It is the largest-ever closure plan by the company and will radically change the face of the bank, according to Unite.
Games City Hosts Trade Conference
Politicians and business leaders will gather to promote trade and investment across the Commonwealth as the opening ceremony for the Glasgow Games approaches.
The Commonwealth Games Business Conference, which opens today and concludes tomorrow, will feature speeches from Scotland's First Minister Alex Salmond, Governor of the Bank of England Mark Carney, senior UK Cabinet ministers and UK Trade Minister Lord Livingston.
The event aims to provide a platform for businesses to meet and create new partnerships.
An audience of more than 200 chief executive officers and political leaders from across the Commonwealth are due to attend.
The conference, to be held at Glasgow University, is jointly hosted by the Scottish and UK governments and their trade and investment agencies, Scottish Enterprise and UK Trade & Investment.
Key areas for discussion include innovation, infrastructure investment, sustainable trade and financing economic growth.
Mr Salmond is due to speak today, with Scottish Finance Secretary John Swinney closing the session later in the day.
Mr Carney will address the conference tomorrow just hours before the Commonwealth Games opening ceremony gets under way across the city at Celtic Park.
The SNP claims a "Hard Brexit" will cost 80,000 jobs in Scotland.
A bullet has been recovered from a tree where a man was shot near a primary school.
Scotland's jobless total rose by 11,000 in the three months to November.
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