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Financial Information - Washington Federal, INC. - Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income                      
Total Income $ 142,240 $ 137,716 $ 136,198 $ 132,764 $ 132,872 $ 133,735 $ 135,063 $ 135,124 $ 548,918 $ 536,793 $ 530,553
Expense                      
Income before income taxes 66,969 65,351 62,791 61,105 65,339 65,158 63,222 54,415 256,216 248,134 249,519
Income tax benefit (expense) (20,865) (21,239) (20,721) (19,859) (21,115) (22,154) (21,499) (19,317) (82,684) (84,085) (89,203)
NET INCOME $ 46,104 $ 44,112 $ 42,070 $ 41,246 $ 44,224 $ 43,004 $ 41,723 $ 35,098 173,532 164,049 160,316
Parent Company                      
Income                      
Dividends from subsidiary                 171,500 148,000 175,000
Total Income                 171,500 148,000 175,000
Expense                      
Miscellaneous                 435 435 439
Total expense                 435 435 439
Net income (loss) before equity in undistributed net income (loss) of subsidiary                 171,065 147,565 174,561
Equity in undistributed net income of subsidiary                 2,326 16,336 (14,402)
Income before income taxes                 173,391 163,901 160,159
Income tax benefit (expense)                 141 148 157
NET INCOME                 $ 173,532 $ 164,049 $ 160,316