Struggling to find their way amid an ongoing economic-data blackout and renewed trade-war tensions between the U.S. and China, investors already had enough to worry about this week.

Then a regional lender piled on one more thing: Another large credit loss, possibly stemming from fraudulent activity. In a regulatory filing published Wednesday evening, Salt Lake City-based Zions Bancorp

ZION revealed that it would include a loan-loss provision of $60 million in its third-quarter earnings, which the bank is set to release later this month.