Cass Commercial Bank has appointed Dwight D. Erdbuegger the new president of the bank.

Erdbuegger succeeds Robert J. Mathias who will assume responsibilities as vice chairman of the board. Mathias, 65, has been president of Cass Bank since 2008. The bank has thrived under his leadership, consistently ranking among the top-performing banks in the country.

Cass Bank is the commercial banking subsidiary of Cass Information Systems, Inc., a leading national provider of transportation, energy, telecom and waste invoice payment and information services.

Erdbruegger, 59, joins Cass after a 31-year career in commercial banking, the last 15 years spent with Commerce Bank. Most recently he was chairman of CBIEF, the equipment finance subsidiary of Commerce. He was also chief administrative officer for Commerce Bank East Group, with offices in Missouri, Indiana, Michigan, Ohio and Tennessee.

Erdbruegger has previously served on the board of directors of FOCUS St. Louis and the Cultural Festivals Organization. He has also been involved with Habitat for Humanity.

Erdbruegger earned his Bachelor of Science in Industrial Engineering from Purdue University and a Master of Business Administration from Southern Methodist University.