Sterling Bancorp of New York said Tuesday that its fourth-quarter net income fell 4.8% from a year earlier, to $4 million, primarily because of a slowdown in mortgage originations, but it was a strong quarter by most other measures.

The $2.1 billion-asset company attributed a 13% increase in net interest income to higher average loan and investments securities balances and lower funding costs. Its net interest margin for the quarter rose 18 basis points from a year earlier, to 4.50%.

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