WASHINGTON — Despite near-constant warnings from regulators, large U.S. banks failed to anticipate the problems now roiling their commercial loan portfolios, the Federal Reserve Board said Friday.

The central bank’s third-quarter survey of senior loan officers found that among banks with $20 billion or more of assets, 64% said deterioration of their business loans in the past two years had been worse than expected. That includes 14% who characterized the weakening as “much greater” than predicted.

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