Bayview Asset Management has finished buying back a large minority stake it sold to Blackstone as the financial crisis was entering its worst phase.Bayview’s management started the buy-back process in March 2015 by repurchasing a 15.3% stake in the Coral Gables, Fla., operation, and continued with annual installments that wrapped up in March.The mortgage-focused Bayview agreed to sell a 46% interest to Blackstone in July 2008 — with...