"One thing to keep in mind is, credit scores may be less informative," Joelle Scally, a financial and economic analyst for the Federal Reserve Bank of New York says.

JPMorgan's Dimon said "you could see a fairly rapid recovery" but cautioned that the Fed "can't prop up the stock market forever."

Company travel bans, re-examination of sick leave policies and -- placing desks farther apart?

The scale of the breach ranks it as possibly one of the largest-ever impacting a U.S. bank.