Then when the pandemic subsided, people started burning down their savings accounts, and interest rates started skyrocketing. All the banks' money was tied up in all these 30-year mortgages that nobody wants anymore because they're paying like 2.5% and inflation is 8% now, but they're still forced to sell them for terrible prices just to keep their ATMs full. Eventually word gets out about what's happening, there's a bank run, and the bank starts death spiraling.
Massive banks have nothing to worry about because if the government allows them to fail they'll take the entire economy down with them. And (presumably) smaller banks weren't under the same pressure from investors to generate returns on idle capital, so they didn't commit the same sins as the midsize banks.
First Republic fail was because of large pool of fixed rate assets....(jumbo low-rate mortgages and Treasury Notes) in a rising rate context. They also had an affluent clientele and thus a high % of uninsured deposits. The fixed rate assets lost so much value while rates rose, that they had no tangible equity. Thus, the hot money deposits raced out of the bank.
Smaller banks typically don't have such a concentration of affluent customers, which means that more of their clientele would be under the threshold for FDIC insurance. Smaller banks probably have a good book of commercial loans which are commonly priced at a variable rate.
I am baffled that SVB and FRB did not hedge their fixed rate portfolios with interest rate swaps....Maybe their mind was on staying abreast of the white-hot tech sector instead of wringing their hands about the next Fed rate decision.