Though Bank of America Corp. and Wells Fargo & Co. dominate correspondent mortgage purchases, GMAC Inc. is making a push to expand in the channel.

The company said Friday that it plans to set up a special unit that will purchase residential loans from community banks, thrifts and credit unions. To help win this business, GMAC's $42.5 billion-asset Ally Bank has formed a 40-person team that will offer training, technology, and underwriting and processing services to correspondents.

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