It makes no sense that you would have received a 2015 Form 1099-R for the loan shown on the document that you posted, so perhaps this Form 1099-R is for something else. There are no circumstances where a distribution reported on a code 7 2015 Form 1099-R would be repayable over 3 years, so it seems that this Form 1099-R is not directly related to the loan.
If the code 7 2015 Form 1099-R is actually reporting some distribution that you haven't yet mentioned, whether or not it's taxable depends on whether or not you moved the money into another retirement account. If you didn't move the money into another retirement account, the amount shown in box 2a of that Form 1099-R is taxable on your 2015 tax return (unless the 2015 Form 1099-R was issued in error and you can obtain a correction of that form from the payer).
You'll have to ask the financial institution why you received a code 7 2015 Form 1099-R.
