Obviously if your bank asks you to "verify" yourself after they've called you, it is 99% chance of being a scam and you just tell them you're going to call back and if they get desperate sounding it is 100% a scam.
It immediately eliminates anyone not thinking to spoof-call GPs small credit union. Given that most of the scammy calls I receive are about accounts with places that I don't have accounts, I don't think that level of targeting is the norm.