JPMorgan, the largest U.S. lender, has retained 90% of First Republic customers since the purchase in May.

"We have done the home lending integration, mortgage origination and servicing already," Lake told investors at the Goldman Sachs U.S. Financial Services Conference on Tuesday. "We're going to do the deposit migration and integration by the middle of next year."

First Republic Bank was the largest U.S. lender to fail since 2008. The deal fueled JPMorgan's profits in the third quarter beyond Wall Street expectations, and the integration is going better than expected, executives said.

Consumer spending continues to be robust and is now in line with pre-pandemic levels, Lake said. Credit card loan growth is expected to reach double-digit percentages next year, but stay lower than 2023 levels, she said.

Mortgage lending is expected to remain flat, Lake added.

U.S. consumer confidence rose in November after declining for three consecutive months.

Americans are also planning to buy big-ticket items such as motor vehicles and houses over the next six months even as interest rates remain high.

But consumers with low credit scores are beginning to show signs of stress, with cash buffers shrinking for the lowest-income customers.

Separately, Lake said that the bank's net interest income is expected to exceed executives' earlier guidance. She previously served as the bank's finance chief.

Revenue from trading is expected to be flat in the fourth quarter while investment banking revenue will probably grow by a single-digit percentage, Lake added.

(Reporting by Nupur Anand in New York; Editing by Lananh Nguyen and Stephen Coates)

By Nupur Anand