In Banking We Trustco. TrustCo Bank Corp is the holding company for Trustco Bank, which operates in eastern New York, central and western Florida, and parts of Vermont, Massachusetts, and New Jersey. It has about 130 branches, offering individual and business customers a variety of deposit products and trust services. It primarily originates residential and commercial mortgages, which account for about three-quarters of its loan portfolio; it also writes business loans and home equity lines of credit. Since 2003, TrustCo Bank has nearly doubled its branch network in New York and Florida by opening new locations. It plans to continue opening new branches, albeit not as rapidly.