WASHINGTON - The first "virtual" bank has gotten regulators go-ahead,  with a few conditions. 
The Office of Thrift Supervision this week approved plans by Cardinal  Bancshares of Lexington, Ky., to remake a subsidiary in rural Pineville,   Ky., into an on-line bank serving customers nationwide on the Internet.   
  
But before Security First Network Bank can make the jump to cyberspace,  the thrift agency is requiring it to pay for independent tests of the   security systems it will use to keep hackers (and employees) from tampering   with customer accounts.     
Security First also will be subjected to slightly more Community  Reinvestment Act scrutiny than is customary. The agency is demanding that   the bank report back in six months on its lending to low- and moderate-   income applicants and spell out at that time exactly which community it is   serving.       
  
James S. "Chip" Mahan 3d, Cardinal's chairman and chief executive  officer, said the Office of Thrift Supervision's conditions are reasonable   - especially considering the wariness with which the agency first   approached Cardinal's proposal.     
"We started with the OTS last September and met with some concern on  their part," Mr. Mahan said. "I would say that for at least the first 90   days it was an education process: What is the Internet? What are the   security concerns?"     
A turning point came when Mr. Mahan made a presentation to thrift  regulators using Quicken, the popular home finance computer program, as an   example of what his bank was aiming to do. It turned out that John Downey,   the agency's director of supervision, was a Quicken user, Mr. Mahan said,   and everything went more smoothly after that.       
  
Intuit, the maker of Quicken, already offers some on-line banking  services, as do software-giant Microsoft and several banks. As many as 30   banks also offer information about their services on the Internet, the   wide-open worldwide computer network whose commercial possibilities are   just starting to be explored.       
Security First is unique in that it plans to do most of its business on-  line, and will use the Internet for actual checking account transactions,   not just information.   
Mr. Mahan said the bank probably didn't need regulators' approval to  start offering services over the Internet. "Any bank or thrift in the   country could effectively put a product on the Internet if they wanted to,"   he said. "But we didn't want the OTS to suddenly come and say, Why don't   you stop doing this until we figure out what the Internet is?"       
The computer security system that the thrift agency wants tested is  devised by Secureware Inc., an Atlanta data security firm that has done   most of its past business with the Pentagon and other government agencies.   If it passes the tests, the company hopes to market the system to other   banks, said Michael McChesney, Secureware's chief executive and Mr. Mahan's   brother-in-law.         
  
Internet banking is uncharted territory for the CRA, which requires  banks to delineate a service area and show that their lending practices   adequately serve it.   
But with Security First planning to make checking accounts the focus of  its Internet operations and restrict its lending chiefly to the rural   southeastern Kentucky county where it will maintain its lone brick-and-   mortar branch, Mr. Mahan said he doesn't expect the reinvestment law to be   much of an issue.