Via Reuters:

Private sector deposits in Greek banks fell by almost 3 percent in January after a slight increase in December, with the total falling to 174.9 billion euros, the lowest level since November 2006.

They are now about 28 percent below their peak in December 2009.

Greek banks are one of the biggest victims of the crisis there. They weren’t overly leveraged, risky or poorly run. Their sin was lending the Greek government €30 billion.