What do you mean by primary bank?

Bank of Grandin 5 Bank of Madison 7 BANK OF MARIN 6 CenBank 13 Commonwealth National Bank 12 Farmers & Miners Bank 5 FIRST S Bank 2 First Security Bank, NV 6 First United National Bank 3 GENOA BankG CO 9 Independent Correspondent Bank 13 Lamar National Bank 5 Neffs National Bank 8 RELYANCE Bank 11 STAR FNCL Bank 14 Touchmark National Bank 2 United Farmers State Bank 1 United Midwest Savings Bank, National Association 5 Unity Bank of Mississippi 10 Zenith Bank & Trust 29