How Do Big Banks Allocate Deposits In The Internet Era To Branches?

This is a general questions about how the banking system works.  Back in the day before internet banking it was clear that your account was tied to a specific branch and that branch usually appeared on your printed checks.

On the FDIC website there is a database called Summary of deposits which lists how much deposits each individual branch has.  With a big bank like Wells Fargo for example, how do they determine this?  What if an account is opened online?  What if you move states?  I opened an account at a local branch but when my checks came, they did not make any reference to a specific branch.  Where are my funds allocated?

Does my question make sense?  Any speficic reference to a source that explains this?  TIA