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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

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