Commerzbank, one of Germany’s biggest lenders, is examining the possibility of hoarding billions of euros in vaults rather than paying a penalty charge for parking it with the European Central Bank, according to sources familiar with the matter .. “Such a move by a bank part-owned by the German government would represent one of the most substantial protests yet against the ECB’sultra-low rates, which have been criticised by politicians including Finance Minister Wolfgang Schaeuble.”