Is it permissible to transfer one's salary to a usurious bank in order to save on service charges, knowing that the account will be a current account without interest, that the amount will be regularly transferred to an Islamic bank, and that the questioner avoids using a credit card without sufficient coverage, and has doubts about the dealings of the current Islamic bank?

It is impermissible to open an account in a usurious bank when Islamic banks and legitimate alternatives are available, even if the service fees are higher or the banking services are better. As for the commission on cash withdrawals, its ruling can be reviewed. Direct loans from the bank involve details: if it is with interest, it is usury (riba); if it is a legitimate financing transaction, there is no harm in it. If an Islamic bank has a questionable transaction, it is permissible to avoid it and deal with them in transactions that are free from doubt.