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Acquisitions (Narrative) (Details) (USD $) |  |  |  |  |  |  |  | 3 Months Ended
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Jun. 30, 2012 | Dec. 16, 2011 | Sep. 30, 2011 | Dec. 16, 2011 Western National Bank [Member] branches | Jun. 28, 2012 South Valley Bank [Member] | Apr. 04, 2012 South Valley Bank [Member] | Dec. 31, 2011 South Valley Bank [Member] WesternStates Offices | Jun. 30, 2012 Acquired Loans [Member] Western National Bank [Member] | Jun. 30, 2012 Real Estate Held for Sale [Member] Western National Bank [Member] | Jun. 30, 2012 Other Assets [Member] Western National Bank [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition from FDIC, deposits assumed |  |  |  | $ 53,000,000 |  |  |  |  |  |
Number of branches acquired (in branches) |  |  |  | 3 |  |  |  |  |  |
Assets acquired |  | 124,594,000 |  | 177,000,000 |  |  |  |  |  |
Loans acquired |  |  |  | 143,000,000 |  |  |  |  |  |
Foreclosed real estate acquired |  |  |  | 7,000,000 |  |  |  |  |  |
Liabilities assumed |  | 154,493,000 |  | 153,000,000 |  |  |  |  |  |
Deposits acquired |  |  |  | 136,000,000 |  |  |  |  |  |
Cash received from the FDIC |  | 29,899,000 |  | 30,000,000 |  |  |  |  |  |
Increase (decrease) in assets, fair value adjustments |  |  |  |  |  |  |  | (716,000) | (252,000) | 836,000
Number of shares of common stock for each share of acquireee's common stock (in shares) |  |  |  |  |  | 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 |  |  |  |
Net assets (liabilities) acquired |  | (29,899,000) |  |  |  |  |  |  |  |
Number of total offices after merger |  |  |  |  |  |  | 190 |  |  |
Number of states in which entity operates after merger (in states) |  |  |  |  |  |  | 8 |  |  |
Total assets after merger | 13,465,349,000 |  | 13,440,749,000 |  |  |  | 14,400,000,000 |  |  |
Total deposits after merger |  |  |  |  |  |  | $ 9,600,000,000 |  |  |
Percent of common stock holders voting in favor of merger |  |  |  |  | 82.00% |  |  |  |  |

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