A local television station reports that a 40-year-old Comstock Park resident later called 911 and confessed.
According to the Kent County sheriff's department, the man simply said: "I'm the one that robbed the bank, and I wanted to turn myself in."
Officials at the sheriff's office said that an armed man walked into a Chase bank in the Grand Rapids area Wednesday morning and demanded money, before getting away with an undisclosed amount of cash.
The 911 call came more than an hour later.
The sheriff's department is working with the FBI on the case.