If the loan is not due, it will not have any impact on your deposits at the credit union. If the loan matures, the credit union will require you to withdraw your deposit to repay the loan. Failure to repay will, firstly, affect your personal credit report and have a negative impact on your future loans from any bank. At the least, the loan interest rate will be higher than that of borrowers with the same conditions, and at worst, the bank will refuse the loan. Second, the credit union may file a lawsuit in court to force the loan principal and interest to be recovered.