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Acquisitions (Narrative) (Details) (USD $) | Mar. 31, 2012 | Sep. 30, 2011 | Dec. 16, 2011 Western National Bank [Member] branches | Dec. 31, 2011 South Valley Bank [Member] Offices WesternStates | Apr. 04, 2012 Business Combination [Member] South Valley Bank [Member]
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Business Acquisition [Line Items] |  |  |  |  |
Acquisition from FDIC, deposits assumed |  |  | $ 53,000,000 |  |
Number of branches acquired (in branches) |  |  | 3 |  |
Assets acquired |  |  | 177,000,000 |  |
Loans acquired |  |  | 143,000,000 |  |
Foreclosed real estate acquired |  |  | 7,000,000 |  |
Liabilities assumed |  |  | 153,000,000 |  |
Deposits acquired |  |  | 136,000,000 |  |
Cash received from the FDIC |  |  | 30,000,000 |  |
Number of shares of common stock for each share of acquireee's common stock |  |  |  |  | 0.2962
Common stock consideration from Washington Federal |  |  |  |  | 33,700,000
Maximum contingent cash earn-out payments |  |  |  |  | 39,000,000
Assumed price of common stock |  |  |  |  | $ 16.88
Number of total offices after merger |  |  |  | 190 |
Number of states in which entity operates after merger |  |  |  | 8 |
Total assets after merger | 13,564,108,000 | 13,440,749,000 |  | 14,400,000,000 |
Total deposits after merger |  |  |  | $ 9,600,000,000 |

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