How much money is too much to keep in a checking account?

Adams State Bank 6 Anna-Jonesboro National Bank 13 BLACKROCK INSTITUTIONAL TC National Association 27 COMMERCIAL Bank OF CALIFORNIA 12 Connection Bank 12 First National Bank of Fletcher 4 First National Bank of Sparta 4 First Security Bank of Roundup 4 Garden Plain State Bank 6 Home National Bank 5 Home Savings Bank 3 Home State Bank 7 Malvern Bank 2 Marseilles Bank 4 Mountain Valley Bank, National Association 2 NORTH SIDE B&TC 1 Sainte Marie State Bank 7 Southeast First National Bank 4 Three Rivers Bank of Montana 6 wells fargo credit card 29