How did Genoa become wealthy?

Amistad Bank 5 Bank of Cattaraugus 1 BARCLAYS Bank DE 22 Federation Bank 7 Feliciana Bank & Trust 1 First National Bank of Kansas 1 First State Bank of the South 3 FIRST WESTERN Trust Bank 5 Goose River Bank 10 Marquette Farmers State Bank 4 MERCHANTS Bank National Association 4 MISSION Bank 8 NATIONAL CO-OP Bank National Association 10 Nebraska Bank of Commerce 3 Peoples Bank & Trust, Pickett County 3 Pocahontas State Bank 1 Rolette State Bank 2 STEARNS Bank National Association 15 Time Bank 19 Welch State Bank 9