GMAC Mortgage has agreed to purchase $4.7 billion of home mortgage servicing rights from a privately owned mortgage company in Dallas.

The deal with STM Mortgage Co., which is expected to close in January, would boost GMAC's servicing portfolio to $45.5 billion. It would also bring down the curtain on STM, which was launched in the late 1980s by H.R. "Bum" Bright, managing director of Bright & Co., Dallas, and a former owner of the Dallas Cowboys.

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