Another in the series of Introductory videos to mark the publication of "The Principles of Banking, 2nd Edition", here is three minutes on "maturity transformation" and "banking intermediation". I should point out that although a bank takes deposits and originates loans, it keeps both on its own balance sheet until product maturity; so the definition of "intermediation" here does not imply a "broker". The bank doesn't need the other side to complete the deal on either side (although it does need to fund a loan!). Further discussion in Chapters 1 and 5 of the book.
The Principles of Banking, 2nd Edition by Professor Moorad Choudhry:
https://amzn.to/3HiXAqQ