Wis. Stat. § 221.0803

If the board of directors or a quorum thereof or any committee of the board of any bank knowingly violates or knowingly permits any of the officers, agents or employees of the bank to violate this chapter, the directors are jointly and severally liable for the amount of the loss sustained by the bank. If, after a warning from the division, the directors shall fail to make good any loss or damage resulting from the violations, or continue such conduct, it shall constitute a ground for the forfeiture of the charter of the bank, and the division shall institute proceedings to enforce the forfeiture and to secure a dissolution and a winding up of the affairs of the bank.