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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]
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