Now that he has built the nation's largest thrift company, Kerry  Killinger, chairman of Washington Mutual Inc., says he is going to take a   break from acquisitions.   
"Our focus now is on internal growth and making sure all the cost  savings will be achieved, which we are very confident will happen.   Everything is moving on target," he said during an interview Wednesday.   
  
Internal growth has never been Mr. Killinger's calling card. His  reputation was built through a series of big acquisitions that resulted in   an eightfold increase in asset size over two years, bringing Washington   Mutual's heft to $158 billion. In the process, it was transformed from a   regional thrift to a major financial services provider on the West Coast.       
But right now, Mr. Killinger has little choice but to slow down his  buying spree. The thrift company's stock is trading at only 12 times next   year's estimated earnings, reflecting investors' worries that Mr. Killinger   may not be able to make his ambitions pay off for shareholders.     
  
These concerns, and the fact that Washington Mutual's stock was being  listed on the New York Stock Exchange, brought Mr. Killinger to New York   Wednesday.   
He arrived as analysts were cutting the company's earnings estimates.  Fourth-quarter results are expected to include hundreds of millions in   charges incurred from Mr. Killinger's latest deal, the acquisition of H.F.   Ahmanson & Co., which closed Oct. 1.     
But Mr. Killinger insisted that the Ahmanson integration is going well  and that Washington Mutual is thriving at a time when a waning global   economy is hurting the earnings of many commercial banks.   
  
As for internal growth, he said he intends to expand Washington Mutual's  consumer finance, mortgage banking, and portfolio lending and even expand   into business lending, the domain of BankAmerica Corp., Wells Fargo & Co.,   and other commercial banks. Expanding existing businesses in Florida and   Texas may not be far off either, he said.       
But until investors see that Mr. Killinger can deliver the 18% returns  on equity they've grown accustomed to, they will not award his stock the   higher multiple that would enable him to do another deal.   
"Momentum-they have got to demonstrate earnings momentum," said Michael  E. Martin, head of the financial institutions group at Credit Suisse First   Boston.   
Mr. Killinger's task to is to build up revenues quickly, a challenge,  considering that most thrifts are currently having a hard time generating   loans.   
  
Though its size enables Washington Mutual to seek loans in a wide  territory, its chief difficulty is that it is the nation's largest   originator of adjustable-rate mortgages, according to Keefe, Bruyette &   Woods Inc. With interest rates at historical lows, consumers prefer fixed-   rate mortgages.       
"Asset mix and rate-risk issues represent the proverbial $64,000  question," said Keefe Bruyette analyst Thomas F. Theurkauf in a recent   report. He rates the stock a "market performer."   
In response, Mr. Killinger said his company would seek to originate more  loans, at either fixed or adjustable rates, by opening new home loan   centers in the coming year and offering direct home loan origination at his   company's California branches.     
He also predicted that a gradual steepening of the yield curve would  make adjustable-rate mortgages more popular in the year ahead. 
Washington Mutual would also like to increase its mortgage banking  business to better compete against Wells and Countrywide Credit Industries,   he added. Such growth, he said, would come down the road via internal   initiatives-or perhaps an acquisition.