SVB was forced to sell a lot of assets to create the cash to pay out deposit outflows on Thursday. As that process happens they were left with fewer and fewer assets that could be sold without a lose (their intention was to hold a lot of these assets to maturity, which is allowed). The bulks of their assets themselves are mostly liquid (not the actual venture debt, etc) but as you sell the assets in the order of their value relative to mark-to-market, their book took on more and more loses. By the end of the day they were insolvent to the tune of nearly negative $1B -- with all shareholder equity wiped out. The point being that the FDIC can sell their remaining assets into the market (it wasn't a liquidity crisis in THOSE markets) and eventually that will net out to some haircut for depositors.