This is way more difficult than it should be, but I figured out how to invite my horde toons to my alliance bank guild.
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Create a cross-faction Community and have all your other faction toons join it. It’s a bit of a pain because you have to log in and out of the toons to apply, be accepted, etc. Make sure the toon who creates the Community is either your Guild Leader or has permission to invite members to the guild.
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Have the toon that created the cross faction community (“Owner”) post a link in the COMMUNITY chat for the guild. To do this:
2a. make sure your community channel is open in your chat box
2b. click the Invite Member box in your Guild pane (not in the Community pane)
2c. click the “link post in chat” button. this should now put a link in your community chat. Mine was in yellow and it said [Guild: Guild Name Here].
Edit: we think your guild needs to be listed in the guild finder in order to see the “link post in chat” button needed for this step. (Thanks to Pharazon for sharing this tip)
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Now, long back into your other faction toons that joined your new community, go to the Community chat pane and you can click on the link to join your guild.
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Then there will be some hopping back in forth between toons to approve the request to join the guild, promote to ranks, etc.
Good Luck! Hopefully they will make this process easier because this is ridiculous.
Edit: some problems people are having because I forgot to mention some tips in my original post. (Sorry!)
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When you create your Community, make sure you check off the “Cross-Faction” box in the middle of the screen so the other side can see and join.
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When you are searching for the Community you made, make sure you go to the “Filter” drop down menu at the top left and check off “cross-faction” otherwise your Community won’t show up when you search for it.