My bank password is case insensitive. It could be they are lower casing it before they hash it or they could be storing it in plain text. Judging by the mess they make of their systems I would say it's the later.
my gf can omit last x chars for hers and it's still accepted, can't recall what x was. Banks are so funny
For a while (maybe pre-2015?) Charles Schwab had users append the 6 character 2FA code to the end of your password (which itself was limited to between 6 and 8 chars), so they were either splitting it client side or storing everything in plaintext...