Regional banks like Zions Bank, Western Alliance Bank, and Jefferies are causing concern on Wall Street after revealing bad loans to commercial customers. JPMorgan Chase CEO Jamie Dimon warned of potential problems ahead. The KBW Bank Index is down 7% this month, and Federal Reserve data shows banks tapping into overnight “repo” facilities. Larger banks also faced losses, highlighting the vulnerability of regional banks in the economy.

Read more at Yahoo Finance: Regional banks’ bad loans spark concerns on Wall Street