I think banks will only work from guild to guild.
Loaning out big amounts as well as trusting the person to give it back doesn't seem like a good idea at this place in time, and would be best done withing guilds.
You cannot force people to pay the money bank, and you also cannot know how much each person can afford to pay back, some people can pay back 100k at a time, others 3k, and me about 30k maybe 50k per week.
Again, it all depends on who your customers are, and i feel that banks will have alot of trouble getting off the ground and not getting ripped off.
The only people i think who can truly start a bank are Tipore and Gharin, and a few others, they can afford to lose the money lol

~~Datruth