How much money is safe to have in a checking account?

Banner Capital Bank 5 Cendera Bank 18 COMMUNITY National Association National Bank 7 CREWS B&TC 7 DALLAS CAP Bank National Association 1 DEUTSCHE Bank TC AMERICAS 21 EAGLEMARK SVG Bank 23 FIRST INTERNET Bank IN 13 First Iowa State Bank 8 FIRST TX Bank 6 Horatio State Bank 5 MAINSTREET Community Bank OF FLORIDA 4 MinnStar Bank, National Association 4 Murphy Bank 11 POPPY Bank 17 R Bank 8 RESOURCE Bank National Association 2 Settlers Bank 13 SOVEREIGN Bank 11 State Bank of Wynnewood 3