Wis. Stat. § 221.0305

A bank may purchase and hold, for the purpose of becoming a member of the federal reserve bank, so much of the capital stock of the federal reserve bank as will qualify it for membership under 12 USC 321 to 339 in the federal reserve bank. The bank may become a member of the federal reserve bank, and may have and exercise all powers, not in conflict with the laws of this state, that are conferred upon a member bank. The member bank and its directors, officers and shareholders remain subject to all liabilities and duties imposed upon them by the laws of this state.