May 02-- BankAtlantic, an acquisition target of BB&T Corp., on Tuesday reported a lower loss for the first quarter. BB&T decided March 10 that gaining the No. 6 market share in the Miami market was worth taking on more calculated risk. BB&T would pay $301 million to gain $3.3 billion in deposits and $2.1 billion in loans from BankAtlantic, as well as 78 branches in the...