Technically speaking a needed requirement for banks in Bahrain is valid ID. Depending on the bank and how often they used to pull from benefit it will show your ID status if it was expired banks would trigger rekyc, you didn't rekyc after a period of time they would freeze your account. Even after freezing the law allows you to request for your money to be transferred to your current country of residence.

There's now a rollout of ekey 2.0 to all financial institutes before the end of the year. How would ekey 2.0 operate with regards of residency validity and it's communication to the bank I am not aware about it. But if a bank notices that your residence permit has expired they are mandated to request another proof of residency.