Muscling its way to prominence in the crowded New York-area market, North Fork Bancorp has agreed to buy North Side Savings Bank for $210 million in stock.

The deal, announced Monday, follows a series of acquisitions by the Mattituck, N.Y.-based company. It would boost North Fork's assets by $1.7 billion, or 41%, and move it to No. 7 from No. 10 in deposits in the key market of Long Island and Queens.

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