The reasons vary, but after a long and virtually unblemished run of profitability growth that powered bank stocks to new highs, a few disappointments have crept into their earnings.

Several analysts wonder whether the next letdown could come as early as today when First Chicago NBD Corp. unveils its second-quarter results. If so, loan quality in its big credit card business could be the main reason.

Limited Time Offer

Save $400 off your subscription. Special offer ends April 30, 2017.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.