USAA does this. I renentl learned that, when I updated my password a few years back to my personal standard number of characters, everything was good until someone mentioned this fuck-up in a thread. USAA only checks the first... 16? characters. I assume it just discards anything beyond that. Other users say that it warns and doesn't let you enter more than that during password creation, but it/my pw mgr sure didn't care, as I have a password several fold that limit. I took out a couple characters from my 'set' password, and it still logged in just fine. 16, just fine. 15, error.

Fucking wild.