Yes, blockchain can be helpful for the banks in many ways:
1. The investment banks spend a huge amount on settlement and clearing jobs which can be saved with blockchain technology.
2. By shifting their payments system on blockchain technology banks can reduce the cost involved in processing them by eliminating middlemen. This would offer high security too.
3. With blockchain technology banks can access the individual verification of other organizations clients, which can save the amount spend on fulfilling KYC norms.