Mother lives in an Alzheimer's facility and I'm her POA. The bank asked for her signature on her account, but she is unable to speak or sign. Is her mark sufficient?

You need to take the ORIGINAL Power of Attorney that you had notarized to the bank, and YOU sign. That is what it's for. YOU have become her representative in legal matters. If you need more info, Google your question, or call an attorney. Good Luck.

I took the document giving me POA to the bank and they have a copy of it on record. Now when making transactions for Mom, I sign her name and POA with my signature below and that takes care of it. I hear some states are different. I would ask an officer at her bank what they require. Best Wishes.

It all depends on the bank. My parent's bank with BANK OF AMERICA and you won't beleive the crap they've put us through just to add my name onto their checking account and I have full POA to include banking. I've dealt with their headquarters and all the idiots seem to go round and round but still come back with the same red tape answer. I'm just trying to pay the bills folks!