Gardiner Savings Institution has four locations in Augusta, and nine other locations in surrounding towns. They are opened late on Thurs. and Fri. this includes their drive-up teller's window, and opened at some locations on Sat. They have drive-thru ATM's at most of their locations for you to do make deposits, withdrawals or check on your account balance.
I find their hours of business are opened later than most banks in the area.