Western Financial Savings Bank, the California thrift that broke out  its profitable auto-lending operations into a separate subsidiary earlier   this year, is preparing to sell a significant stake to the public.   
The subsidiary, WFS Financial Inc., filed a registration statement with  the Securities and Exchange Commission laying out plans to sell 3.8 million   shares at $12 to $14 each.   
  
The sale, which could raise as much as $53.55 million for WFS, will make  the subsidiary 16.9% publicly owned, with the remainder held by Western   Financial. Western Financial is a subsidiary of Westcorp, based in Irvine,   with $2.9 billion of assets.     
Westcorp officials declined to comment because the offering is still in  registration. 
  
Since 1990, originating auto loans for securitization and sale has been  an increasing part of Westcorp's business. 
Total serviced assets, including $1.8 billion of automobile and light-  duty truck loans, were $5.9 billion on March 31. 
Westcorp's originations of automobile and light-truck loans increased  18%, to $337 million, in the first quarter from the year-earlier period. 
  
The boost in automobile loan originations was attributable to increased  volumes in California as well as to continued expansion of origination   activities in eight other Western states.   
In April, Western Financial moved all its auto financing operations into  its WFS subsidiary, making the thrift primarily a mortgage bank. WFS has 73   automobile lending offices in nine states, including 41 in California and   16 in Texas.