There's no escaping the increasingly loud mutterings of discontent with the approach by Commonwealth Bank to their management of the escalating bad debts that are permeating the economy.Commentators are starting to point the finger, starting with Matthew Stevens' dissection in The Australian on Saturday, of the conduct of CBA's credit workout crew and their recalcitrant stand over the refinancing negotiations over, for example, Babcock & Brown and Centro group.Robert Gottliebsen in the Business Spectator yesterday reported that "at least one of the top four bank CEOs sent an urgent note to Commonwealth chief executive Ralph Norris urging him to change his mind given the likely severe consequences to Australia if Centro collapsed."In addition, Gottliebsen reported, "a number of other approaches were made to the top level of CBA." This must mean that the lobbying over specific credits is taking place at board level.One strong prospect for the other big bank CEO doing the heavying, by letter or otherwise, is that it is Gail Kelly at Westpac.One tale told in banking circles over the last couple of weeks is of a tough meeting between Kelly and Norris, instigated by Kelly at short notice and held in Norris' Sydney office early this month, over Westpac's annoyance at CBA's obstruction of the refinancing of B&B.Arguably an issue of rising importance in the banking sector, which is not confined to CBA or to Norris personally, is the lack of experience and management depth at all four big banks.Neither CBA nor ANZ have replaced the vacant posts of head of institutional banking and the experience of the management committees at all major banks can only be summarised as shallow.The worldwide recession generated by the credit crunch is still only in its early phase and the bad debt and wider risk management issues associated with this period of wealth destruction will present more complex problems than those forced on the industry in 2008.To take one more quote supplied to the AFR by Ralph Norris, the former chief information officer turned chief executive officer of the Auckland Savings Bank: "I have never seen anything like it."And nor have Westpac's Kelly, nor National Australia Bank's Cameron Clyne, nor many of their subordinates.