LONDON (Reuters) - Oil trader IMMS has taken Lebanese bank BankMed to court in the U.S. state of New York accusing it this month of failing to return $1 billion of its deposits when requested, according to court documents seen by Reuters.BankMed did not respond immediately to a request for comment.IMMS Chief Executive Murtaza Lakhani, who trades European, Middle Eastern and Asian oil and oil products, said he would not comment beyond the case, filed with the Supreme Court of the State of New..