The Office of Thrift Supervision this week approved two major thrift deals, granting Washington Mutual Inc. permission to acquire H.F. Ahmanson & Co. and Astoria Financial Corp. the go-ahead to buy Long Island Bancorp.

Washington Mutual's transaction is expected to close Oct. 1. The new thrift would have more than $150 billion of assets, making it the seventh- largest financial institution in the country.

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