Bank-America Corp. on Thursday created the nation's largest mortgage company by merging the mortgage units of NationsBank Corp. and BankAmerica Corp.

Bank of America Mortgage has a $250 billion servicing portfolio and an origination network stretching across 35 states and Washington, D.C. New signs went up in the company's stand-alone mortgage sales offices Thursday.

Offices in banking centers will display Bank of America Mortgage desk cards until the bank's state-by-state brand transition is complete, the company said.

The $43.1 billion merger of NationsBank Corp. and Bank-America Corp. closed Sept. 30.

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