The FT's US banking correspondent Stephen Gandell talks about the state of regional banks. He says Silicon Valley Bank was an extreme case, but many other lenders are more diversified. But profits at some local banks have fallen by as much as 50% in recent years due to added risk from their customers and bad loans for commercial real estate developers. "What we're watching for is whether that shrinks to the point where some of these banks say, hey, you know, maybe we can't"