HSBC Bank USA, National Association, the American subsidiary of UK-based HSBC Holdings plc, is a bank with its operational head office in New York City and its nominal head office in McLean, Virginia . HSBC Bank USA, N.A. is a national bank chartered under the National Bank Act, which means that it is regulated by the Office of the Comptroller of the Currency , a part of the U.S. Department of the Treasury. The Hongkong and Shanghai Banking Corporation acquired a 51% shareholding in Marine Midland Bank of New York State, headquartered in Buffalo, New York, in 1980 and extended to full... ownership in 1987. The banks continued to operate under the Marine Midland name until 1998, when the branch offices were rebranded as HSBC Bank USA in line with the worldwide corporate identity of HSBC. In 1994, Marine Midland acquired Spectrum Home Mortgage, which operated in eight states. Then in 1995, Marine acquired United Northern Federal Savings Bank, with branches in Watertown and Lowville, New York.
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