Bank OZK is the latest commercial real estate-heavy bank to announce plans to diversify its business. CEO George Gleason emphasized that he's confident in the bank's loan portfolio, but said he thinks misperceptions are dragging down the stock price.

The Dallas-based company, whose earnings per share fell short of consensus by 6 cents, lowered its revenue forecast and raised its expense outlook. Its stock price fell more than 8% on Thursday.

The Cleveland-based regional bank continues to benefit from strength in investment banking, though concerns about stalled loan growth emerged as CEO Chris Gorman described demand as tepid.

For at least the fifth consecutive quarter, the Providence, Rhode Island, company increased its allowance for credit losses on general office loans, which continue to be a problem area for banks.

The Charlotte, North Carolina-based bank saw profits and net interest income dip in the second quarter, but made up lost revenue through investment banking fees.

The Pittsburgh-based superregional bank reported a small quarter-over-quarter advance in net interest income, and it expects loan growth to pick up in the second half of the year. PNC, which announced job cuts last year, also said that it has identified an additional $25 million in cost savings.

Second quarter margins at the three big banks were lower versus three months' prior, missing Keefe, Bruyette & Woods expectations of a flat comparison.

Two days after the megabank was hit with $136 million of fines, Citi executives said they aren't changing the company's full-year expense guidance. Citi has 30 days to submit a plan to regulators showing that the bank has allocated enough resources to achieve compliance in a timely and sustainable manner.

Investment banking fees shot up at the nation's largest bank, thanks to rebounds in M&A and the equity capital markets segment. And despite higher credit costs in the company's card business, a top bank executive expressed confidence in the health of U.S. consumers.

The San Francisco bank's interest expenses continue to rise as depositors switch to higher-yielding options. At the same time, soft loan demand from business customers is putting a lid on how much interest Wells is collecting from borrowers.