The principle of balance of convenience in legal parlance is like this.
1. If the bank does not give you appointment, as you have rightly said, your career would ruined even if later you were discharges from all criminal cases. The loss to you will be great.
2. On the other hand if the bank employs you now and later the court pronounces you guilty the bank will discharge from service. But the loss to the bank will be small as it will only losing one employee among thousands of employees.
Thus in fairness to you the bank should employ you first and then watch what happens to your case later.
I am not a lawyer. But I am myself retired from Government Service and have seen such things. Go ahead. You will win.