[troyvit]

I don't know about LineageOS, but there is crowd-sourced list of banks that work with GrapheneOS: https://github.com/PrivSec-dev/banking-apps-compat-report

More info here: https://grapheneos.org/usage#banking-apps

My credit union wasn't on the list, but it works.

[microtonal]

Many do require passing Play Integrity at the basic level and/or having a locked bootloader, etc. In these cases, it works well with GrapheneOS, but not necessarily with LineageOS. If you end up using microG to do it, you just gave Google privileged access to your phone (by microG downloading/using DroidGuard).