It's never a straight story from Greece
Ekathimerini news is reporting that the jump in deposits lately is not solely down to happy Greeks liquidating their mattress accounts in favour of bank accounts again, but comes via large pension payments, €718m's worth.
Netting off the data of private sector deposits, used to proclaim the return of deposits, from the pension payments via retail and corporate deposits, the net effect is actually zero (if I've read the translation properly)
The full details are here, in Greek
Thanks to @coffeeisforclo1 on twitter for the heads up