How could that happen with bitcoins? If the bank lends 100btc to someone, then he hast the btc and the bank has 0 btc. If he then deposits them on a bank, then there are 100btc. No btc were created.
there are still also 100 btc in the account of the depositor whose money was used for lending. -> 200 btc in bank deposits.
no BTC were created on the bitcoin network of course. but in the same case with USD no USD were created by the central bank either.
in both cases, it's just two people who have a deposit of 100 each at the bank ( = 200), even though there was only 100 in the beginning.
this is entirely related to the definition of money: not only central bank money (equivalent to "money on the bitcoin network) is money, but bank deposits, too.
even 2 year govt bonds are considered money by some definitions(aggregates). so if you buy a 2 year govt bond for 1000$, you give 1000$ to the govt and you are holding 1000$ worth of bonds - both of which are considered money and the money supply increases by 1000$ to 2000$.
there really is no "printing of money" at commercial banks, neither with bitcoin nor with USD.
this kind of "money multiplying" is encouraged by central banks and the FDIC, so it might be less in a bitcoin economy. but that's another story, and who knows for sure. it could exist though, so this is no difference from the current system.
