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Condensed Financial Information - Parent Company Only: Condensed Statements of Operations, Parent Company (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
Operating income |  |  |  |  |  |  |  |  |  |  |
Interest on deposits in banks |  |  |  |  |  |  |  |  | $ 5,172 | $ 3,198 | $ 1,586
Operating expenses |  |  |  |  |  |  |  |  | 1,358 | 1,192 | 1,074
Income before income taxes and equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 29,921 | 22,422 | 21,243
Benefit for income taxes | $ 1,639 | $ 1,552 | $ 1,277 | $ 1,433 | $ 1,370 | $ 1,334 | $ 1,216 | $ 1,781 | 5,901 | 5,701 | 7,076
Net income | $ 6,335 | $ 5,956 | $ 6,114 | $ 5,615 | $ 4,422 | $ 4,416 | $ 4,269 | $ 3,614 | 24,020 | 16,721 | 14,167
Parent Company |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |
Interest on deposits in banks |  |  |  |  |  |  |  |  | 67 | 37 | 27
Interest on loan receivable from ESOP |  |  |  |  |  |  |  |  | 9 | 53 | 96
Dividends from Bank |  |  |  |  |  |  |  |  | 6,607 | 4,429 | 1,390
Total operating income |  |  |  |  |  |  |  |  | 6,683 | 4,519 | 1,513
Operating expenses |  |  |  |  |  |  |  |  | 525 | 591 | 467
Income before income taxes and equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 6,158 | 3,928 | 1,046
Benefit for income taxes |  |  |  |  |  |  |  |  | (169) | (198) | (385)
Income before undistributed income of Bank |  |  |  |  |  |  |  |  | 6,327 | 4,126 | 1,431
Equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 17,693 | 12,595 | 12,736
Net income |  |  |  |  |  |  |  |  | $ 24,020 | $ 16,721 | $ 14,167

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