Toll Free: 800-678-7228. Simply sign in to your online Prosper account, click the Loan Details tab, and select Download Payoff Quote.Loan Payoff Request correspondence on SSFCU letterhead. Instructions. Fill out online and submit. I asked them to send us a letter to show that it's been paid off. The rep said they "don't do that" and the'll report it to the agencies in 30-90 days. For mortgages in San Antonio, Jefferson Bank has you covered with conventional, VA and FHA loans, down payment help and first-time homebuyer programs. San Antonio, TX 78246. Security First Credit Union is the largest "homegrown" credit union in the Rio Grande Valley. We pride ourselves on being "from the valley, for the valley."