Note to investors: A veteran banking observer suspects the industry's almost decade-long business boom is running on borrowed time.

"While banks keep setting new profitability records, the regulators' data show a very definite flattening-out pattern," said the researcher, Warren G. Heller.

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.