Any loan getting repaid technically "destroys" the money unless new replacement lending is made. It's because the money was created when it was lent out, i.e. banks are allowed to lend money they don't have up to a point (called the reserve ratio). When it's repaid the interest is kept by the bank but the principal goes back to their balance sheet as money they can lend.

For central banks this is taken to the next level as I'm not sure they do anything with interest.