- Silicon Valley Bank was taken over by US regulators on Friday.
- Banks bought bonds with their bounty of cheap deposits but as rates have jumped in the past year, the bonds have sunk in value, creating as much as $600bn in paper losses.
- Investors are getting a better picture of the risks some banks have been taking with their excess deposits.
- $4.2tn in deposits poured into US banks over the past three years, with only 10% going to new lending.
- Banks with big Treasury books have the most problems, with BofA's losses in the past year on its securities portfolio rising to over $110bn.
Cheap deposits have become a painful pandemic hangover for US banks
Rising rates have slashed the value of bonds that lenders such as Silicon Valley Bank bought with customer money
