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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended
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%