I’ll give some background.
What has happened to SVB is an ongoing risk to smaller banks up during an inflationary period meaning this will linger on for many years.
2020-22 people deposited oodles of money in banks. Banks purchased govt 2yr-10yr treasuries with those deposits. treasury price goes up if rates fall, treasury price goes down if rates rise.
So these banks Bought a stack of treasuries paying 0.5%. Today it’s 3.5% meaning the price has fallen considerably vs 2021. Now, it’s ok providing nobody wants their money and you can hold out for maturity. However, if people want their money (which is what has happened) the banks must sell their treasuries on the market. Because they have 0.5% treasuries vs 3.5% it’s discounted heavily and they no longer can cover their deposits.
This hasn’t been a problem for over a decade with falling rates making the treasury more valuable. In an inflationary cycle we do the reverse. Rates rise for years making the price of treasuries less valuable over time and therefore a risk on asset for a bank if you get a run on deposits.