Police and CrimeStoppers are looking for a man who robbed the Bank of Hawaii Waipahu branch Wednesday.  Police say the suspect entered the bank on Farrington Highway just after 12 p.m. approached a teller and demanded money.  He fled on foot with an undetermined amount of cash.  The suspect is described as in his 60s, about 5'6" to 5'7"tall, weighing 140-to 160-pounds.  He has white hair, a white goatee and was wearing a white T-shirt, with a black and white patterned hat. He was carrying a black backpack.