(a) On written notice to the corporation's board of directors, a member may withdraw from a corporation on the date stated in the notice. The date of a member's withdrawal must be at least six months after the date notice is given under this subsection.
(b) A member is not obligated to make a loan to the corporation pursuant to a call made after the date of the member's withdrawal from the corporation, but a member shall fulfill any obligation that has accrued or for which a commitment has been made before the withdrawal date.