TO most bankers, Nationalnobu is a bank of little significance, its capitalization just enough to live on, its presence unknown to many people in the banking industry. But not to Mochtar Riady. Two weeks ago, the founder of the Lippo Group bought the bank which is located on Jalan KH Mochamad Mansyur at Tanah Sereal, a densely populated area near Jembatan Lima in West Jakarta. The purchase marked Mochtar’s return to banking since he lost Bank L