Many authorities have said it: banks do not lend their deposits. They create the money they lend on their books.
Robert B. Anderson, Treasury Secretary under Eisenhower, said it in 1959:
When a bank makes a loan, it simply adds to the borrower’s deposit account in the bank by the amount of the loan. The money is not taken from anyone else’s deposits; it was not previously paid in to the bank by anyone. It’s new money, created by the bank for the use of the borrower.