The theft took place in the intervening night of February 1-2 and the arrests were made on Monday, an official said.
The thieves entered the bank through a toilet window and went about the crime after the main accused, identified as Kashinath Vasant Pendharkar, switched off electricity supply, leading to CCTV cameras there going blank, he said.
A police complaint was lodged the next morning by the bank's branch manager after the theft came to light, he added.
Probe into the case included surveilling several people with past records of theft to find out about criminals with a similar modus operandi, he said.
"We soon zeroed in on Pendharkar, a resident of Navi Mumbai, who was picked up Monday night from Wadala . His questioning led to the recovery of Rs 15,000. He revealed the names of three of his aides in the crime," he said.
"Of the three, Chetan Ghaitadke and Aniket Singh have been arrested while Prasanna Bandre fled with the remaining of the loot," the official said.
A case has been registered under sections 454 (house breaking), 457 (house breaking by night) and 380 (committing theft in any building) of the Indian Penal Code, he said.
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