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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

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