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Financial Information - Washington Federal, Inc. - Statements of Financial Condition (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Assets        
Total assets $ 15,865,724 $ 15,253,580    
Liabilities        
Total liabilities 13,868,816 13,247,892    
Stockholders’ equity        
Total stockholders’ equity 1,996,908 2,005,688 $ 1,975,731 $ 1,955,679
Total liabilities and stockholders’ equity 15,865,724 15,253,580    
Parent Company        
Assets        
Cash 20,334 33,077    
Investment in subsidiary 1,980,062 1,972,675    
Total assets 2,000,396 2,005,752    
Liabilities        
Other liabilities 3,488 64    
Total liabilities 3,488 64    
Stockholders’ equity        
Total stockholders’ equity 1,996,908 2,005,688    
Total liabilities and stockholders’ equity $ 2,000,396 $ 2,005,752