Texas Bank and Trust Company of Dallas - Season's Greetings
Main at Lamar - RIverside 8-9141 - The Largest State Bank in Texas
I found Texas Bank & Trust mentioned as early as 1930 and as late as 1965. This illustration looks like an atomic-age incarnation of the Texas Bank Building, or at least of its parking garage, and the phone number looks like it came from the late 50s or early 60s. "The Downtown Bank" was located on the corner of Main and Lamar, and peering at a street view in google maps, I'm guessing its building is long gone. One corner of that intersection is home to El Centro College, in the old Sanger Harris Building, and the Texas Club, built upon the metal frame of the former Continental Trailways Bus Terminal occupies a second corner. The Texas Bank Building must have been on one of the two other corners, either the one containing a skyscraper of fairly recent vintage, or the corner that's a ground-level parking lot.
But back to the subject of "Christmas" greetings, again no sign of the word on this matchbook, although I do see what looks like a church in the snowy scene above.