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About Us: Southeastern Bank, established in 1888, has a long history of serving its customers and communities. From checking accounts and loans to investments and more, Southeastern Bank has the financial products you need most. Southeastern Bank has 10 locations throughout coastal Georgia and northeast Florida that include Brunswick, Callahan, Darien, Eulonia, Folkston, Hilliard, Kingsland, Nahunta, Richmond Hill and St. Simons Island.