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Condensed Financial Information - Parent Company Only: Condensed Statements of Cash Flows, 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
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,335 | $ 5,956 | $ 6,114 | $ 5,615 | $ 4,422 | $ 4,416 | $ 4,269 | $ 3,614 | $ 24,020 | $ 16,721 | $ 14,167
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock option compensation expense |  |  |  |  |  |  |  |  | 159 | 172 | 156
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 18,108 | 21,450 | 13,859
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Cash acquired, net of cash consideration paid in business combination |  |  |  |  |  |  |  |  | 14,284 | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | (44,547) | (68,269) | (20,163)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock warrant |  |  |  |  |  |  |  |  | 0 | 0 | 2,496
Repurchase of common stock |  |  |  |  |  |  |  |  | (499) | 0 | 0
Payment of dividends |  |  |  |  |  |  |  |  | (6,495) | (4,431) | (3,641)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 20,590 | 47,495 | 45,551
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (5,849) | 676 | 39,247
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  |  |  | 148,864 |  |  |  | 148,188 | 148,864 | 148,188 | 108,941
End of period | 143,015 |  |  |  | 148,864 |  |  |  | 143,015 | 148,864 | 148,188
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 24,020 | 16,721 | 14,167
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of Bank |  |  |  |  |  |  |  |  | (17,693) | (12,595) | (12,736)
Earned ESOP shares |  |  |  |  |  |  |  |  | 441 | 882 | 605
Stock option compensation expense |  |  |  |  |  |  |  |  | 159 | 172 | 156
Other, net |  |  |  |  |  |  |  |  | 9 | 280 | 33
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 6,936 | 5,460 | 2,225
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Investment in Bank |  |  |  |  |  |  |  |  | (14,915) | (1,271) | (930)
Principal repayments on loan receivable from ESOP |  |  |  |  |  |  |  |  | 285 | 536 | 493
Net cash used in investing activities |  |  |  |  |  |  |  |  | (346) | (735) | (437)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 401 | 318 | 332
Proceeds from exercise of stock warrant |  |  |  |  |  |  |  |  | 0 | 0 | 2,496
Repurchase of common stock |  |  |  |  |  |  |  |  | (499) | 0 | 0
Payment of dividends |  |  |  |  |  |  |  |  | (6,495) | (4,431) | (3,641)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (6,593) | (4,113) | (813)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (3) | 612 | 975
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  |  |  | $ 2,894 |  |  |  | $ 2,282 | 2,894 | 2,282 | 1,307
End of period | $ 2,891 |  |  |  | $ 2,894 |  |  |  | $ 2,891 | $ 2,894 | $ 2,282

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