Earlier this month, I asked the leaders of a group of US-based companies what – if anything – they were doing to prepare for “Grexit”, or a possible exit of Greece from the eurozone. The responses from the manufacturers were rather vague.

The bankers, however, were alarmingly precise: amid all the speculation about Grexit, they told me, banks are increasingly reordering their European exposure along national lines, in terms of asset-liability matching (ALM), just in case the region splits apart. Thus, if a bank has loans to Spanish borrowers, say, it is trying to cover these with funding from Spain, rather than from Germany. Similarly, when it comes to hedging derivatives and foreign exchange deals, or measuring their risk, Italian counterparties are treated differently from Finnish counterparties, say.

The halcyon days of banks looking on the eurozone as a single current bloc are over; cross-border risk matters. To put it another way, while pundits engage in an abstract debate about a possible break-up, fracture has already arrived for many banks’ risk management departments, at least when it comes to ALM in their eurozone books.