Why does Enterprise hold $300 dollars?

ADP Trust Company, National Association 27 Bank of Little Rock 12 BANKIOWA 5 Battle Creek State Bank 8 Cedarstone Bank 2 Citizens Bank of Minnesota 8 Credit First, National Association 14 DUNDEE Bank 14 Farmers & Merchants National Bank 1 First National Bank of Groton 1 First National Bank of Proctor 1 FIRST UNITED B&TR 8 Metz Banking Company 4 Mid-America Bank 4 National Grand Bank of Marblehead 4 Signature Bank of Georgia 4 SOUTHWESTERN National Association National Bank 7 State Bank of Chandler 4 State Savings Bank 9 Texas Traditions Bank 5