KEY TAKEAWAYS:

Zions, Western Alliance , and Jefferies reported recent bad loans, causing sharp stock declines.

JPMorgan CEO Jamie Dimon warned more problematic loans may emerge at regional banks .

Federal Reserve repo facility usage signals short-term liquidity concerns among banks.

Regional banks remain vulnerable due to concentrated exposure to commercial and real estate loans.

Wall Street is concerned about the health of the nation’s regional banks, after a few of them wrote off bad loans to commercial customers in the last two weeks and caused investors to wonder if there might be more bad news to come.

Zions Bank , Western Alliance Bank and the investment bank Jefferies surprised investors by disclosing various bad investments on their books, sending their stocks fallin

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