GNB Bank and Insurance is locally owned and serves Marshalltown and surrounding communities. Our financial and insurance specialists offer quality banking investment and insurance services with a focus on friendly personal service. GNB Bank offers online banking Personal Checking and Savings Accounts Business Checking and Savings Accounts Consumer and Ag Loans Mortgage Investment solutions as well as Home and Auto Insurance Crop Insurance Life and Health Insurance and Commercial Insurance options. Visit GNB Bank for all of your financial and insurance needs. Member FDIC; Equal Housing Lender.