According to GP's linked article it's true when looking at the banking sector as a whole. For a single bank it seems like more of a technicality. Also from the

According to GP's linked article it's true when looking at the banking sector as a whole. For a single bank it seems like more of a technicality. Also from the article: > For example, if all of the deposits that a bank held were in the form of instant access accounts, such as current accounts, then the bank might run the risk of lots of these deposits being withdrawn in a short period of time. Because banks tend to lend for periods of many months or years, the bank may not be able to repay all of those deposits — it would face a great deal of liquidity risk.