NEW YORK (Reuters) - The chief executive of the failed savings and loan Washington Mutual Inc (WM.N: Quote, Profile, Research, Stock Buzz) could get $13.65 million for the 18 days he was on the job, a regulatory filing shows. Alan Fishman was awarded a $7.5 million signing bonus when he joined the Seattle-based thrift on Sept 7, according to a U.S. Securities and Exchange Commission filing. His employment agreement also provided for a $6.15 million lump sum payment as severance if he were terminated without cause, the filing shows. Washington Mutual hired the former chief executive of Brooklyn, New York-based Independence Community Bank Corp to help the thrift rebound from soaring mortgage losses. That plan was dera » original news ...