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Financial Information - Washington Federal, Inc. - Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income                      
Total Income $ 169,436 $ 171,826 $ 167,582 $ 162,622 $ 157,152 $ 155,072 $ 149,079 $ 145,780 $ 671,466 $ 607,083 $ 548,918
Expense                      
Income before income taxes 65,332 65,163 64,971 67,309 67,341 64,494 64,773 60,635 262,775 257,243 256,216
Income tax benefit (expense) (12,970) (11,309) (13,873) (14,367) (15,826) (13,100) (15,502) (8,965) (52,519) (53,393) (82,684)
Net income $ 52,362 $ 53,854 $ 51,098 $ 52,942 $ 51,515 $ 51,394 $ 49,271 $ 51,670 210,256 203,850 173,532
Parent Company                      
Income                      
Dividends from subsidiary                 208,389 198,294 171,500
Total Income                 208,389 198,294 171,500
Expense                      
Miscellaneous expense                 448 439 435
Total expense                 448 439 435
Net income (loss) before equity in undistributed net income (loss) of subsidiary                 207,941 197,855 171,065
Equity in undistributed net income (loss) of subsidiaries                 2,213 5,880 2,326
Income before income taxes                 210,154 203,735 173,391
Income tax benefit (expense)                 102 115 141
Net income                 $ 210,256 $ 203,850 $ 173,532