Yup, assign certain fleet bank privelages according to rank. Promote those that you feel you can trust. It's worked well for Federation Fleet so far with over 350 members. We haven't had a fleet bank theft since beta (which was ultimately pointless anyway)
There are some yes, but the best way is to keep and eye on your fleet bank logs.
You can set premissions in each tab of your fleet bank where you can limit how many credits and items can be despoited and withdrawn. The button for the premissions is at the bottom right of the fleet bank tabs. Also make sure you don't give right to change those fleet bank premissions to other members outside of the one you trust. The only people that should have the rights to change the fleet bank premissions is the Fleet Leader and his most trusted members, don't ever give those rights to anyone out side of your council.
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You can set premissions in each tab of your fleet bank where you can limit how many credits and items can be despoited and withdrawn. The button for the premissions is at the bottom right of the fleet bank tabs. Also make sure you don't give right to change those fleet bank premissions to other members outside of the one you trust. The only people that should have the rights to change the fleet bank premissions is the Fleet Leader and his most trusted members, don't ever give those rights to anyone out side of your council.