Investigators say 48 year old Maria Estelle Martin took the cash from vaults and kept it instead of putting it in the ATMs.
She pleaded guilty to embezzling cash from a credit institution in September.
According to court documents, Martin spent most of the money at casinos, putting up to $70,000 into single slot machines.
In addition to the 33 month sentence, Martin will be on 5 years of supervised release after serving the time and must repay almost $850,000 of the stolen money.
She faced a maximum 30 year sentence and a $1 million fine.
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