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Financial Information - Washington Federal, INC. - Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income                      
Total Income $ 132,872 $ 133,735 $ 135,063 $ 135,124 $ 135,339 $ 129,300 $ 132,630 $ 132,741 $ 536,793 $ 530,553 $ 533,697
Expense                      
Income before income taxes 65,339 65,158 63,222 54,415 66,145 60,777 62,819 59,778 248,134 249,519 244,928
Income tax benefit (expense) (21,115) (22,154) (21,499) (19,317) (23,647) (21,727) (22,458) (21,371) (84,085) (89,203) (87,564)
NET INCOME $ 44,224 $ 43,004 $ 41,723 $ 35,098 $ 42,498 $ 39,050 $ 40,361 $ 38,407 164,049 160,316 157,364
Parent Company                      
Income                      
Dividends from subsidiary                 148,000 175,000 70,000
Total Income                 148,000 175,000 70,000
Expense                      
Miscellaneous                 435 439 485
Total expense                 435 439 485
Net income (loss) before equity in undistributed net income (loss) of subsidiary                 147,565 174,561 69,515
Equity in undistributed net income of subsidiary                 16,336 (14,402) 87,675
Income before income taxes                 163,901 160,159 157,190
Income tax benefit (expense)                 148 157 174
NET INCOME                 $ 164,049 $ 160,316 $ 157,364