WASHINGTON — President Trump in 2018 repeatedly urged the Federal Reserve to stop raising interest rates, warning that its “crazy” policies were jeopardizing the economic expansion.

This week, the Fed stopped. The central bank did not raise its benchmark rate at its first meeting of 2019, and said it had no plans to raise rates in the foreseeable future.

The Fed’s newfound patience delighted the White House, and Wall Street. It was seen as a concession to the Fed’s critics, and as a boost for an economic expansion that is on the verge of becoming the longest in the nation’s modern history.

“We have, by far, the strongest economy in the world!” Mr. Trump exulted Friday morning on Twitter.

But the details of the Fed’s decision suggest less cause for celebration.