EXHIBIT 24 Power of Attorney CULLEN/FROST BANKERS, INC. OFFICERS' AND DIRECTORS' POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints T.C. Frost, Robert S. McClane and Phillip D. Green, and each of them, his true and lawful attorneys-in-fact and agents, and with power of substitution and resubstitution, for him and in his name, place and stead, and in any and all capacities, to sign the Annual Report on Form 10-K of Cullen/Frost Bankers, Inc. for the fiscal year ended December 31, 1993, to sign any and all amendments thereto, and to file such Annual Report and amendments, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite or necessary to be done in and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or either of them, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Signatures Title Date - -------------------------- ------------------------ ---------------- Chairman of the Board and Director (Principal) /s/ T.C. FROST Executive Officer) February 1, 1994 - -------------------------- ---------------- (T.C. Frost) President and /s/ ROBERT S. McCLANE Director February 1, 1994 - -------------------------- ---------------- (Robert S. McClane /s/ ISAAC ARNOLD, JR. Director February 1, 1994 - -------------------------- ---------------- (Isaac Arnold, Jr.) /s/ HENRY E. CATTO Director February 1, 1994 - -------------------------- ---------------- (Henry E. Catto) /s/ HARRY H. CULLEN Director February 1, 1994 - -------------------------- ---------------- (Harry H. Cullen) /s/ ROY H. CULLEN Director February 1, 1994 - -------------------------- ---------------- (Roy H. Cullen) /s/ RICHARD W. EVANS, JR. Director February 1, 1994 - -------------------------- ---------------- (Richard W. Evans, Jr.) /s/ W. N. FINNEGAN, III Director February 1, 1994 - -------------------------- ---------------- (W. N. Finnegan, III) /s/ JOSEPH H. FROST Director February 1, 1994 - -------------------------- ---------------- (Joseph H. Frost) /s/ JAMES W. GORMAN, JR. Director February 1, 1994 - -------------------------- ---------------- (James W. Gorman, Jr.) /s/ JAMES L.HAYNE Director February 1, 1994 - -------------------------- ---------------- (James L. Hayne) /s/ HARRIS L. KEMPNER, JR. Director February 1, 1994 - -------------------------- ---------------- (Harris L. Kempner, Jr.) /s/ RICHARD M. KLEBERG, III Director February 1, 1994 - -------------------------- ---------------- (Richard M. Kleberg, III) Signatures Title Date - -------------------------- ------------------------ ---------------- /s/ QUINCY LEE Director February 1, 1994 - -------------------------- ---------------- (Quincy Lee) /s/ J. GORDON MUIR, JR. Director February 1, 1994 - -------------------------- ---------------- (J. Gordon Muir, Jr.) /s/ W.B. OSBORN, JR. Director February 1, 1994 - -------------------------- ---------------- (W.B. Osborn, Jr.) /s/ ROBERT G. POPE Director February 1, 1994 - -------------------------- ---------------- (Robert G. Pope) /s/ HERMAN RICHTER Director February 1, 1994 - -------------------------- ---------------- (Herman Richter) /s/ A. FRANK SMITH, JR. Director February 1, 1994 - -------------------------- ---------------- (A. Frank Smith, Jr.) /s/ CURTIS VAUGHAN, JR. Director February 1, 1994 - -------------------------- ---------------- (Curtis Vaughan, Jr.) Executive Vice President and /s/ PHILLIP D. GREEN Treasurer February 1, 1994 - -------------------------- ---------------- (Phillip D. Green)