Hello everyone,
This suggestion is inspired by the madness that is "offshore banks" and other gimmicks to avoid alliance bank looting. Alliance banks are obviously a very useful tool that we want to include in the game, but we also don't want to end raiding/looting by making their contents invulnerable. That was the inspiration behind the alliance bank looting mechanic (which doesn't often matter due to offshores, etc.)
In the status quo, we have banks like this https://politicsandwar.