When First Bank System Inc. combines most of its nine banks into one on  June 1, the change will hardly cause a ripple. 
That's because Minneapolis-based First Bank, which plans to take  advantage of interstate branching under the Riegle-Neal Interstate Banking   and Branching Efficiency Act of 1994, has been operating as one bank for   several years even though legally it holds multiple charters.     
  
Yet for Cleveland-based KeyCorp, the move to consolidate charters is a  major departure. 
Having one bank is "living up to our brand image" as a national retail  bank, said Stephen Wall, president and chief operating officer of the newly   formed KeyBank. KeyCorp plans to have its 12 banks merged into one by   August. The maneuver would save the company less than $10 million, Mr. Wall   said, but should make it more efficient in the future.       
  
June 1 marks the date when companies can combine their charters under  Riegle-Neal. Only Texas and Montana have decided not to allow interstate   branching. Four states-Kansas, Missouri, Ohio, and Wisconsin-have not   formally acted, but it's believed they will each allow it.     
It's unclear how many banks are taking advantage of the law, but clearly  a number of big banks plan to centralize their operations. 
"Anecdotally, we've seen some movement, but there doesn't seem to be the  land rush some were expecting," said Ellen Lamb, a spokeswoman for the   Conference of Bank Supervisors.   
  
Though the law will provide new options to customers, like being able to  deposit money in banks across state lines, many companies are like First   Bank-they've already realized the advantages of operating like one company   from a technological and operational standpoint.     
First Union Corp. of Charlotte, for instance, said expense savings will  be small. The company will save about $6.5 million a year, said spokeswoman   Donna Stockton. First Union has 13 banks, and it plans to keep a separately   chartered bank in Delaware because of the insurance powers allowed under   the laws of that state. But the other 12 banks will be folded into one, to   be known as First Union National Bank, starting March 1, 1998.         
Wells Fargo & Co. will be known in all its states as Wells Fargo Bank,  as opposed to Wells Fargo Bank of Texas or Wells Fargo Bank of Colorado.   Wells has already folded eight of its 10 banks into its lead bank in San   Francisco. Colorado will be the last bank to fold in to Wells Fargo Bank in   June.       
Likewise BankAmerica Corp. has merged all but its Illinois and Texas  banks into its lead bank in San Francisco. The company is awaiting approval   from the Office of Comptroller of the Currency for the merger of the   Illinois bank. BankAmerica also has a thrift charter, BankAmerica FSB, that   operates in 31 states.       
  
NationsBank Corp. has a big task at hand. When it acquired Boatmen's  Bancshares of St. Louis in January, NationsBank inherited 57 banks, said   spokeswoman Mary Waller. NationsBank will merge its Georgia bank into its   Charlotte bank June 1 and has applications to merge 20 of the former   Boatmen's banks by mid-June. Eventually, the company wants to move to one   bank, but Ms. Waller said no deadline has been set.         
Some banks don't believe the consolidation of legal entities will make  that much of a difference. Norwest has 41 charters, but other than merging   its 15 Texas charters into one, it has no plans to consolidate.   
Pittsburgh-based PNC Bank Corp. said it has been oerating as one bank  for years and believes it's ahead of other banks. Citicorp took advantage   of another law, merging its non-New York banks into one thrift charter a   couple of years ago.     
Moreover, Fifth Third Bancorp of Cincinnati, one of the most efficient  banks in the country, said it has had no problems with 11 bank charters.   "It's on the list of things to look at, but it's nowhere near the top,"   said spokeswoman Roberta Jennings.