Dentarg Dies

Q u o t e:
Is there a way to transfer an entire guild and guild bank?

Guild, possibly, though not guaranteed. Guild bank, no.

You may wish to discuss the details with your guild to make a decision as to which realm you all want to move to:

Q u o t e:
http://forums.worldofwarcraft.com/thread.html?topicId=26726065190&sid=1

The following are the destination realms for Free Character Moves off of Dentarg:
• Alterac Mountains (Horde Only) of the Nightfall battlegroup is an Eastern time zone realm - http://forums.worldofwarcraft.com/board.html?sid=1&forumId=68891
• Archimonde (Alliance Only) of the Stormstrike battlegroup is a Central time zone realm - http://forums.worldofwarcraft.com/board.html?sid=1&forumId=11139
• Zuluhed (Both Factions) of the Stormstrike battlegroup is an Eastern time zone realm - http://forums.worldofwarcraft.com/board.html?sid=1&forumId=11453

Good luck!

Q u o t e:
I will obviously discuss the decision with my guild.

Asssuming we all agree to transfer to a specific server, how do we proceed?

To being the transfer process, log into Battle.net Account Management and select “Free Character Migration”.

You and your guildmates may wish to review the Free Character Move FAQ for all the details before making a final commitment:

http://us.blizzard.com/support/article/FCMFAQ