Deposit levels at five of Spain’s top six banks declined in the third quarter, while five of Italy’s largest lenders also reported declines, according to a report by analysts at Citigroup. In some cases, individuals pulling their money out of a bank are instead buying the bank’s bonds, which have offered hefty interest rates lately. But corporate clients, who find it relatively simple to move cash from one international bank to another, appear to have been especially aggressive in scaling back their deposits at southern European banks. Spain and Italy’s largest banks each reported declines of at least 10% in the quarter that ended Sept. 30.