Some of the most reckless bankers of the past decade are now becoming active philanthropists, the Wall Street Journal reported Monday. If you've been wondering where former Bank of America (NYSE: BAC) CEO Ken Lewis or Countrywide CEO Angelo Mazilo have been in recent years, you're not alone. The two executives and many of their peers who took aggressive risks and lost billions during the historic credit crisis have been largely out of sight. Today we learn that Ken Lewis has donated "several hundred…