The Justice Department has opened an investigation into the collapse of Silicon Valley Bank and the actions of its senior executives, according to a person familiar with the matter who spoke on the condition of anonymity to describe the early-stage inquiry. The development comes as worries eased on Wall Street on Tuesday over the health of regional banks. Washington’s banking rescue had a rocky start Monday, as the government response to the SVB collapse left investors wondering what the Federal Reserve would do next in its rate-hike campaign.