Who pays for the assessment on a bank-owned condo unit?

Our HOA is having a special assessment which is $150.00 a month for 6 months. Out of 81 units I know two that are bank-owned, one has a default notice on the door. If these units do not pay the assessment, is it absorbed by the other members in the HOA community? Is there a way to tell how many units are in default or not paying dues. I would like to know what this assessment will really cost me. Thanks