EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement No. 333-111029 on Form S-8 of Kaiser Federal Bank, of our report dated April 11, 2008, appearing in this Annual Report on Form 11-K of the Kaiser Federal Bank Employees' Savings and Profit Sharing Plan for the year ended June 30, 2007. /s/ Crowe Chizek and Company LLP -------------------------------- Crowe Chizek and Company LLP Oak Brook, Illinois April 11, 2008