The regulatory compliance burden, cyber security risk and other issues remain key concerns among the leaders in the banking industry, a new survey reveals. Bank Director and Grant Thornton LLP conducted the survey of more than 130 senior executives and directors of U.S. banks with more than $500 million in assets by email in June. The regulatory compliance burden remains the top overall concern of bankers with 87 percent of large banks and 86 percent of smaller banks - with less than $10 billion…