When bank and securities regulators announced a plan in  March to promote a "clearer understanding" of loan-loss reserves, bankers   were encouraged. An end to months of contradictory signals seemed to be in   sight.     
But the cooperative spirit among regulators was short-lived. If  anything, the rules on loan-loss allowances have grown murkier. 
  
On one side stands the Securities and Exchange Commission. Duty-bound to  make bank finances transparent to investors, and obsessed, critics say,   with the notion of accounting purity, the SEC has repeatedly warned banks   not to use reserves as a "cookie jar" to level out earnings.     
On the opposite side stand the bank and thrift regulators. Guardians of  the depositor and taxpayer, always looking out for fading loan quality and   economic malaise, these agencies argue that reserves are a vital hedge   against the unknown.     
  
Both camps have claimed the moral high ground. That is why the March  agreement, in which they embraced each other's institutional values, was so   extraordinary. Regulators finally appeared ready to speak with a single   voice.     
Moreover, they offered a clear-cut plan for revamping the loan-loss  landscape. Three groups would divide the work and recommend changes over   the next two years. Together, they would create order.   
But a recent spate of unilateral moves and interagency dart-tossing has  begun to undo the bonds, further confusing bankers. 
  
It did not take much to melt the glue. The catalyst was an article  published April 12 by the Financial Accounting Standards Board, one of the   three groups working on updating the rules.   
Weeks before the article was published, bank regulators urged the quasi-  private agency to let banks comment on a draft. FASB refused. 
The SEC also turned a deaf ear. In addition to endorsing the FASB  article May 20, the agency told banks that, if necessary, they should make   a one-time, no-fault adjustment to their reserves in their next quarterly   financial statements.     
Three banking agencies-the Office of the Comptroller of the Currency,  the Federal Deposit Insurance Corp., and the Office of Thrift Supervision-   responded by firing off a letter the next day to ranking members of the   House and Senate banking committees. They said banks might interpret the   SEC's announcement as a directive to reduce reserves.       
  
Congressional hearings are scheduled for later this month. Meanwhile,  Sen. Richard C. Shelby, R-Ala., is demanding the SEC provide a list of all   banks being examined for possible loan-loss irregularities.   
But the FASB article did not just reopen the fissure between securities  and bank regulators. It also created a gap between the bank regulators   themselves.   
The Federal Reserve Board did not sign the May 21 letter to Congress. It  also was alone in issuing guidelines on the latest loan-loss developments,   including the FASB article and the SEC endorsement.   
It was the first time that the four bank agencies have not acted jointly  on the issue since this controversy erupted last fall. The rift began when   the SEC delayed SunTrust Banks Inc.'s acquisition of Crestar Financial   Corp. until Atlanta-based SunTrust agreed to restate its 1994-1996 earnings   and cut reserves by $100 million.       
For all the high drama, however, what divides the banking agencies is  not entirely clear. 
All four continue to voice the same conclusions on substantive  questions. For example, an FDIC official recently said his agency did not   disagree with a single line in the Fed's guidelines, and is considering   sending a very similar letter to its own banks.     
Then why not act in sync? Plenty of rumors are circulating. One has the  Fed siding with the SEC to ensure solidarity on financial reform   legislation. But both agencies have other, unrelated reasons for their   common position.     
Another idea is that the Fed was trying to prevent an imminent SEC  crackdown on a large Fed-regulated bank's reserves. But that also seems   unlikely, particularly since Bankers Trust Co., one of the Fed's three   largest banks, recently disclosed that the SEC is investigating its   reserves.       
The real reason tensions resumed between securities and bank regulators  is simple: Despite their March agreement, neither camp has broadened its   view. The SEC continues to think banks are overreserving, while bank   regulators worry they are not reserving enough.     
The drama is far from over. Under the March agreement, a joint group of  securities and bank regulators are assembling a list of "best practices"   for documenting and disclosing probable loan losses, with a target date of   March 2000.     
Separately, the American Institute of Certified Public Accountants'  loan-loss task force is working to clarify for banks the difference between   current and future losses in a loan portfolio. Those guidelines are due in   about two years.