Guaranty Bank acquires Bank of Maringouin Guaranty Bank acquires Bank of Maringouin Advocate staff report May 10, 2014 Comments The holding company of New Roads-based Guaranty Bank and Trust Co. will acquire the holding company of Bank of Maringouin under a deal announced Friday. Terms of the agreement between Great Guaranty Bancshares Inc. and Banque of Maringouin Holding Co. were not disclosed. Guaranty Bank has locations in New Roads, Livonia, Port Allen and Zachary. The bank, founded in 1956, has $141 million in assets and 45 employees. Bank of Maringouin has locations in Maringouin and Grosse Tete. Founded in 1903, Bank of Maringouin has $55 million in assets and 14 employees.