(1)    When permitted. Unless the articles of incorporation or bylaws provide otherwise, action required or permitted under this chapter to be taken at a board of directors’ meeting may be taken without a meeting if the action is taken by all members of the board. The action shall be evidenced by one or more written consents describing the action taken, signed by each director and retained by the bank.

   (2)   Effective date. Action taken under this section is effective when the last director signs the consent, unless the consent specifies a different effective date.

   (3)   Effect of action. A written consent signed under this section has the effect of a unanimous vote taken at a meeting at which all directors were present, and may be described as such in any document.