Of course, because the central banks have the ability to both create and destroy money at will according to policy determined by the voting members (The gangsters... err I mean Banksters), they don't need to earn a profit to accumulate assets and they don't need to take a loss to reduce assets. They simply type a few numbers on a computer and Voila!!! Money (assets) is created or destroyed in microseconds.
Those who say it cannot be done should not interrupt those who are doing it