How does an LNB work?

21ST CENTURY Bank 7 Bank of Holly Springs 8 BankSouth 5 Bluff View Bank 5 Buckeye State Bank 10 CATHAY Bank 21 Dozier Bank 4 First Iowa State Bank 8 First National Bank of Cokato 3 FIRST S State Bank 1 First Security Bank West 3 Goppert State Service Bank 9 INTERNATIONAL FNC Bank 12 LAKE CITY Bank 9 Lincoln National Bank of Hodgenville 10 Pathway Bank 17 State National Bank 14 STEARNS Bank National Association 15 UNITED VALLEY Bank 3 Varo Bank, National Association 19