On Friday, after regulators seized troubled Eastern Financial Florida Credit Union, they put Space Coast Credit Union temporarily in charge of operating it. Now Space Coast would like to make the arrangement permanent, offering to merge with Eastern. If regulators approve the merger, possibly by early summer, it could double the size of Space Coast Credit Union. The combined union would be the third-largest in Florida with more than 350,000 members and $3 billion in assets. Eastern Financial has six Tampa Bay area locations: Carrollwood, Town 'N Country, Brandon, St. Petersburg, Oldsmar and Countryside.