What is the ruling on opening a current account and an investment account at Samba Bank, knowing that the minimum balance requirement for the investment account is 50,000 riyals, unlike Al-Rajhi Bank which requires 200,000 riyals?

If "Samba" institution abides by Sharia regulations and does not deal in usury, then it is permissible to open a current or investment account with them. However, if it deals in usury, then it is not permissible to open any type of account with them, due to it being cooperation in sin and aggression, and participation in forbidden acts. The questioner is advised to consult the scholars of his country to verify the dealings of this institution.