It's a similar case you were asking if they refused you because of your previous academic credentials - I doubt they'd bring up HOW you got the loan, when you were already approved for one. It is the banks business how you were able to get the loan, not exactly the immigration office. Unless they wanted a police background check on you for some reason.
I'll give you my own case, it may help ease your mind:
I was inside Canada on an extended visitor visa and I live with my Canadian fiance on this (I am from the UK). I applied for a student loan through a bank inside Canada, but was only allowed to do so with a Canadian guarantor - who was my fiance. I was accepted for the loan. I applied online through CIC, showed proof of my loan (the contract signed by the bank and myself, which showed the funds I was granted). For extra proof of financial support, under the Letter of Explanation section I wrote and signed a letter explaining my fiance is supporting me with a home and food until I am legally allowed to study/work and said if they needed proof of his wage they can ask and we will provide upon request. I also got my fiance to write a short letter (with signature) confirming our personal relationship and living arrangement. At that point we did not provide anything else (besides my university acceptance letter and the application form and passport documents etc), and I was accepted.
Really, at the first point of applying you just need to supply what is asked for on the application. Read it carefully, and if you feel anything differs in your own personal case somehow, just explain it on an additional document. If they want anything else, they SHOULD contact you and ask. You may be unlucky and get declined straight away if anything is out of place, but my own application was "different" yet I was accepted with no complication.
