I just realized that searching HN for "SVB" by date gives you a blow by blow account of what happened to SVB. According to the HN timeline the trouble began 9 days ago. That'll be around March 9th.
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=SVB&sort=byDate&type=story
https://news.ycombinator.com/item?id=34913887