BOYERTOWN, Pa., June 24 /PRNewswire-FirstCall/ -- National Penn Bancshares, Inc. (Nasdaq: NPBC ), the parent company of National Penn Bank and Christiana Bank & Trust Company (Christiana), announced today that it has signed a definitive agreement under which WSFS Financial Corporation (Nasdaq: WSFS ) would acquire the stock of Christiana for a cash purchase price of $34.5 million. The transaction, anticipated to close in the fourth quarter of 2010, is subject to regulatory approval. The sale includes the trust asset administration business, with annual revenue of approximately $6.5 million, and two commercial bank branches located in Delaware. The transaction will result in an approximately $8 million goodwill impairment charge related to the trust asset administration business, specifically at Christiana, in the second quarter 2010.