Legal question concerning security deposit

[Joseph Ret]

I have a ex tenant who was month to month and violated their lease agreement by damaging the house, not paying rent and water Bill's. They have moved out but they have come back two months later asking for their entire security deposit to them because I did not give them in writing their itemized damages for their security deposit. Unfortunately, I did not give that to them but did tell them I am keeping the deposit. So do I have any legal leg to stand on or am I liable to give them their security deposit back. I live in Maryland if that helps.