A parolee was arrested Thursday after robbing three banks -- each time wearing the same Toronto Blue Jays baseball cap, Nassau police and state parole officials said.

Robert Davidson, 56, of Uniondale, is expected to be arraigned Friday on three counts of third-degree robbery and violation of parole.

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Detectives had been looking for the serial robber since he hit the TD Bank on Merrick Road in Rockville Centre on Jan. 10, followed by the Capital One branch on Merrick Road in Merrick on the morning of Jan. 13, then the TD Bank on Franklin Avenue in Garden City in the afternoon that same day, police said.

Each time, the robber handed a teller a note demanding cash, police said, and detectives released bank surveillance images of the suspect with the Toronto Blue Jays cap.

No weapon was seen in the robberies. But police said that in at least one instance the suspect stated in his note that he was armed with a gun.

Davidson was arrested at his home on 1030 Arthur Ave., police said.

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State records show Davidson has served prison time for a string of robberies and was paroled in December 2012.