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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

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