Michelle Sparrow was working at an RBC branch in Hinton, just east of Jasper, when she swiped the funds between 2001 and 2007.
RCMP say she used a sophisticated scheme that manipulated various accounts under real and fake client names.
Sparrow, who is 42, was recently convicted of two counts of fraud.
In addition to prison time, a judge ordered Sparrow to repay the bank $926,019.
She is no longer with the bank.
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