Ive recently been doing some light-learning about the pre-Caesar and rise-of-Caesar time frames within Roman history and have been stumbling upon alot of discussion about bribery, wealth accumilation through foreign conquest, and tax collection. Additionally there seems to be no mention of any sort of official banking system as well as the obvious, no form of elecronic or "paper" representations of wealth.

I am curious how individuals such as Crassus (or even the official treasury as well) maintained, stored, and transferred their wealth around the Republic. Did they maintain their own sorts of private quasi-banks and vaults to hold their vast physical wealth?

Thank You in advance