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Subsequent Events	9 Months Ended
	Jun. 30, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Conversion to national charter - Effective July 17, 2013, Washington Federal completed its conversion to a national bank charter with the Office of the Comptroller of the Currency (the "OCC") and is now a national bank. The Company also completed its conversion to a bank holding company with the Federal Reserve. Branch acquisition - Effective July 18, 2013, Washington Federal, the wholly owned subsidiary of the Company, entered into a series of related Purchase and Assumption Agreements for the acquisition of deposits totaling approximately $1.8 billion, loans totaling approximately $11 million, and related assets, from Bank of America, National Association, for an aggregate purchase price of 2.6% of the average daily closing deposits, which is estimated to be $45.6 million. These acquisitions represent a total of 51 branches located in Eastern Washington, Idaho, Oregon and New Mexico. Subject to regulatory approval from the OCC and the satisfaction of customary closing conditions, the transaction is expected to close in the fourth calendar quarter 2013.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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