Actually MB is partially correct...
In the case of the 'Cyprus Haircut' in their banking system the ECJ which pronounces on EU law says:
"The haircut of private deposits did not violate the right to property, as it did not disproportionately and unacceptably interfere with the substance of depositors’ property rights"
The UK was of course in the EU at the time, but this part of law is still in place...
ASFAIK the EHCR has not ruled on this issue...
There has been a depositor victory (currently under appeal), but that was based on the fact that "the Republic of Cyprus, had been negligent in their handling of the financial crisis in 2009 and the lead up to the haircut"