California Code, Financial Code - FIN § 14807

(a) A member may withdraw from membership in the credit union at any time.  A withdrawing member may be required to give 60 days' notice of intention to withdraw shares and 30 days' notice of intention to withdraw certificates for funds, except when a different period of notice is required by the commissioner for the withdrawal of shares or share certificates that may be established by the board of directors.

(b) A member who fails to take steps necessary to be removed from inactive status pursuant to Section 14811 may be deemed to have voluntarily withdrawn from credit union membership.

(c) A member whose funds have been remitted to the Controller's office for purposes of escheat consistent with Section 1513 of the Code of Civil Procedure shall be deemed to have voluntarily withdrawn from membership.