Hi, not discouraging anyone from addressing your specific questions, but there have been several threads on banking in Ancient Rome that you may find interesting

• /u/peripatos introduces the concept of "banks" in What are the earliest banks we know about?. The discussion continues w/ /u/Tiako in Were there banks in ancient Rome?

• Did ancient civilizations have banks? When did ideas like loans with interest come about? featuring /u/PlinytheHipster

Where did Romans store their wealth?

• In Ancient Rome, where did the wealthy keep their...wealth? Gold? Money? featuring /u/rkiga

• If there were no true banks in the ancient world (eg. Rome), where did the richest guys like Pompey and Crassus store their immense wealth?

• Roman historians: Where did Marcus Licinius Crassus keep his immense fortunes?

• How did Roman senators/businessmen actually store and secure their wealth? How much was liquid, how much was tied up in assets?