Del. Code tit. 5, § 1621

Three or more persons of lawful age, at least 2 of whom must be citizens of this State, who associate themselves by a written agreement, hereinafter called “articles of association,” for the purpose of forming a savings bank may, upon compliance with this chapter, become a corporation, with the powers conferred by this chapter and subject to the regulations prescribed by this chapter and subject also to the regulations prescribed for banks and trust companies by any general statute of this State.