The Clydesdale Bank of Scotland was a Scottish commercial bank, the smallest of the three in Scotland until its establishment in Glasgow in 1838. It was independently owned and operated until 1920 when it was acquired by Associated Bank, then in 1987 it was sold to its current owner, the National Australia Bank. In 1863, Clydesdale Bank was more successful in acquiring the Bank of Eastern Scotland, whose head office is in Dundee, and which has two separate offices, one in Dundee and the other in Edinburgh.