Greensburg-based MainSource Financial Group Inc. Chief Credit Officer Bill Goodwin has announced his retirement. The company has selected current Commercial Banking Regional President Chris Bower to succeed Goodwin. Bower has been with MainSource since 2009. Goodwin will help Bower transition into the new role and his last day will be April 30. MainSource has assets of approximately $4 billion and operates 91 offices in Indiana, Illinois, Kentucky and Ohio under the MainSource Bank banner.