I'm no expert but from what I understand SVB didn't do everything right. Failure of risk management. Invested too much in long-term securities in search of higher rates than short-term securities when interest rates were already low. Failed to appreciate how fast they could suffer a bank-run with a clientele of highly interconnected and tech industry individuals and companies. Also failed to appreciate its clientele was exactly the ones who would suffer when interest rates rise and would start withdrawing money.