are banks which do not receive the bitcoins but if I'll deposit some money in USD, for example, I sould withdraw them to my account in bitcoins? And what is the course? And is it profitable to use it? Also, there is the national course of the exchange rates and the commercial. what about the national course of bitcoins? I'm wondering..