Guild bank question

[Madjames]

If I deposit say 10mil gil into the guild bank and later around a month or so decide to quit is the guild required to give the gil back?

What are the GM's stance on this?

What if said FC decides not to give the guild back because it is now the guild leaders decision and he/she says no because it is not the ownership of everyone of the FC so says he, what do I do?

Will the Gm's intervene?

Is there a policy regarding all of the items and gil in the guild bank?

In my opinion anything placed in the guild bank is the sole property of the one with the GM title. I would like clarification. I know in WOW that is the way it is but I would never assume this here.