To initiate this process, kindly have the authorized borrower complete and submit a payoff authorization form to our loan servicing department. Fill out your info below and a team member will reach out to you during our business hours, Monday - Friday, am - pm CT.San Antonio, TX 78269-2408. Or Fax to (866) 493-1441. Payoffs must be made via certified funds—wire transfer, money order, or cashier's check. Please do not send personal checks, certified personal checks, or cash. A mortgage payoff letter can come in two forms. One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan. Contact Us. Fill out the form below and a banker will contact you soon. Main Line: (210) 736-7600 ; Jeff Line: (833) JEFF LINE or (833) 533-3546 ; Customer Service: (210) 736-7600 ; Customer Service Hours: Mon - Fri: am - 5pm.