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Financial Information - Washington Federal, Inc. - Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income                      
Total Income $ 157,152 $ 155,072 $ 149,079 $ 145,780 $ 142,240 $ 137,716 $ 136,198 $ 132,764 $ 607,083 $ 548,918 $ 536,793
Expense                      
Income before income taxes 67,341 64,494 64,773 60,635 66,969 65,351 62,791 61,105 257,243 256,216 248,134
Income tax benefit (expense) (15,826) (13,100) (15,502) (8,965) (20,865) (21,239) (20,721) (19,859) (53,393) (82,684) (84,085)
NET INCOME $ 51,515 $ 51,394 $ 49,271 $ 51,670 $ 46,104 $ 44,112 $ 42,070 $ 41,246 203,850 173,532 164,049
Parent Company                      
Income                      
Dividends from subsidiary                 198,294 171,500 148,000
Total Income                 198,294 171,500 148,000
Expense                      
Miscellaneous                 439 435 435
Total expense                 439 435 435
Net income (loss) before equity in undistributed net income (loss) of subsidiary                 197,855 171,065 147,565
Equity in undistributed net income (loss) of subsidiaries                 5,880 2,326 16,336
Income before income taxes                 203,735 173,391 163,901
Income tax benefit (expense)                 115 141 148
NET INCOME                 $ 203,850 $ 173,532 $ 164,049