Fortress Bank provides the community with sound financial solutions for business and personal use from our nine banking centers in Illinois and Iowa. We would love to help you manage and grow your vision.If you are interested in learning how, please fill out this form and we'll be in touch! You have the option of setting your loan payments up on ACH or "auto-pay" where we will deduct the payment amount on the requested date from your bank account. Fortress Bank - Enter Your Information. Please enter your loan account number. 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. In 2005, fresh out of national service, Dallas hit rock bottom. Advances from the Federal Home Loan Banks of Dallas, the Federal Reserve Bank Discount Window and other borrowings.